Optimize COPY FREEZE with CREATE TABLE also.

Jeff Davis, additional test by me

Author: simonat2ndQuadrant

src/backend/commands/copy.c

@@ -2002,7 +2002,8 @@ CopyFrom(CopyState cstate)
 		if (cstate->freeze &&
 			ThereAreNoPriorRegisteredSnapshots() &&
 			ThereAreNoReadyPortals() &&
-			cstate->rel->rd_newRelfilenodeSubid == GetCurrentSubTransactionId())
+			(cstate->rel->rd_newRelfilenodeSubid == GetCurrentSubTransactionId() ||
+			 cstate->rel->rd_createSubid == GetCurrentSubTransactionId()))
 			hi_options |= HEAP_INSERT_FROZEN;
 	}
 

src/test/regress/expected/copy2.out

@@ -254,7 +254,17 @@ SELECT * FROM testnull;
     | 
 (4 rows)
 
+BEGIN;
 CREATE TABLE vistest (LIKE testeoc);
+COPY vistest FROM stdin CSV;
+COMMIT;
+SELECT xmax, * FROM vistest;
+ xmax | a  
+------+----
+    0 | a0
+    0 | b
+(2 rows)
+
 BEGIN;
 TRUNCATE vistest;
 COPY vistest FROM stdin CSV;
@@ -324,14 +334,12 @@ SELECT * FROM vistest;
 COMMIT;
 TRUNCATE vistest;
 COPY vistest FROM stdin CSV FREEZE;
-NOTICE:  FREEZE option specified but pre-conditions not met
 BEGIN;
 INSERT INTO vistest VALUES ('z');
 SAVEPOINT s1;
 TRUNCATE vistest;
 ROLLBACK TO SAVEPOINT s1;
 COPY vistest FROM stdin CSV FREEZE;
-NOTICE:  FREEZE option specified but pre-conditions not met
 SELECT * FROM vistest;
  a  
 ----

src/test/regress/sql/copy2.sql

@@ -178,8 +178,14 @@ COPY testnull FROM stdin WITH NULL AS E'\\0';
 
 SELECT * FROM testnull;
 
-
+BEGIN;
 CREATE TABLE vistest (LIKE testeoc);
+COPY vistest FROM stdin CSV;
+a0
+b
+\.
+COMMIT;
+SELECT * FROM vistest;
 BEGIN;
 TRUNCATE vistest;
 COPY vistest FROM stdin CSV;