diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index 017cafb..0bd8bc9 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -966,9 +966,6 @@ set_append_rel_size(PlannerInfo *root, RelOptInfo *rel,
 			continue;
 		}
 
-		/* Copy consider_parallel flag from parent. */
-		childrel->consider_parallel = rel->consider_parallel;
-
 		/*
 		 * CE failed, so finish copying/modifying targetlist and join quals.
 		 *
@@ -989,6 +986,24 @@ set_append_rel_size(PlannerInfo *root, RelOptInfo *rel,
 								   appinfo);
 
 		/*
+		 * baserestrictinfo or reltarget for childrel may have been modified,
+		 * so check if any one of those contains parallel-restricted clause.
+		 * Even if one of the child rels is not parallel safe, parent rel
+		 * should not be considred for parallelization.
+		 */
+		if (root->glob->parallelModeOK && rel->consider_parallel)
+		{
+			if (has_parallel_hazard((Node *) childrel->baserestrictinfo, false) ||
+				has_parallel_hazard((Node *) childrel->reltarget->exprs, false))
+			{
+				childrel->consider_parallel = false;
+				rel->consider_parallel = false;
+			}
+			else
+				childrel->consider_parallel = true;
+		}
+
+		/*
 		 * We have to make child entries in the EquivalenceClass data
 		 * structures as well.  This is needed either if the parent
 		 * participates in some eclass joins (because we will want to consider
@@ -1250,7 +1265,7 @@ set_append_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
 	/*
 	 * Consider an append of partial unordered, unparameterized partial paths.
 	 */
-	if (partial_subpaths_valid)
+	if (partial_subpaths_valid && rel->consider_parallel)
 	{
 		AppendPath *appendpath;
 		ListCell   *lc;