Update GPORCA fallback messages when optimizer_enable_ctas is set to off

src/backend/gpopt/translate/CTranslatorQueryToDXL.cpp

@@ -408,7 +408,7 @@ CTranslatorQueryToDXL::CheckSupportedCmdType
 	{		
 		if (!optimizer_enable_ctas && NULL != pquery->intoClause)
 		{
-			GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiQuery2DXLUnsupportedFeature, GPOS_WSZ_LIT("CTAS"));
+			GPOS_RAISE(gpdxl::ExmaDXL, gpdxl::ExmiQuery2DXLUnsupportedFeature, GPOS_WSZ_LIT("CTAS. Set optimizer_enable_ctas to on to enable CTAS with GPORCA"));
 		}
 		
 		// supported: regular select or CTAS when it is enabled

src/test/regress/expected/gporca.out

@@ -10132,6 +10132,13 @@ explain select * from foo where b in ('1', '2');
  Optimizer status: legacy query optimizer
 (5 rows)
 
+set optimizer_enable_ctas = off;
+set client_min_messages='log';
+create table foo_ctas(a) as (select generate_series(1,10)) distributed by (a);
+LOG:  statement: create table foo_ctas(a) as (select generate_series(1,10)) distributed by (a);
+reset client_min_messages;
+LOG:  statement: reset client_min_messages;
+reset optimizer_enable_ctas;
 -- clean up
 drop schema orca cascade;
 NOTICE:  drop cascades to table orca.index_test

src/test/regress/expected/gporca_optimizer.out

@@ -10188,6 +10188,16 @@ explain select * from foo where b in ('1', '2');
  Optimizer status: PQO version 2.1
 (5 rows)
 
+set optimizer_enable_ctas = off;
+set client_min_messages='log';
+create table foo_ctas(a) as (select generate_series(1,10)) distributed by (a);
+LOG:  statement: create table foo_ctas(a) as (select generate_series(1,10)) distributed by (a);
+LOG:  2017-05-31 14:43:22:338568 PDT,THD000,NOTICE,"Feature not supported by the Pivotal Query Optimizer: CTAS. Set optimizer_enable_ctas to on to enable CTAS with GPORCA",
+INFO:  GPORCA failed to produce a plan, falling back to planner
+LOG:  Planner produced plan :0
+reset client_min_messages;
+LOG:  statement: reset client_min_messages;
+reset optimizer_enable_ctas;
 -- clean up
 drop schema orca cascade;
 NOTICE:  drop cascades to table orca.index_test

src/test/regress/sql/gporca.sql

@@ -1398,6 +1398,12 @@ create table foo (a int, b character varying(10));
 -- Query should not fallback to planner
 explain select * from foo where b in ('1', '2');
 
+set optimizer_enable_ctas = off;
+set client_min_messages='log';
+create table foo_ctas(a) as (select generate_series(1,10)) distributed by (a);
+reset client_min_messages;
+reset optimizer_enable_ctas;
+
 -- clean up
 drop schema orca cascade;
 reset optimizer_segments;