From 32b492571e82f7349607b9bb01a6696aa6537564 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philip=20Dub=C3=A9?= <gunkmute@gmail.com>
Date: Wed, 17 Jul 2019 23:10:29 +0000
Subject: [PATCH] Update postgres_planning_functions.c

---
 .../planner/postgres_planning_functions.c     | 60 ++++++++++++++++++-
 1 file changed, 58 insertions(+), 2 deletions(-)

diff --git a/src/backend/distributed/planner/postgres_planning_functions.c b/src/backend/distributed/planner/postgres_planning_functions.c
index 822d29fa1..d8b8107a0 100644
--- a/src/backend/distributed/planner/postgres_planning_functions.c
+++ b/src/backend/distributed/planner/postgres_planning_functions.c
@@ -16,18 +16,73 @@
 #include "distributed/multi_master_planner.h"
 #include "nodes/plannodes.h"
 #if PG_VERSION_NUM >= 120000
+#include "nodes/nodeFuncs.h"
 #include "optimizer/optimizer.h"
 #else
 #include "optimizer/tlist.h"
 #endif
 
-
 /*
  * make_unique_from_sortclauses creates and returns a unique node
  * from provided distinct clause list.
  * The functions is copied from postgresql from
  * src/backend/optimizer/plan/createplan.c.
- *
+ */
+
+#if PG_VERSION_NUM >= 120000
+/*
+ * distinctList is a list of SortGroupClauses, identifying the targetlist items
+ * that should be considered by the Unique filter.  The input path must
+ * already be sorted accordingly.
+ */
+Unique *
+make_unique_from_sortclauses(Plan *lefttree, List *distinctList)
+{
+	Unique	   *node = makeNode(Unique);
+	Plan	   *plan = &node->plan;
+	int			numCols = list_length(distinctList);
+	int			keyno = 0;
+	AttrNumber *uniqColIdx;
+	Oid		   *uniqOperators;
+	Oid		   *uniqCollations;
+	ListCell   *slitem;
+
+	plan->targetlist = lefttree->targetlist;
+	plan->qual = NIL;
+	plan->lefttree = lefttree;
+	plan->righttree = NULL;
+
+	/*
+	 * convert SortGroupClause list into arrays of attr indexes and equality
+	 * operators, as wanted by executor
+	 */
+	Assert(numCols > 0);
+	uniqColIdx = (AttrNumber *) palloc(sizeof(AttrNumber) * numCols);
+	uniqOperators = (Oid *) palloc(sizeof(Oid) * numCols);
+	uniqCollations = (Oid *) palloc(sizeof(Oid) * numCols);
+
+	foreach(slitem, distinctList)
+	{
+		SortGroupClause *sortcl = (SortGroupClause *) lfirst(slitem);
+		TargetEntry *tle = get_sortgroupclause_tle(sortcl, plan->targetlist);
+
+		uniqColIdx[keyno] = tle->resno;
+		uniqOperators[keyno] = sortcl->eqop;
+		uniqCollations[keyno] = exprCollation((Node *) tle->expr);
+		Assert(OidIsValid(uniqOperators[keyno]));
+		keyno++;
+	}
+
+	node->numCols = numCols;
+	node->uniqColIdx = uniqColIdx;
+	node->uniqOperators = uniqOperators;
+	node->uniqCollations = uniqCollations;
+
+	return node;
+}
+
+#else
+/*
  * distinctList is a list of SortGroupClauses, identifying the targetlist items
  * that should be considered by the Unique filter.  The input path must
  * already be sorted accordingly.
@@ -73,3 +128,4 @@ make_unique_from_sortclauses(Plan *lefttree, List *distinctList)
 
 	return node;
 }
+#endif