Remove unnecessary arguments from partitioning functions.

RelationGetPartitionQual() and generate_partition_qual() are always
called with recurse = true, so we don't need an argument for that.

Extracted by me from a larger patch by Amit Langote.

src/backend/catalog/partition.c

@@ -122,7 +122,7 @@ static List *get_qual_for_list(PartitionKey key, PartitionBoundSpec *spec);
 static List *get_qual_for_range(PartitionKey key, PartitionBoundSpec *spec);
 static Oid get_partition_operator(PartitionKey key, int col,
 					   StrategyNumber strategy, bool *need_relabel);
-static List *generate_partition_qual(Relation rel, bool recurse);
+static List *generate_partition_qual(Relation rel);
 
 static PartitionRangeBound *make_one_range_bound(PartitionKey key, int index,
 					 List *datums, bool lower);
@@ -914,13 +914,13 @@ get_qual_from_partbound(Relation rel, Relation parent, Node *bound)
  * Returns a list of partition quals
  */
 List *
-RelationGetPartitionQual(Relation rel, bool recurse)
+RelationGetPartitionQual(Relation rel)
 {
 	/* Quick exit */
 	if (!rel->rd_rel->relispartition)
 		return NIL;
 
-	return generate_partition_qual(rel, recurse);
+	return generate_partition_qual(rel);
 }
 
 /*
@@ -1480,7 +1480,7 @@ get_partition_operator(PartitionKey key, int col, StrategyNumber strategy,
  * into cache memory.
  */
 static List *
-generate_partition_qual(Relation rel, bool recurse)
+generate_partition_qual(Relation rel)
 {
 	HeapTuple	tuple;
 	MemoryContext oldcxt;
@@ -1501,8 +1501,8 @@ generate_partition_qual(Relation rel, bool recurse)
 	/* Quick copy */
 	if (rel->rd_partcheck)
 	{
-		if (parent->rd_rel->relispartition && recurse)
-			result = list_concat(generate_partition_qual(parent, true),
+		if (parent->rd_rel->relispartition)
+			result = list_concat(generate_partition_qual(parent),
 								 copyObject(rel->rd_partcheck));
 		else
 			result = copyObject(rel->rd_partcheck);
@@ -1528,11 +1528,11 @@ generate_partition_qual(Relation rel, bool recurse)
 	my_qual = get_qual_from_partbound(rel, parent, bound);
 
 	/* If requested, add parent's quals to the list (if any) */
-	if (parent->rd_rel->relispartition && recurse)
+	if (parent->rd_rel->relispartition)
 	{
 		List	   *parent_check;
 
-		parent_check = generate_partition_qual(parent, true);
+		parent_check = generate_partition_qual(parent);
 		result = list_concat(parent_check, my_qual);
 	}
 	else

src/backend/commands/tablecmds.c

@@ -13151,7 +13151,7 @@ ATExecAttachPartition(List **wqueue, Relation rel, PartitionCmd *cmd)
 	 */
 	partConstraint = list_concat(get_qual_from_partbound(attachRel, rel,
 														 cmd->bound),
-								 RelationGetPartitionQual(rel, true));
+								 RelationGetPartitionQual(rel));
 	partConstraint = (List *) eval_const_expressions(NULL,
 													 (Node *) partConstraint);
 	partConstraint = (List *) canonicalize_qual((Expr *) partConstraint);

src/backend/executor/execMain.c

@@ -1259,8 +1259,7 @@ InitResultRelInfo(ResultRelInfo *resultRelInfo,
 	resultRelInfo->ri_projectReturning = NULL;
 	if (load_partition_check)
 		resultRelInfo->ri_PartitionCheck =
-							RelationGetPartitionQual(resultRelationDesc,
-													 true);
+							RelationGetPartitionQual(resultRelationDesc);
 	/*
 	 * The following gets set to NULL unless we are initializing leaf
 	 * partitions for tuple-routing.

src/backend/optimizer/util/plancat.c

@@ -1228,7 +1228,7 @@ get_relation_constraints(PlannerInfo *root,
 	}
 
 	/* Append partition predicates, if any */
-	pcqual = RelationGetPartitionQual(relation, true);
+	pcqual = RelationGetPartitionQual(relation);
 	if (pcqual)
 	{
 		/*

src/include/catalog/partition.h

@@ -77,7 +77,7 @@ extern bool partition_bounds_equal(PartitionKey key,
 extern void check_new_partition_bound(char *relname, Relation parent, Node *bound);
 extern Oid get_partition_parent(Oid relid);
 extern List *get_qual_from_partbound(Relation rel, Relation parent, Node *bound);
-extern List *RelationGetPartitionQual(Relation rel, bool recurse);
+extern List *RelationGetPartitionQual(Relation rel);
 
 /* For tuple routing */
 extern PartitionDispatch *RelationGetPartitionDispatchInfo(Relation rel,