make the tests parallelizeable

helper view table_fkeys_in_workers now allows filtering by schema so that a test case can print out foreign keys in its schema only

src/test/regress/expected/foreign_key_to_reference_table.out

@@ -36,6 +36,8 @@ SELECT
           refd_relid::regclass::text
         FROM
           table_fkey_cols
+        WHERE
+          "schema" = 'fkey_reference_table'
       )
       d $$ )).RESULT::json )::json )).* ;
 CREATE TABLE referenced_table(id int UNIQUE, test_column int);

src/test/regress/expected/foreign_key_to_reference_table_0.out

@@ -36,6 +36,8 @@ SELECT
           refd_relid::regclass::text
         FROM
           table_fkey_cols
+        WHERE
+          "schema" = 'fkey_reference_table'
       )
       d $$ )).RESULT::json )::json )).* ;
 CREATE TABLE referenced_table(id int UNIQUE, test_column int);

src/test/regress/expected/multi_test_helpers.out

@@ -17,7 +17,8 @@ SELECT rc.constraint_name AS "name",
        kcu.column_name AS "column_name",
        uc_kcu.column_name AS "refd_column_name",
        format('%I.%I', kcu.table_schema, kcu.table_name)::regclass::oid AS relid,
-       format('%I.%I', uc_kcu.table_schema, uc_kcu.table_name)::regclass::oid AS refd_relid
+       format('%I.%I', uc_kcu.table_schema, uc_kcu.table_name)::regclass::oid AS refd_relid,
+       rc.constraint_schema AS "schema"
 FROM information_schema.referential_constraints rc,
      information_schema.key_column_usage kcu,
      information_schema.key_column_usage uc_kcu

src/test/regress/sql/foreign_key_to_reference_table.sql

@@ -28,6 +28,8 @@ SELECT
           refd_relid::regclass::text
         FROM
           table_fkey_cols
+        WHERE
+          "schema" = 'fkey_reference_table'
       )
       d $$ )).RESULT::json )::json )).* ;
 

src/test/regress/sql/multi_test_helpers.sql

@@ -19,7 +19,8 @@ SELECT rc.constraint_name AS "name",
        kcu.column_name AS "column_name",
        uc_kcu.column_name AS "refd_column_name",
        format('%I.%I', kcu.table_schema, kcu.table_name)::regclass::oid AS relid,
-       format('%I.%I', uc_kcu.table_schema, uc_kcu.table_name)::regclass::oid AS refd_relid
+       format('%I.%I', uc_kcu.table_schema, uc_kcu.table_name)::regclass::oid AS refd_relid,
+       rc.constraint_schema AS "schema"
 FROM information_schema.referential_constraints rc,
      information_schema.key_column_usage kcu,
      information_schema.key_column_usage uc_kcu