[
  {
    "new_type_name": "AclMode",
    "source_type": "uint32",
    "comment": "/*\n * Grantable rights are encoded so that we can OR them together in a bitmask.\n * The present representation of AclItem limits us to 16 distinct rights,\n * even though AclMode is defined as uint32.  See utils/acl.h.\n *\n * Caution: changing these codes breaks stored ACLs, hence forces initdb.\n */\n"
  },
  {
    "new_type_name": "DistinctExpr",
    "source_type": "OpExpr",
    "comment": "/*\n * DistinctExpr - expression node for \"x IS DISTINCT FROM y\"\n *\n * Except for the nodetag, this is represented identically to an OpExpr\n * referencing the \"=\" operator for x and y.\n * We use \"=\", not the more obvious \"<>\", because more datatypes have \"=\"\n * than \"<>\".  This means the executor must invert the operator result.\n * Note that the operator function won't be called at all if either input\n * is NULL, since then the result can be determined directly.\n */\n"
  },
  {
    "new_type_name": "NullIfExpr",
    "source_type": "OpExpr",
    "comment": "/*\n * NullIfExpr - a NULLIF expression\n *\n * Like DistinctExpr, this is represented the same as an OpExpr referencing\n * the \"=\" operator for x and y.\n */\n"
  },
  {
    "new_type_name": "Selectivity",
    "source_type": "double",
    "comment": "/*\n * Typedefs for identifying qualifier selectivities and plan costs as such.\n * These are just plain \"double\"s, but declaring a variable as Selectivity\n * or Cost makes the intent more obvious.\n *\n * These could have gone into plannodes.h or some such, but many files\n * depend on them...\n */\n"
  },
  {
    "new_type_name": "Cost",
    "source_type": "double",
    "comment": null
  },
  {
    "new_type_name": "Cardinality",
    "source_type": "double",
    "comment": null
  },
  {
    "new_type_name": "ParamListInfo",
    "source_type": "ParamListInfoData",
    "comment": null
  },
  {
    "new_type_name": "AttrNumber",
    "source_type": "int16",
    "comment": "/*\n * user defined attribute numbers start at 1.   -ay 2/95\n */\n"
  },
  {
    "new_type_name": "Pointer",
    "source_type": "char",
    "comment": "/*\n * Pointer\n *\t\tVariable holding address of any memory resident object.\n *\n *\t\tXXX Pointer arithmetic is done with this, so it can't be void *\n *\t\tunder \"true\" ANSI compilers.\n */\n"
  },
  {
    "new_type_name": "Index",
    "source_type": "unsigned int",
    "comment": "/*\n * Index\n *\t\tIndex into any memory resident array.\n *\n * Note:\n *\t\tIndices are non negative.\n */\n"
  },
  {
    "new_type_name": "Offset",
    "source_type": "signed int",
    "comment": "/*\n * Offset\n *\t\tOffset into any memory resident array.\n *\n * Note:\n *\t\tThis differs from an Index in that an Index is always\n *\t\tnon negative, whereas Offset may be negative.\n */\n"
  },
  {
    "new_type_name": "regproc",
    "source_type": "Oid",
    "comment": "/*\n * regproc is the type name used in the include/catalog headers, but\n * RegProcedure is the preferred name in C code.\n */\n"
  },
  {
    "new_type_name": "RegProcedure",
    "source_type": "regproc",
    "comment": null
  },
  {
    "new_type_name": "TransactionId",
    "source_type": "uint32",
    "comment": null
  },
  {
    "new_type_name": "LocalTransactionId",
    "source_type": "uint32",
    "comment": null
  },
  {
    "new_type_name": "SubTransactionId",
    "source_type": "uint32",
    "comment": null
  },
  {
    "new_type_name": "MultiXactId",
    "source_type": "TransactionId",
    "comment": "/* MultiXactId must be equivalent to TransactionId, to fit in t_xmax */\n"
  },
  {
    "new_type_name": "MultiXactOffset",
    "source_type": "uint32",
    "comment": null
  },
  {
    "new_type_name": "CommandId",
    "source_type": "uint32",
    "comment": null
  },
  {
    "new_type_name": "Name",
    "source_type": "NameData",
    "comment": "/*\n * Representation of a Name: effectively just a C string, but null-padded to\n * exactly NAMEDATALEN bytes.  The use of a struct is historical.\n */\n"
  },
  {
    "new_type_name": "ExpandedObjectHeader",
    "source_type": "ExpandedObjectHeader",
    "comment": "/*\n * struct varatt_expanded is a \"TOAST pointer\" representing an out-of-line\n * Datum that is stored in memory, in some type-specific, not necessarily\n * physically contiguous format that is convenient for computation not\n * storage.  APIs for this, in particular the definition of struct\n * ExpandedObjectHeader, are in src/include/utils/expandeddatum.h.\n *\n * Note that just as for struct varatt_external, this struct is stored\n * unaligned within any containing tuple.\n */\n"
  },
  {
    "new_type_name": "Datum",
    "source_type": "uintptr_t",
    "comment": "/*\n * A Datum contains either a value of a pass-by-value type or a pointer to a\n * value of a pass-by-reference type.  Therefore, we require:\n *\n * sizeof(Datum) == sizeof(void *) == 4 or 8\n *\n * The macros below and the analogous macros for other types should be used to\n * convert between a Datum and the appropriate C type.\n */\n"
  },
  {
    "new_type_name": "Oid",
    "source_type": "unsigned int",
    "comment": "/*\n * Object ID is a fundamental type in Postgres.\n */\n"
  },
  {
    "new_type_name": "ParallelVacuumState",
    "source_type": "ParallelVacuumState",
    "comment": "/* Abstract type for parallel vacuum state */\n"
  },
  {
    "new_type_name": "VacAttrStatsP",
    "source_type": "VacAttrStats",
    "comment": "/*----------\n * ANALYZE builds one of these structs for each attribute (column) that is\n * to be analyzed.  The struct and subsidiary data are in anl_context,\n * so they live until the end of the ANALYZE operation.\n *\n * The type-specific typanalyze function is passed a pointer to this struct\n * and must return true to continue analysis, false to skip analysis of this\n * column.  In the true case it must set the compute_stats and minrows fields,\n * and can optionally set extra_data to pass additional info to compute_stats.\n * minrows is its request for the minimum number of sample rows to be gathered\n * (but note this request might not be honored, eg if there are fewer rows\n * than that in the table).\n *\n * The compute_stats routine will be called after sample rows have been\n * gathered.  Aside from this struct, it is passed:\n *\t\tfetchfunc: a function for accessing the column values from the\n *\t\t\t\t   sample rows\n *\t\tsamplerows: the number of sample tuples\n *\t\ttotalrows: estimated total number of rows in relation\n * The fetchfunc may be called with rownum running from 0 to samplerows-1.\n * It returns a Datum and an isNull flag.\n *\n * compute_stats should set stats_valid true if it is able to compute\n * any useful statistics.  If it does, the remainder of the struct holds\n * the information to be stored in a pg_statistic row for the column.  Be\n * careful to allocate any pointed-to data in anl_context, which will NOT\n * be CurrentMemoryContext when compute_stats is called.\n *\n * Note: all comparisons done for statistical purposes should use the\n * underlying column's collation (attcollation), except in situations\n * where a noncollatable container type contains a collatable type;\n * in that case use the type's default collation.  Be sure to record\n * the appropriate collation in stacoll.\n *----------\n */\n"
  },
  {
    "new_type_name": "BlockNumber",
    "source_type": "uint32",
    "comment": "/*\n * BlockNumber:\n *\n * each data file (heap or index) is divided into postgres disk blocks\n * (which may be thought of as the unit of i/o -- a postgres buffer\n * contains exactly one disk block).  the blocks are numbered\n * sequentially, 0 to 0xFFFFFFFE.\n *\n * InvalidBlockNumber is the same thing as P_NEW in bufmgr.h.\n *\n * the access methods, the buffer manager and the storage manager are\n * more or less the only pieces of code that should be accessing disk\n * blocks directly.\n */\n"
  },
  {
    "new_type_name": "BlockId",
    "source_type": "BlockIdData",
    "comment": null
  },
  {
    "new_type_name": "pg_wchar",
    "source_type": "unsigned int",
    "comment": "/*\n * The pg_wchar type\n */\n"
  }
]