Get rid of unnecessary memory allocation in jsonb_subscript_assign()

Current code allocates memory for JsonbValue, but it could be placed locally.

diff --git a/src/backend/utils/adt/jsonbsubs.c b/src/backend/utils/adt/jsonbsubs.c
index cfb923aaa35cdfa0371b3fa3d3500edd349451a1..5868aad0578f0bb016a9d49e40da87145ca40d1d 100644 (file)
--- a/src/backend/utils/adt/jsonbsubs.c
+++ b/src/backend/utils/adt/jsonbsubs.c
@@ -283,7 +283,7 @@ jsonb_subscript_assign(ExprState *state,
     */
    if (*op->resnull)
    {
-       JsonbValue *newSource = (JsonbValue *) palloc(sizeof(JsonbValue));
+       JsonbValue  newSource;
 
        /*
         * To avoid any surprising results, set up an empty jsonb array in
@@ -292,17 +292,17 @@ jsonb_subscript_assign(ExprState *state,
         */
        if (workspace->expectArray)
        {
-           newSource->type = jbvArray;
-           newSource->val.array.nElems = 0;
-           newSource->val.array.rawScalar = false;
+           newSource.type = jbvArray;
+           newSource.val.array.nElems = 0;
+           newSource.val.array.rawScalar = false;
        }
        else
        {
-           newSource->type = jbvObject;
-           newSource->val.object.nPairs = 0;
+           newSource.type = jbvObject;
+           newSource.val.object.nPairs = 0;
        }
 
-       jsonbSource = JsonbValueToJsonb(newSource);
+       jsonbSource = JsonbValueToJsonb(&newSource);
        *op->resnull = false;
    }
    else