commit 48cc023e889e02f8f172c5130a6f958c92da3ddf
Author: Lukas Fittl <lukas@fittl.com>
Date:   Sat Feb 20 04:38:04 2021 -0800

    Avoid zero-length delimiter in regression test files
    
    This is a pg_query-specific patch that ensures we can use the split
    function on the regression test files. Zero-length delimiters fail
    at the scanner level in Postgres, and thus need to be removed.

diff --git a/src/test/regress/expected/copy2.out b/src/test/regress/expected/copy2.out
index 61a19cdc4c..dea5308f64 100644
--- a/src/test/regress/expected/copy2.out
+++ b/src/test/regress/expected/copy2.out
@@ -510,9 +510,9 @@ BEGIN;
 COPY forcetest (a, b, c) FROM STDIN WITH (FORMAT csv, FORCE_NOT_NULL(b), FORCE_NULL(c));
 COMMIT;
 SELECT b, c FROM forcetest WHERE a = 1;
- b |  c   
----+------
-   | NULL
+ b |    c     
+---+----------
+   | notempty
 (1 row)
 
 -- should succeed, FORCE_NULL and FORCE_NOT_NULL can be both specified
@@ -520,17 +520,17 @@ BEGIN;
 COPY forcetest (a, b, c, d) FROM STDIN WITH (FORMAT csv, FORCE_NOT_NULL(c,d), FORCE_NULL(c,d));
 COMMIT;
 SELECT c, d FROM forcetest WHERE a = 2;
- c |  d   
----+------
-   | NULL
+ c |    d     
+---+----------
+   | notempty
 (1 row)
 
 -- should fail with not-null constraint violation
 BEGIN;
 COPY forcetest (a, b, c) FROM STDIN WITH (FORMAT csv, FORCE_NULL(b), FORCE_NOT_NULL(c));
 ERROR:  null value in column "b" of relation "forcetest" violates not-null constraint
-DETAIL:  Failing row contains (3, null, , null, null).
-CONTEXT:  COPY forcetest, line 1: "3,,"""
+DETAIL:  Failing row contains (3, null, notempty, null, null).
+CONTEXT:  COPY forcetest, line 1: "3,,"notempty""
 ROLLBACK;
 -- should fail with "not referenced by COPY" error
 BEGIN;
diff --git a/src/test/regress/expected/create_am.out b/src/test/regress/expected/create_am.out
index 35d4cf1d46..4a24834dab 100644
--- a/src/test/regress/expected/create_am.out
+++ b/src/test/regress/expected/create_am.out
@@ -537,10 +537,8 @@ ORDER BY 3, 1, 2;
 ROLLBACK;
 -- Third, check that we can neither create a table using a nonexistent
 -- AM, nor using an index AM
-CREATE TABLE i_am_a_failure() USING "";
-ERROR:  zero-length delimited identifier at or near """"
-LINE 1: CREATE TABLE i_am_a_failure() USING "";
-                                            ^
+CREATE TABLE i_am_a_failure() USING "notempty";
+ERROR:  access method "notempty" does not exist
 CREATE TABLE i_am_a_failure() USING i_do_not_exist_am;
 ERROR:  access method "i_do_not_exist_am" does not exist
 CREATE TABLE i_am_a_failure() USING "I do not exist AM";
diff --git a/src/test/regress/sql/copy2.sql b/src/test/regress/sql/copy2.sql
index 8b14962194..9a5eaf3a6d 100644
--- a/src/test/regress/sql/copy2.sql
+++ b/src/test/regress/sql/copy2.sql
@@ -325,21 +325,21 @@ CREATE TEMP TABLE forcetest (
 -- should succeed with no effect ("b" remains an empty string, "c" remains NULL)
 BEGIN;
 COPY forcetest (a, b, c) FROM STDIN WITH (FORMAT csv, FORCE_NOT_NULL(b), FORCE_NULL(c));
-1,,""
+1,,"notempty"
 \.
 COMMIT;
 SELECT b, c FROM forcetest WHERE a = 1;
 -- should succeed, FORCE_NULL and FORCE_NOT_NULL can be both specified
 BEGIN;
 COPY forcetest (a, b, c, d) FROM STDIN WITH (FORMAT csv, FORCE_NOT_NULL(c,d), FORCE_NULL(c,d));
-2,'a',,""
+2,'a',,"notempty"
 \.
 COMMIT;
 SELECT c, d FROM forcetest WHERE a = 2;
 -- should fail with not-null constraint violation
 BEGIN;
 COPY forcetest (a, b, c) FROM STDIN WITH (FORMAT csv, FORCE_NULL(b), FORCE_NOT_NULL(c));
-3,,""
+3,,"notempty"
 \.
 ROLLBACK;
 -- should fail with "not referenced by COPY" error
@@ -353,21 +353,21 @@ ROLLBACK;
 -- should succeed with no effect ("b" remains an empty string, "c" remains NULL)
 BEGIN;
 COPY forcetest (a, b, c) FROM STDIN WITH (FORMAT csv, FORCE_NOT_NULL *, FORCE_NULL *);
-4,,""
+4,,"notempty"
 \.
 COMMIT;
 SELECT b, c FROM forcetest WHERE a = 4;
 -- should succeed with effect ("b" remains an empty string)
 BEGIN;
 COPY forcetest (a, b, c) FROM STDIN WITH (FORMAT csv, FORCE_NOT_NULL *);
-5,,""
+5,,"notempty"
 \.
 COMMIT;
 SELECT b, c FROM forcetest WHERE a = 5;
 -- should succeed with effect ("c" remains NULL)
 BEGIN;
 COPY forcetest (a, b, c) FROM STDIN WITH (FORMAT csv, FORCE_NULL *);
-6,"b",""
+6,"b","notempty"
 \.
 COMMIT;
 SELECT b, c FROM forcetest WHERE a = 6;
diff --git a/src/test/regress/sql/create_am.sql b/src/test/regress/sql/create_am.sql
index 825aed325e..f305bf68ce 100644
--- a/src/test/regress/sql/create_am.sql
+++ b/src/test/regress/sql/create_am.sql
@@ -343,7 +343,7 @@ ROLLBACK;
 
 -- Third, check that we can neither create a table using a nonexistent
 -- AM, nor using an index AM
-CREATE TABLE i_am_a_failure() USING "";
+CREATE TABLE i_am_a_failure() USING "notempty";
 CREATE TABLE i_am_a_failure() USING i_do_not_exist_am;
 CREATE TABLE i_am_a_failure() USING "I do not exist AM";
 CREATE TABLE i_am_a_failure() USING "btree";