/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

syntax = "proto3";
import "google/protobuf/descriptor.proto";

option java_package = "org.apache.arrow.flight.sql.impl";
package arrow.flight.protocol.sql;

/*
 * Represents a metadata request. Used in the command member of FlightDescriptor
 * for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  info_name: uint32 not null,
 *  value: dense_union<
 *              string_value: utf8,
 *              bool_value: bool,
 *              bigint_value: int64,
 *              int32_bitmask: int32,
 *              string_list: list<string_data: utf8>
 *              int32_to_int32_list_map: map<key: int32, value: list<$data$: int32>>
 * >
 * where there is one row per requested piece of metadata information.
 */
message CommandGetSqlInfo {
  option (experimental) = true;

  /*
   * Values are modelled after ODBC's SQLGetInfo() function. This information is intended to provide
   * Flight SQL clients with basic, SQL syntax and SQL functions related information.
   * More information types can be added in future releases.
   * E.g. more SQL syntax support types, scalar functions support, type conversion support etc.
   *
   * Note that the set of metadata may expand.
   *
   * Initially, Flight SQL will support the following information types:
   * - Server Information - Range [0-500)
   * - Syntax Information - Range [500-1000)
   * Range [0-10,000) is reserved for defaults (see SqlInfo enum for default options).
   * Custom options should start at 10,000.
   *
   * If omitted, then all metadata will be retrieved.
   * Flight SQL Servers may choose to include additional metadata above and beyond the specified set, however they must
   * at least return the specified set. IDs ranging from 0 to 10,000 (exclusive) are reserved for future use.
   * If additional metadata is included, the metadata IDs should start from 10,000.
   */
  repeated uint32 info = 1;
}

// Options for CommandGetSqlInfo.
enum SqlInfo {

  // Server Information [0-500): Provides basic information about the Flight SQL Server.

  // Retrieves a UTF-8 string with the name of the Flight SQL Server.
  FLIGHT_SQL_SERVER_NAME = 0;

  // Retrieves a UTF-8 string with the native version of the Flight SQL Server.
  FLIGHT_SQL_SERVER_VERSION = 1;

  // Retrieves a UTF-8 string with the Arrow format version of the Flight SQL Server.
  FLIGHT_SQL_SERVER_ARROW_VERSION = 2;

  /*
   * Retrieves a boolean value indicating whether the Flight SQL Server is read only.
   *
   * Returns:
   * - false: if read-write
   * - true: if read only
   */
  FLIGHT_SQL_SERVER_READ_ONLY = 3;


  // SQL Syntax Information [500-1000): provides information about SQL syntax supported by the Flight SQL Server.

  /*
   * Retrieves a boolean value indicating whether the Flight SQL Server supports CREATE and DROP of catalogs.
   *
   * Returns:
   * - false: if it doesn't support CREATE and DROP of catalogs.
   * - true: if it supports CREATE and DROP of catalogs.
   */
  SQL_DDL_CATALOG = 500;

  /*
   * Retrieves a boolean value indicating whether the Flight SQL Server supports CREATE and DROP of schemas.
   *
   * Returns:
   * - false: if it doesn't support CREATE and DROP of schemas.
   * - true: if it supports CREATE and DROP of schemas.
   */
  SQL_DDL_SCHEMA = 501;

  /*
   * Indicates whether the Flight SQL Server supports CREATE and DROP of tables.
   *
   * Returns:
   * - false: if it doesn't support CREATE and DROP of tables.
   * - true: if it supports CREATE and DROP of tables.
   */
  SQL_DDL_TABLE = 502;

  /*
   * Retrieves a int32 ordinal representing the case sensitivity of catalog, table, schema and table names.
   *
   * The possible values are listed in `arrow.flight.protocol.sql.SqlSupportedCaseSensitivity`.
   */
  SQL_IDENTIFIER_CASE = 503;

  // Retrieves a UTF-8 string with the supported character(s) used to surround a delimited identifier.
  SQL_IDENTIFIER_QUOTE_CHAR = 504;

  /*
   * Retrieves a int32 describing the case sensitivity of quoted identifiers.
   *
   * The possible values are listed in `arrow.flight.protocol.sql.SqlSupportedCaseSensitivity`.
   */
  SQL_QUOTED_IDENTIFIER_CASE = 505;

  /*
   * Retrieves a boolean value indicating whether all tables are selectable.
   *
   * Returns:
   * - false: if not all tables are selectable or if none are;
   * - true: if all tables are selectable.
   */
  SQL_ALL_TABLES_ARE_SELECTABLE = 506;

  /*
   * Retrieves the null ordering.
   *
   * Returns a int32 ordinal for the null ordering being used, as described in
   * `arrow.flight.protocol.sql.SqlNullOrdering`.
   */
  SQL_NULL_ORDERING = 507;

  // Retrieves a UTF-8 string list with values of the supported keywords.
  SQL_KEYWORDS = 508;

  // Retrieves a UTF-8 string list with values of the supported numeric functions.
  SQL_NUMERIC_FUNCTIONS = 509;

  // Retrieves a UTF-8 string list with values of the supported string functions.
  SQL_STRING_FUNCTIONS = 510;

  // Retrieves a UTF-8 string list with values of the supported system functions.
  SQL_SYSTEM_FUNCTIONS = 511;

  // Retrieves a UTF-8 string list with values of the supported datetime functions.
  SQL_DATETIME_FUNCTIONS = 512;

  /*
   * Retrieves the UTF-8 string that can be used to escape wildcard characters.
   * This is the string that can be used to escape '_' or '%' in the catalog search parameters that are a pattern
   * (and therefore use one of the wildcard characters).
   * The '_' character represents any single character; the '%' character represents any sequence of zero or more
   * characters.
   */
  SQL_SEARCH_STRING_ESCAPE = 513;

  /*
   * Retrieves a UTF-8 string with all the "extra" characters that can be used in unquoted identifier names
   * (those beyond a-z, A-Z, 0-9 and _).
   */
  SQL_EXTRA_NAME_CHARACTERS = 514;

  /*
   * Retrieves a boolean value indicating whether column aliasing is supported.
   * If so, the SQL AS clause can be used to provide names for computed columns or to provide alias names for columns
   * as required.
   *
   * Returns:
   * - false: if column aliasing is unsupported;
   * - true: if column aliasing is supported.
   */
  SQL_SUPPORTS_COLUMN_ALIASING = 515;

  /*
   * Retrieves a boolean value indicating whether concatenations between null and non-null values being
   * null are supported.
   *
   * - Returns:
   * - false: if concatenations between null and non-null values being null are unsupported;
   * - true: if concatenations between null and non-null values being null are supported.
   */
  SQL_NULL_PLUS_NULL_IS_NULL = 516;

  /*
   * Retrieves a map where the key is the type to convert from and the value is a list with the types to convert to,
   * indicating the supported conversions. Each key and each item on the list value is a value to a predefined type on
   * SqlSupportsConvert enum.
   * The returned map will be:  map<int32, list<int32>>
   */
  SQL_SUPPORTS_CONVERT = 517;

  /*
   * Retrieves a boolean value indicating whether, when table correlation names are supported,
   * they are restricted to being different from the names of the tables.
   *
   * Returns:
   * - false: if table correlation names are unsupported;
   * - true: if table correlation names are supported.
   */
  SQL_SUPPORTS_TABLE_CORRELATION_NAMES = 518;

  /*
   * Retrieves a boolean value indicating whether, when table correlation names are supported,
   * they are restricted to being different from the names of the tables.
   *
   * Returns:
   * - false: if different table correlation names are unsupported;
   * - true: if different table correlation names are supported
   */
  SQL_SUPPORTS_DIFFERENT_TABLE_CORRELATION_NAMES = 519;

  /*
   * Retrieves a boolean value indicating whether expressions in ORDER BY lists are supported.
   *
   * Returns:
   * - false: if expressions in ORDER BY are unsupported;
   * - true: if expressions in ORDER BY are supported;
   */
  SQL_SUPPORTS_EXPRESSIONS_IN_ORDER_BY = 520;

  /*
   * Retrieves a boolean value indicating whether using a column that is not in the SELECT statement in a GROUP BY
   * clause is supported.
   *
   * Returns:
   * - false: if using a column that is not in the SELECT statement in a GROUP BY clause is unsupported;
   * - true: if using a column that is not in the SELECT statement in a GROUP BY clause is supported.
   */
  SQL_SUPPORTS_ORDER_BY_UNRELATED = 521;

  /*
   * Retrieves the supported GROUP BY commands;
   *
   * Returns an int32 bitmask value representing the supported commands.
   * The returned bitmask should be parsed in order to retrieve the supported commands.
   *
   * For instance:
   * - return 0 (\b0)   => [] (GROUP BY is unsupported);
   * - return 1 (\b1)   => [SQL_GROUP_BY_UNRELATED];
   * - return 2 (\b10)  => [SQL_GROUP_BY_BEYOND_SELECT];
   * - return 3 (\b11)  => [SQL_GROUP_BY_UNRELATED, SQL_GROUP_BY_BEYOND_SELECT].
   * Valid GROUP BY types are described under `arrow.flight.protocol.sql.SqlSupportedGroupBy`.
   */
  SQL_SUPPORTED_GROUP_BY = 522;

  /*
   * Retrieves a boolean value indicating whether specifying a LIKE escape clause is supported.
   *
   * Returns:
   * - false: if specifying a LIKE escape clause is unsupported;
   * - true: if specifying a LIKE escape clause is supported.
   */
  SQL_SUPPORTS_LIKE_ESCAPE_CLAUSE = 523;

  /*
   * Retrieves a boolean value indicating whether columns may be defined as non-nullable.
   *
   * Returns:
   * - false: if columns cannot be defined as non-nullable;
   * - true: if columns may be defined as non-nullable.
   */
  SQL_SUPPORTS_NON_NULLABLE_COLUMNS = 524;

  /*
   * Retrieves the supported SQL grammar level as per the ODBC specification.
   *
   * Returns an int32 bitmask value representing the supported SQL grammar level.
   * The returned bitmask should be parsed in order to retrieve the supported grammar levels.
   *
   * For instance:
   * - return 0 (\b0)   => [] (SQL grammar is unsupported);
   * - return 1 (\b1)   => [SQL_MINIMUM_GRAMMAR];
   * - return 2 (\b10)  => [SQL_CORE_GRAMMAR];
   * - return 3 (\b11)  => [SQL_MINIMUM_GRAMMAR, SQL_CORE_GRAMMAR];
   * - return 4 (\b100) => [SQL_EXTENDED_GRAMMAR];
   * - return 5 (\b101) => [SQL_MINIMUM_GRAMMAR, SQL_EXTENDED_GRAMMAR];
   * - return 6 (\b110) => [SQL_CORE_GRAMMAR, SQL_EXTENDED_GRAMMAR];
   * - return 7 (\b111) => [SQL_MINIMUM_GRAMMAR, SQL_CORE_GRAMMAR, SQL_EXTENDED_GRAMMAR].
   * Valid SQL grammar levels are described under `arrow.flight.protocol.sql.SupportedSqlGrammar`.
   */
  SQL_SUPPORTED_GRAMMAR = 525;

  /*
   * Retrieves the supported ANSI92 SQL grammar level.
   *
   * Returns an int32 bitmask value representing the supported ANSI92 SQL grammar level.
   * The returned bitmask should be parsed in order to retrieve the supported commands.
   *
   * For instance:
   * - return 0 (\b0)   => [] (ANSI92 SQL grammar is unsupported);
   * - return 1 (\b1)   => [ANSI92_ENTRY_SQL];
   * - return 2 (\b10)  => [ANSI92_INTERMEDIATE_SQL];
   * - return 3 (\b11)  => [ANSI92_ENTRY_SQL, ANSI92_INTERMEDIATE_SQL];
   * - return 4 (\b100) => [ANSI92_FULL_SQL];
   * - return 5 (\b101) => [ANSI92_ENTRY_SQL, ANSI92_FULL_SQL];
   * - return 6 (\b110) => [ANSI92_INTERMEDIATE_SQL, ANSI92_FULL_SQL];
   * - return 7 (\b111) => [ANSI92_ENTRY_SQL, ANSI92_INTERMEDIATE_SQL, ANSI92_FULL_SQL].
   * Valid ANSI92 SQL grammar levels are described under `arrow.flight.protocol.sql.SupportedAnsi92SqlGrammarLevel`.
   */
  SQL_ANSI92_SUPPORTED_LEVEL = 526;

  /*
   * Retrieves a boolean value indicating whether the SQL Integrity Enhancement Facility is supported.
   *
   * Returns:
   * - false: if the SQL Integrity Enhancement Facility is supported;
   * - true: if the SQL Integrity Enhancement Facility is supported.
   */
  SQL_SUPPORTS_INTEGRITY_ENHANCEMENT_FACILITY = 527;

  /*
   * Retrieves the support level for SQL OUTER JOINs.
   *
   * Returns a int32 ordinal for the SQL ordering being used, as described in
   * `arrow.flight.protocol.sql.SqlOuterJoinsSupportLevel`.
   */
  SQL_OUTER_JOINS_SUPPORT_LEVEL = 528;

  // Retrieves a UTF-8 string with the preferred term for "schema".
  SQL_SCHEMA_TERM = 529;

  // Retrieves a UTF-8 string with the preferred term for "procedure".
  SQL_PROCEDURE_TERM = 530;

  // Retrieves a UTF-8 string with the preferred term for "catalog".
  SQL_CATALOG_TERM = 531;

  /*
   * Retrieves a boolean value indicating whether a catalog appears at the start of a fully qualified table name.
   *
   * - false: if a catalog does not appear at the start of a fully qualified table name;
   * - true: if a catalog appears at the start of a fully qualified table name.
   */
  SQL_CATALOG_AT_START = 532;

  /*
   * Retrieves the supported actions for a SQL schema.
   *
   * Returns an int32 bitmask value representing the supported actions for a SQL schema.
   * The returned bitmask should be parsed in order to retrieve the supported actions for a SQL schema.
   *
   * For instance:
   * - return 0 (\b0)   => [] (no supported actions for SQL schema);
   * - return 1 (\b1)   => [SQL_ELEMENT_IN_PROCEDURE_CALLS];
   * - return 2 (\b10)  => [SQL_ELEMENT_IN_INDEX_DEFINITIONS];
   * - return 3 (\b11)  => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_INDEX_DEFINITIONS];
   * - return 4 (\b100) => [SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
   * - return 5 (\b101) => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
   * - return 6 (\b110) => [SQL_ELEMENT_IN_INDEX_DEFINITIONS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
   * - return 7 (\b111) => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_INDEX_DEFINITIONS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS].
   * Valid actions for a SQL schema described under `arrow.flight.protocol.sql.SqlSupportedElementActions`.
   */
  SQL_SCHEMAS_SUPPORTED_ACTIONS = 533;

  /*
   * Retrieves the supported actions for a SQL schema.
   *
   * Returns an int32 bitmask value representing the supported actions for a SQL catalog.
   * The returned bitmask should be parsed in order to retrieve the supported actions for a SQL catalog.
   *
   * For instance:
   * - return 0 (\b0)   => [] (no supported actions for SQL catalog);
   * - return 1 (\b1)   => [SQL_ELEMENT_IN_PROCEDURE_CALLS];
   * - return 2 (\b10)  => [SQL_ELEMENT_IN_INDEX_DEFINITIONS];
   * - return 3 (\b11)  => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_INDEX_DEFINITIONS];
   * - return 4 (\b100) => [SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
   * - return 5 (\b101) => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
   * - return 6 (\b110) => [SQL_ELEMENT_IN_INDEX_DEFINITIONS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS];
   * - return 7 (\b111) => [SQL_ELEMENT_IN_PROCEDURE_CALLS, SQL_ELEMENT_IN_INDEX_DEFINITIONS, SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS].
   * Valid actions for a SQL catalog are described under `arrow.flight.protocol.sql.SqlSupportedElementActions`.
   */
  SQL_CATALOGS_SUPPORTED_ACTIONS = 534;

  /*
   * Retrieves the supported SQL positioned commands.
   *
   * Returns an int32 bitmask value representing the supported SQL positioned commands.
   * The returned bitmask should be parsed in order to retrieve the supported SQL positioned commands.
   *
   * For instance:
   * - return 0 (\b0)   => [] (no supported SQL positioned commands);
   * - return 1 (\b1)   => [SQL_POSITIONED_DELETE];
   * - return 2 (\b10)  => [SQL_POSITIONED_UPDATE];
   * - return 3 (\b11)  => [SQL_POSITIONED_DELETE, SQL_POSITIONED_UPDATE].
   * Valid SQL positioned commands are described under `arrow.flight.protocol.sql.SqlSupportedPositionedCommands`.
   */
  SQL_SUPPORTED_POSITIONED_COMMANDS = 535;

  /*
   * Retrieves a boolean value indicating whether SELECT FOR UPDATE statements are supported.
   *
   * Returns:
   * - false: if SELECT FOR UPDATE statements are unsupported;
   * - true: if SELECT FOR UPDATE statements are supported.
   */
  SQL_SELECT_FOR_UPDATE_SUPPORTED = 536;

  /*
   * Retrieves a boolean value indicating whether stored procedure calls that use the stored procedure escape syntax
   * are supported.
   *
   * Returns:
   * - false: if stored procedure calls that use the stored procedure escape syntax are unsupported;
   * - true: if stored procedure calls that use the stored procedure escape syntax are supported.
   */
  SQL_STORED_PROCEDURES_SUPPORTED = 537;

  /*
   * Retrieves the supported SQL subqueries.
   *
   * Returns an int32 bitmask value representing the supported SQL subqueries.
   * The returned bitmask should be parsed in order to retrieve the supported SQL subqueries.
   *
   * For instance:
   * - return 0   (\b0)     => [] (no supported SQL subqueries);
   * - return 1   (\b1)     => [SQL_SUBQUERIES_IN_COMPARISONS];
   * - return 2   (\b10)    => [SQL_SUBQUERIES_IN_EXISTS];
   * - return 3   (\b11)    => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_EXISTS];
   * - return 4   (\b100)   => [SQL_SUBQUERIES_IN_INS];
   * - return 5   (\b101)   => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_INS];
   * - return 6   (\b110)   => [SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_EXISTS];
   * - return 7   (\b111)   => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_INS];
   * - return 8   (\b1000)  => [SQL_SUBQUERIES_IN_QUANTIFIEDS];
   * - return 9   (\b1001)  => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
   * - return 10  (\b1010)  => [SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
   * - return 11  (\b1011)  => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
   * - return 12  (\b1100)  => [SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
   * - return 13  (\b1101)  => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
   * - return 14  (\b1110)  => [SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
   * - return 15  (\b1111)  => [SQL_SUBQUERIES_IN_COMPARISONS, SQL_SUBQUERIES_IN_EXISTS, SQL_SUBQUERIES_IN_INS, SQL_SUBQUERIES_IN_QUANTIFIEDS];
   * - ...
   * Valid SQL subqueries are described under `arrow.flight.protocol.sql.SqlSupportedSubqueries`.
   */
  SQL_SUPPORTED_SUBQUERIES = 538;

  /*
   * Retrieves a boolean value indicating whether correlated subqueries are supported.
   *
   * Returns:
   * - false: if correlated subqueries are unsupported;
   * - true: if correlated subqueries are supported.
   */
  SQL_CORRELATED_SUBQUERIES_SUPPORTED = 539;

  /*
   * Retrieves the supported SQL UNIONs.
   *
   * Returns an int32 bitmask value representing the supported SQL UNIONs.
   * The returned bitmask should be parsed in order to retrieve the supported SQL UNIONs.
   *
   * For instance:
   * - return 0 (\b0)   => [] (no supported SQL positioned commands);
   * - return 1 (\b1)   => [SQL_UNION];
   * - return 2 (\b10)  => [SQL_UNION_ALL];
   * - return 3 (\b11)  => [SQL_UNION, SQL_UNION_ALL].
   * Valid SQL positioned commands are described under `arrow.flight.protocol.sql.SqlSupportedUnions`.
   */
  SQL_SUPPORTED_UNIONS = 540;

  // Retrieves a int64 value representing the maximum number of hex characters allowed in an inline binary literal.
  SQL_MAX_BINARY_LITERAL_LENGTH = 541;

  // Retrieves a int64 value representing the maximum number of characters allowed for a character literal.
  SQL_MAX_CHAR_LITERAL_LENGTH = 542;

  // Retrieves a int64 value representing the maximum number of characters allowed for a column name.
  SQL_MAX_COLUMN_NAME_LENGTH = 543;

  // Retrieves a int64 value representing the the maximum number of columns allowed in a GROUP BY clause.
  SQL_MAX_COLUMNS_IN_GROUP_BY = 544;

  // Retrieves a int64 value representing the maximum number of columns allowed in an index.
  SQL_MAX_COLUMNS_IN_INDEX = 545;

  // Retrieves a int64 value representing the maximum number of columns allowed in an ORDER BY clause.
  SQL_MAX_COLUMNS_IN_ORDER_BY = 546;

  // Retrieves a int64 value representing the maximum number of columns allowed in a SELECT list.
  SQL_MAX_COLUMNS_IN_SELECT = 547;

  // Retrieves a int64 value representing the maximum number of columns allowed in a table.
  SQL_MAX_COLUMNS_IN_TABLE = 548;

  // Retrieves a int64 value representing the maximum number of concurrent connections possible.
  SQL_MAX_CONNECTIONS = 549;

  // Retrieves a int64 value the maximum number of characters allowed in a cursor name.
  SQL_MAX_CURSOR_NAME_LENGTH = 550;

  /*
   * Retrieves a int64 value representing the maximum number of bytes allowed for an index,
   * including all of the parts of the index.
   */
  SQL_MAX_INDEX_LENGTH = 551;

  // Retrieves a int64 value representing the maximum number of characters allowed in a schema name.
  SQL_DB_SCHEMA_NAME_LENGTH = 552;

  // Retrieves a int64 value representing the maximum number of characters allowed in a procedure name.
  SQL_MAX_PROCEDURE_NAME_LENGTH = 553;

  // Retrieves a int64 value representing the maximum number of characters allowed in a catalog name.
  SQL_MAX_CATALOG_NAME_LENGTH = 554;

  // Retrieves a int64 value representing the maximum number of bytes allowed in a single row.
  SQL_MAX_ROW_SIZE = 555;

  /*
   * Retrieves a boolean indicating whether the return value for the JDBC method getMaxRowSize includes the SQL
   * data types LONGVARCHAR and LONGVARBINARY.
   *
   * Returns:
   * - false: if return value for the JDBC method getMaxRowSize does
   *          not include the SQL data types LONGVARCHAR and LONGVARBINARY;
   * - true: if return value for the JDBC method getMaxRowSize includes
   *         the SQL data types LONGVARCHAR and LONGVARBINARY.
   */
  SQL_MAX_ROW_SIZE_INCLUDES_BLOBS = 556;

  /*
   * Retrieves a int64 value representing the maximum number of characters allowed for an SQL statement;
   * a result of 0 (zero) means that there is no limit or the limit is not known.
   */
  SQL_MAX_STATEMENT_LENGTH = 557;

  // Retrieves a int64 value representing the maximum number of active statements that can be open at the same time.
  SQL_MAX_STATEMENTS = 558;

  // Retrieves a int64 value representing the maximum number of characters allowed in a table name.
  SQL_MAX_TABLE_NAME_LENGTH = 559;

  // Retrieves a int64 value representing the maximum number of tables allowed in a SELECT statement.
  SQL_MAX_TABLES_IN_SELECT = 560;

  // Retrieves a int64 value representing the maximum number of characters allowed in a user name.
  SQL_MAX_USERNAME_LENGTH = 561;

  /*
   * Retrieves this database's default transaction isolation level as described in
   * `arrow.flight.protocol.sql.SqlTransactionIsolationLevel`.
   *
   * Returns a int32 ordinal for the SQL transaction isolation level.
   */
  SQL_DEFAULT_TRANSACTION_ISOLATION = 562;

  /*
   * Retrieves a boolean value indicating whether transactions are supported. If not, invoking the method commit is a
   * noop, and the isolation level is `arrow.flight.protocol.sql.SqlTransactionIsolationLevel.TRANSACTION_NONE`.
   *
   * Returns:
   * - false: if transactions are unsupported;
   * - true: if transactions are supported.
   */
  SQL_TRANSACTIONS_SUPPORTED = 563;

  /*
   * Retrieves the supported transactions isolation levels.
   *
   * Returns an int32 bitmask value representing the supported transactions isolation levels.
   * The returned bitmask should be parsed in order to retrieve the supported transactions isolation levels.
   *
   * For instance:
   * - return 0   (\b0)     => [] (no supported SQL transactions isolation levels);
   * - return 1   (\b1)     => [SQL_TRANSACTION_NONE];
   * - return 2   (\b10)    => [SQL_TRANSACTION_READ_UNCOMMITTED];
   * - return 3   (\b11)    => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_READ_UNCOMMITTED];
   * - return 4   (\b100)   => [SQL_TRANSACTION_REPEATABLE_READ];
   * - return 5   (\b101)   => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 6   (\b110)   => [SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 7   (\b111)   => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 8   (\b1000)  => [SQL_TRANSACTION_REPEATABLE_READ];
   * - return 9   (\b1001)  => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 10  (\b1010)  => [SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 11  (\b1011)  => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 12  (\b1100)  => [SQL_TRANSACTION_REPEATABLE_READ, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 13  (\b1101)  => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_REPEATABLE_READ, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 14  (\b1110)  => [SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 15  (\b1111)  => [SQL_TRANSACTION_NONE, SQL_TRANSACTION_READ_UNCOMMITTED, SQL_TRANSACTION_REPEATABLE_READ, SQL_TRANSACTION_REPEATABLE_READ];
   * - return 16  (\b10000) => [SQL_TRANSACTION_SERIALIZABLE];
   * - ...
   * Valid SQL positioned commands are described under `arrow.flight.protocol.sql.SqlTransactionIsolationLevel`.
   */
  SQL_SUPPORTED_TRANSACTIONS_ISOLATION_LEVELS = 564;

  /*
   * Retrieves a boolean value indicating whether a data definition statement within a transaction forces
   * the transaction to commit.
   *
   * Returns:
   * - false: if a data definition statement within a transaction does not force the transaction to commit;
   * - true: if a data definition statement within a transaction forces the transaction to commit.
   */
  SQL_DATA_DEFINITION_CAUSES_TRANSACTION_COMMIT = 565;

  /*
   * Retrieves a boolean value indicating whether a data definition statement within a transaction is ignored.
   *
   * Returns:
   * - false: if a data definition statement within a transaction is taken into account;
   * - true: a data definition statement within a transaction is ignored.
   */
  SQL_DATA_DEFINITIONS_IN_TRANSACTIONS_IGNORED = 566;

  /*
   * Retrieves an int32 bitmask value representing the supported result set types.
   * The returned bitmask should be parsed in order to retrieve the supported result set types.
   *
   * For instance:
   * - return 0   (\b0)     => [] (no supported result set types);
   * - return 1   (\b1)     => [SQL_RESULT_SET_TYPE_UNSPECIFIED];
   * - return 2   (\b10)    => [SQL_RESULT_SET_TYPE_FORWARD_ONLY];
   * - return 3   (\b11)    => [SQL_RESULT_SET_TYPE_UNSPECIFIED, SQL_RESULT_SET_TYPE_FORWARD_ONLY];
   * - return 4   (\b100)   => [SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE];
   * - return 5   (\b101)   => [SQL_RESULT_SET_TYPE_UNSPECIFIED, SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE];
   * - return 6   (\b110)   => [SQL_RESULT_SET_TYPE_FORWARD_ONLY, SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE];
   * - return 7   (\b111)   => [SQL_RESULT_SET_TYPE_UNSPECIFIED, SQL_RESULT_SET_TYPE_FORWARD_ONLY, SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE];
   * - return 8   (\b1000)  => [SQL_RESULT_SET_TYPE_SCROLL_SENSITIVE];
   * - ...
   * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetType`.
   */
  SQL_SUPPORTED_RESULT_SET_TYPES = 567;

  /*
   * Returns an int32 bitmask value concurrency types supported for
   * `arrow.flight.protocol.sql.SqlSupportedResultSetType.SQL_RESULT_SET_TYPE_UNSPECIFIED`.
   *
   * For instance:
   * - return 0 (\b0)   => [] (no supported concurrency types for this result set type)
   * - return 1 (\b1)   => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED]
   * - return 2 (\b10)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
   * - return 3 (\b11)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
   * - return 4 (\b100) => [SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 5 (\b101) => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 6 (\b110)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 7 (\b111)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetConcurrency`.
   */
  SQL_SUPPORTED_CONCURRENCIES_FOR_RESULT_SET_UNSPECIFIED = 568;

  /*
   * Returns an int32 bitmask value concurrency types supported for
   * `arrow.flight.protocol.sql.SqlSupportedResultSetType.SQL_RESULT_SET_TYPE_FORWARD_ONLY`.
   *
   * For instance:
   * - return 0 (\b0)   => [] (no supported concurrency types for this result set type)
   * - return 1 (\b1)   => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED]
   * - return 2 (\b10)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
   * - return 3 (\b11)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
   * - return 4 (\b100) => [SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 5 (\b101) => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 6 (\b110)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 7 (\b111)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetConcurrency`.
   */
  SQL_SUPPORTED_CONCURRENCIES_FOR_RESULT_SET_FORWARD_ONLY = 569;

  /*
   * Returns an int32 bitmask value concurrency types supported for
   * `arrow.flight.protocol.sql.SqlSupportedResultSetType.SQL_RESULT_SET_TYPE_SCROLL_SENSITIVE`.
   *
   * For instance:
   * - return 0 (\b0)   => [] (no supported concurrency types for this result set type)
   * - return 1 (\b1)   => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED]
   * - return 2 (\b10)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
   * - return 3 (\b11)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
   * - return 4 (\b100) => [SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 5 (\b101) => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 6 (\b110)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 7 (\b111)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetConcurrency`.
   */
  SQL_SUPPORTED_CONCURRENCIES_FOR_RESULT_SET_SCROLL_SENSITIVE = 570;

  /*
   * Returns an int32 bitmask value concurrency types supported for
   * `arrow.flight.protocol.sql.SqlSupportedResultSetType.SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE`.
   *
   * For instance:
   * - return 0 (\b0)   => [] (no supported concurrency types for this result set type)
   * - return 1 (\b1)   => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED]
   * - return 2 (\b10)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
   * - return 3 (\b11)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY]
   * - return 4 (\b100) => [SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 5 (\b101) => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 6 (\b110)  => [SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * - return 7 (\b111)  => [SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED, SQL_RESULT_SET_CONCURRENCY_READ_ONLY, SQL_RESULT_SET_CONCURRENCY_UPDATABLE]
   * Valid result set types are described under `arrow.flight.protocol.sql.SqlSupportedResultSetConcurrency`.
   */
  SQL_SUPPORTED_CONCURRENCIES_FOR_RESULT_SET_SCROLL_INSENSITIVE = 571;

  /*
   * Retrieves a boolean value indicating whether this database supports batch updates.
   *
   * - false: if this database does not support batch updates;
   * - true: if this database supports batch updates.
   */
  SQL_BATCH_UPDATES_SUPPORTED = 572;

  /*
   * Retrieves a boolean value indicating whether this database supports savepoints.
   *
   * Returns:
   * - false: if this database does not support savepoints;
   * - true: if this database supports savepoints.
   */
  SQL_SAVEPOINTS_SUPPORTED = 573;

  /*
   * Retrieves a boolean value indicating whether named parameters are supported in callable statements.
   *
   * Returns:
   * - false: if named parameters in callable statements are unsupported;
   * - true: if named parameters in callable statements are supported.
   */
  SQL_NAMED_PARAMETERS_SUPPORTED = 574;

  /*
   * Retrieves a boolean value indicating whether updates made to a LOB are made on a copy or directly to the LOB.
   *
   * Returns:
   * - false: if updates made to a LOB are made directly to the LOB;
   * - true: if updates made to a LOB are made on a copy.
   */
  SQL_LOCATORS_UPDATE_COPY = 575;

  /*
   * Retrieves a boolean value indicating whether invoking user-defined or vendor functions
   * using the stored procedure escape syntax is supported.
   *
   * Returns:
   * - false: if invoking user-defined or vendor functions using the stored procedure escape syntax is unsupported;
   * - true: if invoking user-defined or vendor functions using the stored procedure escape syntax is supported.
   */
  SQL_STORED_FUNCTIONS_USING_CALL_SYNTAX_SUPPORTED = 576;
}

enum SqlSupportedCaseSensitivity {
  SQL_CASE_SENSITIVITY_UNKNOWN = 0;
  SQL_CASE_SENSITIVITY_CASE_INSENSITIVE = 1;
  SQL_CASE_SENSITIVITY_UPPERCASE = 2;
  SQL_CASE_SENSITIVITY_LOWERCASE = 3;
}

enum SqlNullOrdering {
  SQL_NULLS_SORTED_HIGH = 0;
  SQL_NULLS_SORTED_LOW = 1;
  SQL_NULLS_SORTED_AT_START = 2;
  SQL_NULLS_SORTED_AT_END = 3;
}

enum SupportedSqlGrammar {
  SQL_MINIMUM_GRAMMAR = 0;
  SQL_CORE_GRAMMAR = 1;
  SQL_EXTENDED_GRAMMAR = 2;
}

enum SupportedAnsi92SqlGrammarLevel {
  ANSI92_ENTRY_SQL = 0;
  ANSI92_INTERMEDIATE_SQL = 1;
  ANSI92_FULL_SQL = 2;
}

enum SqlOuterJoinsSupportLevel {
  SQL_JOINS_UNSUPPORTED = 0;
  SQL_LIMITED_OUTER_JOINS = 1;
  SQL_FULL_OUTER_JOINS = 2;
}

enum SqlSupportedGroupBy {
  SQL_GROUP_BY_UNRELATED = 0;
  SQL_GROUP_BY_BEYOND_SELECT = 1;
}

enum SqlSupportedElementActions {
  SQL_ELEMENT_IN_PROCEDURE_CALLS = 0;
  SQL_ELEMENT_IN_INDEX_DEFINITIONS = 1;
  SQL_ELEMENT_IN_PRIVILEGE_DEFINITIONS = 2;
}

enum SqlSupportedPositionedCommands {
  SQL_POSITIONED_DELETE = 0;
  SQL_POSITIONED_UPDATE = 1;
}

enum SqlSupportedSubqueries {
  SQL_SUBQUERIES_IN_COMPARISONS = 0;
  SQL_SUBQUERIES_IN_EXISTS = 1;
  SQL_SUBQUERIES_IN_INS = 2;
  SQL_SUBQUERIES_IN_QUANTIFIEDS = 3;
}

enum SqlSupportedUnions {
  SQL_UNION = 0;
  SQL_UNION_ALL = 1;
}

enum SqlTransactionIsolationLevel {
  SQL_TRANSACTION_NONE = 0;
  SQL_TRANSACTION_READ_UNCOMMITTED = 1;
  SQL_TRANSACTION_READ_COMMITTED = 2;
  SQL_TRANSACTION_REPEATABLE_READ = 3;
  SQL_TRANSACTION_SERIALIZABLE = 4;
}

enum SqlSupportedTransactions {
  SQL_TRANSACTION_UNSPECIFIED = 0;
  SQL_DATA_DEFINITION_TRANSACTIONS = 1;
  SQL_DATA_MANIPULATION_TRANSACTIONS = 2;
}

enum SqlSupportedResultSetType {
  SQL_RESULT_SET_TYPE_UNSPECIFIED = 0;
  SQL_RESULT_SET_TYPE_FORWARD_ONLY = 1;
  SQL_RESULT_SET_TYPE_SCROLL_INSENSITIVE = 2;
  SQL_RESULT_SET_TYPE_SCROLL_SENSITIVE = 3;
}

enum SqlSupportedResultSetConcurrency {
  SQL_RESULT_SET_CONCURRENCY_UNSPECIFIED = 0;
  SQL_RESULT_SET_CONCURRENCY_READ_ONLY = 1;
  SQL_RESULT_SET_CONCURRENCY_UPDATABLE = 2;
}

enum SqlSupportsConvert {
  SQL_CONVERT_BIGINT = 0;
  SQL_CONVERT_BINARY = 1;
  SQL_CONVERT_BIT = 2;
  SQL_CONVERT_CHAR = 3;
  SQL_CONVERT_DATE = 4;
  SQL_CONVERT_DECIMAL = 5;
  SQL_CONVERT_FLOAT = 6;
  SQL_CONVERT_INTEGER = 7;
  SQL_CONVERT_INTERVAL_DAY_TIME = 8;
  SQL_CONVERT_INTERVAL_YEAR_MONTH = 9;
  SQL_CONVERT_LONGVARBINARY = 10;
  SQL_CONVERT_LONGVARCHAR = 11;
  SQL_CONVERT_NUMERIC = 12;
  SQL_CONVERT_REAL = 13;
  SQL_CONVERT_SMALLINT = 14;
  SQL_CONVERT_TIME = 15;
  SQL_CONVERT_TIMESTAMP = 16;
  SQL_CONVERT_TINYINT = 17;
  SQL_CONVERT_VARBINARY = 18;
  SQL_CONVERT_VARCHAR = 19;
}

/**
 * The JDBC/ODBC-defined type of any object.
 * All the values here are the sames as in the JDBC and ODBC specs.
 */
enum XdbcDataType {
  XDBC_UNKNOWN_TYPE = 0;
  XDBC_CHAR = 1;
  XDBC_NUMERIC = 2;
  XDBC_DECIMAL = 3;
  XDBC_INTEGER = 4;
  XDBC_SMALLINT = 5;
  XDBC_FLOAT = 6;
  XDBC_REAL = 7;
  XDBC_DOUBLE = 8;
  XDBC_DATETIME = 9;
  XDBC_INTERVAL = 10;
  XDBC_VARCHAR = 12;
  XDBC_DATE = 91;
  XDBC_TIME = 92;
  XDBC_TIMESTAMP = 93;
  XDBC_LONGVARCHAR = -1;
  XDBC_BINARY = -2;
  XDBC_VARBINARY = -3;
  XDBC_LONGVARBINARY = -4;
  XDBC_BIGINT = -5;
  XDBC_TINYINT = -6;
  XDBC_BIT = -7;
  XDBC_WCHAR = -8;
  XDBC_WVARCHAR = -9;
}

/**
 * Detailed subtype information for XDBC_TYPE_DATETIME and XDBC_TYPE_INTERVAL.
 */
enum XdbcDatetimeSubcode {
  option allow_alias = true;
  XDBC_SUBCODE_UNKNOWN = 0;
  XDBC_SUBCODE_YEAR = 1;
  XDBC_SUBCODE_DATE = 1;
  XDBC_SUBCODE_TIME = 2;
  XDBC_SUBCODE_MONTH = 2;
  XDBC_SUBCODE_TIMESTAMP = 3;
  XDBC_SUBCODE_DAY = 3;
  XDBC_SUBCODE_TIME_WITH_TIMEZONE = 4;
  XDBC_SUBCODE_HOUR = 4;
  XDBC_SUBCODE_TIMESTAMP_WITH_TIMEZONE = 5;
  XDBC_SUBCODE_MINUTE = 5;
  XDBC_SUBCODE_SECOND = 6;
  XDBC_SUBCODE_YEAR_TO_MONTH = 7;
  XDBC_SUBCODE_DAY_TO_HOUR = 8;
  XDBC_SUBCODE_DAY_TO_MINUTE = 9;
  XDBC_SUBCODE_DAY_TO_SECOND = 10;
  XDBC_SUBCODE_HOUR_TO_MINUTE = 11;
  XDBC_SUBCODE_HOUR_TO_SECOND = 12;
  XDBC_SUBCODE_MINUTE_TO_SECOND = 13;
  XDBC_SUBCODE_INTERVAL_YEAR = 101;
  XDBC_SUBCODE_INTERVAL_MONTH = 102;
  XDBC_SUBCODE_INTERVAL_DAY = 103;
  XDBC_SUBCODE_INTERVAL_HOUR = 104;
  XDBC_SUBCODE_INTERVAL_MINUTE = 105;
  XDBC_SUBCODE_INTERVAL_SECOND = 106;
  XDBC_SUBCODE_INTERVAL_YEAR_TO_MONTH = 107;
  XDBC_SUBCODE_INTERVAL_DAY_TO_HOUR = 108;
  XDBC_SUBCODE_INTERVAL_DAY_TO_MINUTE = 109;
  XDBC_SUBCODE_INTERVAL_DAY_TO_SECOND = 110;
  XDBC_SUBCODE_INTERVAL_HOUR_TO_MINUTE = 111;
  XDBC_SUBCODE_INTERVAL_HOUR_TO_SECOND = 112;
  XDBC_SUBCODE_INTERVAL_MINUTE_TO_SECOND = 113;
}

enum Nullable {
  /**
   * Indicates that the fields does not allow the use of null values.
   */
  NULLABILITY_NO_NULLS = 0;

  /**
   * Indicates that the fields allow the use of null values.
   */
  NULLABILITY_NULLABLE = 1;

  /**
   * Indicates that nullability of the fields can not be determined.
   */
  NULLABILITY_UNKNOWN = 2;
}

enum Searchable {
  /**
   * Indicates that column can not be used in a WHERE clause.
   */
  SEARCHABLE_NONE = 0;

  /**
   * Indicates that the column can be used in a WHERE clause if it is using a
   * LIKE operator.
   */
  SEARCHABLE_CHAR = 1;

  /**
   * Indicates that the column can be used In a WHERE clause with any
   * operator other than LIKE.
   *
   * - Allowed operators: comparison, quantified comparison, BETWEEN,
   *                      DISTINCT, IN, MATCH, and UNIQUE.
   */
  SEARCHABLE_BASIC = 2;

  /**
   * Indicates that the column can be used in a WHERE clause using any operator.
   */
  SEARCHABLE_FULL = 3;
}

/*
 * Represents a request to retrieve information about data type supported on a Flight SQL enabled backend.
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned schema will be:
 * <
 *   type_name: utf8 not null (The name of the data type, for example: VARCHAR, INTEGER, etc),
 *   data_type: int not null (The SQL data type),
 *   column_size: int (The maximum size supported by that column.
 *                     In case of exact numeric types, this represents the maximum precision.
 *                     In case of string types, this represents the character length.
 *                     In case of datetime data types, this represents the length in characters of the string representation.
 *                     NULL is returned for data types where column size is not applicable.),
 *   literal_prefix: utf8 (Character or characters used to prefix a literal, NULL is returned for
 *                         data types where a literal prefix is not applicable.),
 *   literal_suffix: utf8 (Character or characters used to terminate a literal,
 *                         NULL is returned for data types where a literal suffix is not applicable.),
 *   create_params: list<utf8 not null>
 *                        (A list of keywords corresponding to which parameters can be used when creating
 *                         a column for that specific type.
 *                         NULL is returned if there are no parameters for the data type definition.),
 *   nullable: int not null (Shows if the data type accepts a NULL value. The possible values can be seen in the
 *                           Nullable enum.),
 *   case_sensitive: bool not null (Shows if a character data type is case-sensitive in collations and comparisons),
 *   searchable: int not null (Shows how the data type is used in a WHERE clause. The possible values can be seen in the
 *                             Searchable enum.),
 *   unsigned_attribute: bool (Shows if the data type is unsigned. NULL is returned if the attribute is
 *                             not applicable to the data type or the data type is not numeric.),
 *   fixed_prec_scale: bool not null (Shows if the data type has predefined fixed precision and scale.),
 *   auto_increment: bool (Shows if the data type is auto incremental. NULL is returned if the attribute
 *                         is not applicable to the data type or the data type is not numeric.),
 *   local_type_name: utf8 (Localized version of the data source-dependent name of the data type. NULL
 *                          is returned if a localized name is not supported by the data source),
 *   minimum_scale: int (The minimum scale of the data type on the data source.
 *                       If a data type has a fixed scale, the MINIMUM_SCALE and MAXIMUM_SCALE
 *                       columns both contain this value. NULL is returned if scale is not applicable.),
 *   maximum_scale: int (The maximum scale of the data type on the data source.
 *                       NULL is returned if scale is not applicable.),
 *   sql_data_type: int not null (The value of the SQL DATA TYPE which has the same values
 *                                as data_type value. Except for interval and datetime, which
 *                                uses generic values. More info about those types can be
 *                                obtained through datetime_subcode. The possible values can be seen
 *                                in the XdbcDataType enum.),
 *   datetime_subcode: int (Only used when the SQL DATA TYPE is interval or datetime. It contains
 *                          its sub types. For type different from interval and datetime, this value
 *                          is NULL. The possible values can be seen in the XdbcDatetimeSubcode enum.),
 *   num_prec_radix: int (If the data type is an approximate numeric type, this column contains
 *                        the value 2 to indicate that COLUMN_SIZE specifies a number of bits. For
 *                        exact numeric types, this column contains the value 10 to indicate that
 *                        column size specifies a number of decimal digits. Otherwise, this column is NULL.),
 *   interval_precision: int (If the data type is an interval data type, then this column contains the value
 *                            of the interval leading precision. Otherwise, this column is NULL. This fields
 *                            is only relevant to be used by ODBC).
 * >
 * The returned data should be ordered by data_type and then by type_name.
 */
message CommandGetXdbcTypeInfo {
  option (experimental) = true;

  /*
   * Specifies the data type to search for the info.
   */
  optional int32 data_type = 1;
}

/*
 * Represents a request to retrieve the list of catalogs on a Flight SQL enabled backend.
 * The definition of a catalog depends on vendor/implementation. It is usually the database itself
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  catalog_name: utf8 not null
 * >
 * The returned data should be ordered by catalog_name.
 */
message CommandGetCatalogs {
  option (experimental) = true;
}

/*
 * Represents a request to retrieve the list of database schemas on a Flight SQL enabled backend.
 * The definition of a database schema depends on vendor/implementation. It is usually a collection of tables.
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  catalog_name: utf8,
 *  db_schema_name: utf8 not null
 * >
 * The returned data should be ordered by catalog_name, then db_schema_name.
 */
message CommandGetDbSchemas {
  option (experimental) = true;

  /*
   * Specifies the Catalog to search for the tables.
   * An empty string retrieves those without a catalog.
   * If omitted the catalog name should not be used to narrow the search.
   */
  optional string catalog = 1;

  /*
   * Specifies a filter pattern for schemas to search for.
   * When no db_schema_filter_pattern is provided, the pattern will not be used to narrow the search.
   * In the pattern string, two special characters can be used to denote matching rules:
   *    - "%" means to match any substring with 0 or more characters.
   *    - "_" means to match any one character.
   */
  optional string db_schema_filter_pattern = 2;
}

/*
 * Represents a request to retrieve the list of tables, and optionally their schemas, on a Flight SQL enabled backend.
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  catalog_name: utf8,
 *  db_schema_name: utf8,
 *  table_name: utf8 not null,
 *  table_type: utf8 not null,
 *  [optional] table_schema: bytes not null (schema of the table as described in Schema.fbs::Schema,
 *                                           it is serialized as an IPC message.)
 * >
 * Fields on table_schema may contain the following metadata:
 *  - ARROW:FLIGHT:SQL:CATALOG_NAME      - Table's catalog name
 *  - ARROW:FLIGHT:SQL:DB_SCHEMA_NAME    - Database schema name
 *  - ARROW:FLIGHT:SQL:TABLE_NAME        - Table name
 *  - ARROW:FLIGHT:SQL:PRECISION         - Column precision/size
 *  - ARROW:FLIGHT:SQL:SCALE             - Column scale/decimal digits if applicable
 *  - ARROW:FLIGHT:SQL:IS_AUTO_INCREMENT - "1" indicates if the column is auto incremented, "0" otherwise.
 *  - ARROW:FLIGHT:SQL:IS_CASE_SENSITIVE - "1" indicates if the column is case sensitive, "0" otherwise.
 *  - ARROW:FLIGHT:SQL:IS_READ_ONLY      - "1" indicates if the column is read only, "0" otherwise.
 *  - ARROW:FLIGHT:SQL:IS_SEARCHABLE     - "1" indicates if the column is searchable via WHERE clause, "0" otherwise.
 * The returned data should be ordered by catalog_name, db_schema_name, table_name, then table_type, followed by table_schema if requested.
 */
message CommandGetTables {
  option (experimental) = true;

  /*
   * Specifies the Catalog to search for the tables.
   * An empty string retrieves those without a catalog.
   * If omitted the catalog name should not be used to narrow the search.
   */
  optional string catalog = 1;

  /*
   * Specifies a filter pattern for schemas to search for.
   * When no db_schema_filter_pattern is provided, all schemas matching other filters are searched.
   * In the pattern string, two special characters can be used to denote matching rules:
   *    - "%" means to match any substring with 0 or more characters.
   *    - "_" means to match any one character.
   */
  optional string db_schema_filter_pattern = 2;

  /*
   * Specifies a filter pattern for tables to search for.
   * When no table_name_filter_pattern is provided, all tables matching other filters are searched.
   * In the pattern string, two special characters can be used to denote matching rules:
   *    - "%" means to match any substring with 0 or more characters.
   *    - "_" means to match any one character.
   */
  optional string table_name_filter_pattern = 3;

  /*
   * Specifies a filter of table types which must match.
   * The table types depend on vendor/implementation. It is usually used to separate tables from views or system tables.
   * TABLE, VIEW, and SYSTEM TABLE are commonly supported.
   */
  repeated string table_types = 4;

  // Specifies if the Arrow schema should be returned for found tables.
  bool include_schema = 5;
}

/*
 * Represents a request to retrieve the list of table types on a Flight SQL enabled backend.
 * The table types depend on vendor/implementation. It is usually used to separate tables from views or system tables.
 * TABLE, VIEW, and SYSTEM TABLE are commonly supported.
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  table_type: utf8 not null
 * >
 * The returned data should be ordered by table_type.
 */
message CommandGetTableTypes {
  option (experimental) = true;
}

/*
 * Represents a request to retrieve the primary keys of a table on a Flight SQL enabled backend.
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  catalog_name: utf8,
 *  db_schema_name: utf8,
 *  table_name: utf8 not null,
 *  column_name: utf8 not null,
 *  key_name: utf8,
 *  key_sequence: int not null
 * >
 * The returned data should be ordered by catalog_name, db_schema_name, table_name, key_name, then key_sequence.
 */
message CommandGetPrimaryKeys {
  option (experimental) = true;

  /*
   * Specifies the catalog to search for the table.
   * An empty string retrieves those without a catalog.
   * If omitted the catalog name should not be used to narrow the search.
   */
  optional string catalog = 1;

  /*
   * Specifies the schema to search for the table.
   * An empty string retrieves those without a schema.
   * If omitted the schema name should not be used to narrow the search.
   */
  optional string db_schema = 2;

  // Specifies the table to get the primary keys for.
  string table = 3;
}

enum UpdateDeleteRules {
  CASCADE = 0;
  RESTRICT = 1;
  SET_NULL = 2;
  NO_ACTION = 3;
  SET_DEFAULT = 4;
}

/*
 * Represents a request to retrieve a description of the foreign key columns that reference the given table's
 * primary key columns (the foreign keys exported by a table) of a table on a Flight SQL enabled backend.
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  pk_catalog_name: utf8,
 *  pk_db_schema_name: utf8,
 *  pk_table_name: utf8 not null,
 *  pk_column_name: utf8 not null,
 *  fk_catalog_name: utf8,
 *  fk_db_schema_name: utf8,
 *  fk_table_name: utf8 not null,
 *  fk_column_name: utf8 not null,
 *  key_sequence: int not null,
 *  fk_key_name: utf8,
 *  pk_key_name: utf8,
 *  update_rule: uint1 not null,
 *  delete_rule: uint1 not null
 * >
 * The returned data should be ordered by fk_catalog_name, fk_db_schema_name, fk_table_name, fk_key_name, then key_sequence.
 * update_rule and delete_rule returns a byte that is equivalent to actions declared on UpdateDeleteRules enum.
 */
message CommandGetExportedKeys {
  option (experimental) = true;

  /*
   * Specifies the catalog to search for the foreign key table.
   * An empty string retrieves those without a catalog.
   * If omitted the catalog name should not be used to narrow the search.
   */
  optional string catalog = 1;

  /*
   * Specifies the schema to search for the foreign key table.
   * An empty string retrieves those without a schema.
   * If omitted the schema name should not be used to narrow the search.
   */
  optional string db_schema = 2;

  // Specifies the foreign key table to get the foreign keys for.
  string table = 3;
}

/*
 * Represents a request to retrieve the foreign keys of a table on a Flight SQL enabled backend.
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  pk_catalog_name: utf8,
 *  pk_db_schema_name: utf8,
 *  pk_table_name: utf8 not null,
 *  pk_column_name: utf8 not null,
 *  fk_catalog_name: utf8,
 *  fk_db_schema_name: utf8,
 *  fk_table_name: utf8 not null,
 *  fk_column_name: utf8 not null,
 *  key_sequence: int not null,
 *  fk_key_name: utf8,
 *  pk_key_name: utf8,
 *  update_rule: uint1 not null,
 *  delete_rule: uint1 not null
 * >
 * The returned data should be ordered by pk_catalog_name, pk_db_schema_name, pk_table_name, pk_key_name, then key_sequence.
 * update_rule and delete_rule returns a byte that is equivalent to actions:
 *    - 0 = CASCADE
 *    - 1 = RESTRICT
 *    - 2 = SET NULL
 *    - 3 = NO ACTION
 *    - 4 = SET DEFAULT
 */
message CommandGetImportedKeys {
  option (experimental) = true;

  /*
   * Specifies the catalog to search for the primary key table.
   * An empty string retrieves those without a catalog.
   * If omitted the catalog name should not be used to narrow the search.
   */
  optional string catalog = 1;

  /*
   * Specifies the schema to search for the primary key table.
   * An empty string retrieves those without a schema.
   * If omitted the schema name should not be used to narrow the search.
   */
  optional string db_schema = 2;

  // Specifies the primary key table to get the foreign keys for.
  string table = 3;
}

/*
 * Represents a request to retrieve a description of the foreign key columns in the given foreign key table that
 * reference the primary key or the columns representing a unique constraint of the parent table (could be the same
 * or a different table) on a Flight SQL enabled backend.
 * Used in the command member of FlightDescriptor for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *  - GetFlightInfo: execute the catalog metadata request.
 *
 * The returned Arrow schema will be:
 * <
 *  pk_catalog_name: utf8,
 *  pk_db_schema_name: utf8,
 *  pk_table_name: utf8 not null,
 *  pk_column_name: utf8 not null,
 *  fk_catalog_name: utf8,
 *  fk_db_schema_name: utf8,
 *  fk_table_name: utf8 not null,
 *  fk_column_name: utf8 not null,
 *  key_sequence: int not null,
 *  fk_key_name: utf8,
 *  pk_key_name: utf8,
 *  update_rule: uint1 not null,
 *  delete_rule: uint1 not null
 * >
 * The returned data should be ordered by pk_catalog_name, pk_db_schema_name, pk_table_name, pk_key_name, then key_sequence.
 * update_rule and delete_rule returns a byte that is equivalent to actions:
 *    - 0 = CASCADE
 *    - 1 = RESTRICT
 *    - 2 = SET NULL
 *    - 3 = NO ACTION
 *    - 4 = SET DEFAULT
 */
message CommandGetCrossReference {
  option (experimental) = true;

  /**
   * The catalog name where the parent table is.
   * An empty string retrieves those without a catalog.
   * If omitted the catalog name should not be used to narrow the search.
   */
  optional string pk_catalog = 1;

  /**
   * The Schema name where the parent table is.
   * An empty string retrieves those without a schema.
   * If omitted the schema name should not be used to narrow the search.
   */
  optional string pk_db_schema = 2;

  /**
   * The parent table name. It cannot be null.
   */
  string pk_table = 3;

  /**
   * The catalog name where the foreign table is.
   * An empty string retrieves those without a catalog.
   * If omitted the catalog name should not be used to narrow the search.
   */
  optional string fk_catalog = 4;

  /**
   * The schema name where the foreign table is.
   * An empty string retrieves those without a schema.
   * If omitted the schema name should not be used to narrow the search.
   */
  optional string fk_db_schema = 5;

  /**
   * The foreign table name. It cannot be null.
   */
  string fk_table = 6;
}

// SQL Execution Action Messages

/*
 * Request message for the "CreatePreparedStatement" action on a Flight SQL enabled backend.
 */
message ActionCreatePreparedStatementRequest {
  option (experimental) = true;

  // The valid SQL string to create a prepared statement for.
  string query = 1;
}

/*
 * Wrap the result of a "GetPreparedStatement" action.
 *
 * The resultant PreparedStatement can be closed either:
 * - Manually, through the "ClosePreparedStatement" action;
 * - Automatically, by a server timeout.
 */
message ActionCreatePreparedStatementResult {
  option (experimental) = true;

  // Opaque handle for the prepared statement on the server.
  bytes prepared_statement_handle = 1;

  // If a result set generating query was provided, dataset_schema contains the
  // schema of the dataset as described in Schema.fbs::Schema, it is serialized as an IPC message.
  bytes dataset_schema = 2;

  // If the query provided contained parameters, parameter_schema contains the
  // schema of the expected parameters as described in Schema.fbs::Schema, it is serialized as an IPC message.
  bytes parameter_schema = 3;
}

/*
 * Request message for the "ClosePreparedStatement" action on a Flight SQL enabled backend.
 * Closes server resources associated with the prepared statement handle.
 */
message ActionClosePreparedStatementRequest {
  option (experimental) = true;

  // Opaque handle for the prepared statement on the server.
  bytes prepared_statement_handle = 1;
}


// SQL Execution Messages.

/*
 * Represents a SQL query. Used in the command member of FlightDescriptor
 * for the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *    Fields on this schema may contain the following metadata:
 *    - ARROW:FLIGHT:SQL:CATALOG_NAME      - Table's catalog name
 *    - ARROW:FLIGHT:SQL:DB_SCHEMA_NAME    - Database schema name
 *    - ARROW:FLIGHT:SQL:TABLE_NAME        - Table name
 *    - ARROW:FLIGHT:SQL:PRECISION         - Column precision/size
 *    - ARROW:FLIGHT:SQL:SCALE             - Column scale/decimal digits if applicable
 *    - ARROW:FLIGHT:SQL:IS_AUTO_INCREMENT - "1" indicates if the column is auto incremented, "0" otherwise.
 *    - ARROW:FLIGHT:SQL:IS_CASE_SENSITIVE - "1" indicates if the column is case sensitive, "0" otherwise.
 *    - ARROW:FLIGHT:SQL:IS_READ_ONLY      - "1" indicates if the column is read only, "0" otherwise.
 *    - ARROW:FLIGHT:SQL:IS_SEARCHABLE     - "1" indicates if the column is searchable via WHERE clause, "0" otherwise.
 *  - GetFlightInfo: execute the query.
 */
message CommandStatementQuery {
  option (experimental) = true;

  // The SQL syntax.
  string query = 1;
}

/**
 * Represents a ticket resulting from GetFlightInfo with a CommandStatementQuery.
 * This should be used only once and treated as an opaque value, that is, clients should not attempt to parse this.
 */
message TicketStatementQuery {
  option (experimental) = true;

  // Unique identifier for the instance of the statement to execute.
  bytes statement_handle = 1;
}

/*
 * Represents an instance of executing a prepared statement. Used in the command member of FlightDescriptor for
 * the following RPC calls:
 *  - GetSchema: return the Arrow schema of the query.
 *    Fields on this schema may contain the following metadata:
 *    - ARROW:FLIGHT:SQL:CATALOG_NAME      - Table's catalog name
 *    - ARROW:FLIGHT:SQL:DB_SCHEMA_NAME    - Database schema name
 *    - ARROW:FLIGHT:SQL:TABLE_NAME        - Table name
 *    - ARROW:FLIGHT:SQL:PRECISION         - Column precision/size
 *    - ARROW:FLIGHT:SQL:SCALE             - Column scale/decimal digits if applicable
 *    - ARROW:FLIGHT:SQL:IS_AUTO_INCREMENT - "1" indicates if the column is auto incremented, "0" otherwise.
 *    - ARROW:FLIGHT:SQL:IS_CASE_SENSITIVE - "1" indicates if the column is case sensitive, "0" otherwise.
 *    - ARROW:FLIGHT:SQL:IS_READ_ONLY      - "1" indicates if the column is read only, "0" otherwise.
 *    - ARROW:FLIGHT:SQL:IS_SEARCHABLE     - "1" indicates if the column is searchable via WHERE clause, "0" otherwise.
 *  - DoPut: bind parameter values. All of the bound parameter sets will be executed as a single atomic execution.
 *  - GetFlightInfo: execute the prepared statement instance.
 */
message CommandPreparedStatementQuery {
  option (experimental) = true;

  // Opaque handle for the prepared statement on the server.
  bytes prepared_statement_handle = 1;
}

/*
 * Represents a SQL update query. Used in the command member of FlightDescriptor
 * for the the RPC call DoPut to cause the server to execute the included SQL update.
 */
message CommandStatementUpdate {
  option (experimental) = true;

  // The SQL syntax.
  string query = 1;
}

/*
 * Represents a SQL update query. Used in the command member of FlightDescriptor
 * for the the RPC call DoPut to cause the server to execute the included
 * prepared statement handle as an update.
 */
message CommandPreparedStatementUpdate {
  option (experimental) = true;

  // Opaque handle for the prepared statement on the server.
  bytes prepared_statement_handle = 1;
}

/*
 * Returned from the RPC call DoPut when a CommandStatementUpdate
 * CommandPreparedStatementUpdate was in the request, containing
 * results from the update.
 */
message DoPutUpdateResult {
  option (experimental) = true;

  // The number of records updated. A return value of -1 represents
  // an unknown updated record count.
  int64 record_count = 1;
}

extend google.protobuf.MessageOptions {
  bool experimental = 1000;
}