Add guc optimizer_enable_parallel_append.

Author: zhangwenchao-123

src/backend/gpopt/config/CConfigParamMapping.cpp

@@ -284,6 +284,10 @@ CConfigParamMapping::SConfigMappingElem CConfigParamMapping::m_elements[] = {
 	 GPOS_WSZ_LIT(
 		 "Enable Eager Agg transform for pushing aggregate below an innerjoin.")},
 
+	{EopttraceEnableParallelAppendScan, &optimizer_enable_parallel_append,
+	 false,	 // m_negate_param
+	 GPOS_WSZ_LIT("Enable parallel append for scan/bitmap/index scan in partition tables.")},
+
 	{EopttraceDisableOrderedAgg, &optimizer_enable_orderedagg,
 	 true,	// m_negate_param
 	 GPOS_WSZ_LIT("Disable ordered aggregate plans.")},

src/backend/gporca/libgpopt/src/xforms/CXformDynamicGet2ParallelAppendTableScan.cpp

@@ -71,6 +71,9 @@ CXformDynamicGet2ParallelAppendTableScan::Exfp(CExpressionHandle &exprhdl) const
 		return CXform::ExfpNone;
 	}
 
+	if (GPOS_FTRACE(EopttraceEnableParallelAppendScan))
+		return CXform::ExfpNone;
+
 	CLogicalDynamicGet *popGet = CLogicalDynamicGet::PopConvert(exprhdl.Pop());
 	CTableDescriptor *ptabdesc = popGet->Ptabdesc();
 

src/backend/gporca/libnaucrates/include/naucrates/traceflags/traceflags.h

@@ -188,6 +188,9 @@ enum EOptTraceFlag
 	// Eager Agg
 	EopttraceEnableEagerAgg = 103030,
 
+	// Enable parallel append scan
+	EopttraceEnableParallelAppendScan = 103031,
+
 	// ExpandFullJoin
 	EopttraceExpandFullJoin = 103032,
 

src/backend/utils/misc/guc_gp.c

@@ -332,6 +332,7 @@ bool		optimizer_enable_motion_gather;
 bool		optimizer_enable_motion_redistribute;
 bool		optimizer_enable_sort;
 bool		optimizer_enable_materialize;
+bool		optimizer_enable_parallel_append;
 bool		optimizer_enable_partition_propagation;
 bool		optimizer_enable_partition_selection;
 bool		optimizer_enable_outerjoin_rewrite;
@@ -2261,6 +2262,16 @@ struct config_bool ConfigureNamesBool_gp[] =
 		true,
 		NULL, NULL, NULL
 	},
+	{
+		{"optimizer_enable_parallel_append", PGC_USERSET, DEVELOPER_OPTIONS,
+		 gettext_noop("Enable parallel append for seq/bitmap/index scan in partition table."),
+		 NULL,
+		 GUC_NOT_IN_SAMPLE
+		},
+		&optimizer_enable_parallel_append,
+		false,
+		NULL, NULL, NULL
+	},
 	{
 		{"optimizer_enable_partition_propagation", PGC_USERSET, DEVELOPER_OPTIONS,
 			gettext_noop("Enable plans with Partition Propagation operators in the optimizer."),

src/include/utils/guc.h

@@ -515,6 +515,7 @@ extern bool optimizer_enable_motion_gather;
 extern bool optimizer_enable_motion_redistribute;
 extern bool optimizer_enable_sort;
 extern bool optimizer_enable_materialize;
+extern bool optimizer_enable_parallel_append;
 extern bool optimizer_enable_partition_propagation;
 extern bool optimizer_enable_partition_selection;
 extern bool optimizer_enable_outerjoin_rewrite;

src/include/utils/unsync_guc_name.h

@@ -428,6 +428,7 @@
 		"optimizer_enable_nljoin",
 		"optimizer_enable_outerjoin_rewrite",
 		"optimizer_enable_outerjoin_to_unionall_rewrite",
+		"optimizer_enable_parallel_append",
 		"optimizer_enable_partition_propagation",
 		"optimizer_enable_partition_selection",
 		"optimizer_enable_push_join_below_union_all",