fix core when commit prepared xact

src/gausskernel/storage/access/transam/twophase.cpp

@@ -2079,6 +2079,14 @@ void FinishPreparedTransaction(const char* gid, bool isCommit)
      * callbacks will release the locks the transaction held.
      */
     if (isCommit) {
+        CommitSeqNo csn = SetXact2CommitInProgress(xid, 0);
+        if (XLogStandbyInfoActive()) {
+            XLogBeginInsert();
+            XLogRegisterData((char*)(&xid), sizeof(TransactionId));
+            XLogRegisterData((char*)(&csn), sizeof(CommitSeqNo));
+            XLogInsert(RM_STANDBY_ID, XLOG_STANDBY_CSN_COMMITTING);
+        }
+        setCommitCsn(getNextCSN());
         pgxact->needToSyncXid = true;
         RecordTransactionCommitPrepared(xid,
             hdr->nsubxacts,

src/test/regress/expected/transactions.out

@@ -614,6 +614,58 @@ fetch from foo;
 (1 row)
 
 abort;
+-- Test for prepared xacts
+create table prepared_xact_test(a int);
+start transaction;
+insert into prepared_xact_test values (1);
+prepare transaction 'pxact1';
+commit;
+WARNING:  there is no transaction in progress
+select * from prepared_xact_test;
+ a
+---
+(0 rows)
+
+select gid from pg_prepared_xacts;
+  gid 
+--------
+ pxact1
+(1 row)
+
+commit prepared 'pxact1';
+select * from prepared_xact_test;
+ a
+---
+ 1
+(1 row)
+
+select * from pg_prepared_xacts;
+ transaction | gid | prepared | owner | database
+-------------+-----+----------+-------+----------
+(0 rows)
+
+begin;
+insert into prepared_xact_test values (2);
+prepare transaction 'pxact2';
+select gid from pg_prepared_xacts;
+  gid 
+--------
+ pxact2
+(1 row)
+
+rollback prepared 'pxact2';
+select * from prepared_xact_test;
+ a
+---
+ 1
+(1 row)
+
+select * from pg_prepared_xacts;
+ transaction | gid | prepared | owner | database
+-------------+-----+----------+-------+----------
+(0 rows)
+
+drop table prepared_xact_test;
 -- Test for proper cleanup after a failure in a cursor portal
 -- that was created in an outer subtransaction
 CREATE FUNCTION invert(x float8) RETURNS float8 LANGUAGE plpgsql AS

src/test/regress/sql/transactions.sql

@@ -368,6 +368,28 @@ fetch from foo;
 
 abort;
 
+-- Test for prepared xacts
+create table prepared_xact_test(a int);
+start transaction;
+insert into prepared_xact_test values (1);
+prepare transaction 'pxact1';
+commit;
+select * from prepared_xact_test;
+select gid from pg_prepared_xacts;
+commit prepared 'pxact1';
+select * from prepared_xact_test;
+select * from pg_prepared_xacts;
+
+begin;
+insert into prepared_xact_test values (2);
+prepare transaction 'pxact2';
+select gid from pg_prepared_xacts;
+rollback prepared 'pxact2';
+select * from prepared_xact_test;
+select * from pg_prepared_xacts;
+
+drop table prepared_xact_test;
+
 -- Test for proper cleanup after a failure in a cursor portal
 -- that was created in an outer subtransaction
 CREATE FUNCTION invert(x float8) RETURNS float8 LANGUAGE plpgsql AS