Fix bug in COMMIT AND CHAIN command.

This commit fixes COMMIT AND CHAIN command so that it starts new transaction
immediately even if savepoints are defined within the transaction to commit.
Previously COMMIT AND CHAIN command did not in that case because
commit 280a408b48 forgot to make CommitTransactionCommand() handle
a transaction chaining when the transaction state was TBLOCK_SUBCOMMIT.

Also this commit adds the regression test for COMMIT AND CHAIN command
when savepoints are defined.

Back-patch to v12 where transaction chaining was added.

Reported-by: Arthur Nascimento
Author: Fujii Masao
Reviewed-by: Arthur Nascimento, Vik Fearing
Discussion: https://postgr.es/m/16867-3475744069228158@postgresql.org

3 files changed, 58 insertions, 0 deletions

diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 17fbc41bbb7..4e6a3df6b87 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -3105,6 +3105,13 @@ CommitTransactionCommand(void)
 				Assert(s->parent == NULL);
 				CommitTransaction();
 				s->blockState = TBLOCK_DEFAULT;
+				if (s->chain)
+				{
+					StartTransaction();
+					s->blockState = TBLOCK_INPROGRESS;
+					s->chain = false;
+					RestoreTransactionCharacteristics();
+				}
 			}
 			else if (s->blockState == TBLOCK_PREPARE)
 			{
diff --git a/src/test/regress/expected/transactions.out b/src/test/regress/expected/transactions.out
index 1b033100298..75dc6558d82 100644
--- a/src/test/regress/expected/transactions.out
+++ b/src/test/regress/expected/transactions.out
@@ -775,6 +775,46 @@ SHOW transaction_deferrable;
 
 INSERT INTO abc VALUES (5);
 COMMIT;
+START TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ WRITE, DEFERRABLE;
+SHOW transaction_isolation;
+ transaction_isolation 
+-----------------------
+ repeatable read
+(1 row)
+
+SHOW transaction_read_only;
+ transaction_read_only 
+-----------------------
+ off
+(1 row)
+
+SHOW transaction_deferrable;
+ transaction_deferrable 
+------------------------
+ on
+(1 row)
+
+SAVEPOINT x;
+COMMIT AND CHAIN;  -- TBLOCK_SUBCOMMIT
+SHOW transaction_isolation;
+ transaction_isolation 
+-----------------------
+ repeatable read
+(1 row)
+
+SHOW transaction_read_only;
+ transaction_read_only 
+-----------------------
+ off
+(1 row)
+
+SHOW transaction_deferrable;
+ transaction_deferrable 
+------------------------
+ on
+(1 row)
+
+COMMIT;
 -- different mix of options just for fun
 START TRANSACTION ISOLATION LEVEL SERIALIZABLE, READ WRITE, NOT DEFERRABLE;
 SHOW transaction_isolation;
diff --git a/src/test/regress/sql/transactions.sql b/src/test/regress/sql/transactions.sql
index bf1016489d1..d1b6ed0280d 100644
--- a/src/test/regress/sql/transactions.sql
+++ b/src/test/regress/sql/transactions.sql
@@ -458,6 +458,17 @@ SHOW transaction_deferrable;
 INSERT INTO abc VALUES (5);
 COMMIT;
 
+START TRANSACTION ISOLATION LEVEL REPEATABLE READ, READ WRITE, DEFERRABLE;
+SHOW transaction_isolation;
+SHOW transaction_read_only;
+SHOW transaction_deferrable;
+SAVEPOINT x;
+COMMIT AND CHAIN;  -- TBLOCK_SUBCOMMIT
+SHOW transaction_isolation;
+SHOW transaction_read_only;
+SHOW transaction_deferrable;
+COMMIT;
+
 -- different mix of options just for fun
 START TRANSACTION ISOLATION LEVEL SERIALIZABLE, READ WRITE, NOT DEFERRABLE;
 SHOW transaction_isolation;