Avoid useless "x = ANY(ARRAY[])" test for empty partition list.
This arises in practice if the partition only admits NULL values. Jeevan Ladhe Discussion: https://postgr.es/m/CAOgcT0OChrN--uuqH6wG6Z8+nxnCWJ+2Q-uhnK4KOANdRRxuAw@mail.gmail.com
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@ -1311,6 +1311,12 @@ get_qual_for_list(PartitionKey key, PartitionBoundSpec *spec)
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List *arrelems = NIL;
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bool list_has_null = false;
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/*
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* Only single-column list partitioning is supported, so we are worried
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* only about the partition key with index 0.
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*/
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Assert(key->partnatts == 1);
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/* Construct Var or expression representing the partition column */
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if (key->partattrs[0] != 0)
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keyCol = (Expr *) makeVar(1,
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@ -1333,20 +1339,28 @@ get_qual_for_list(PartitionKey key, PartitionBoundSpec *spec)
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arrelems = lappend(arrelems, copyObject(val));
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}
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/* Construct an ArrayExpr for the non-null partition values */
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arr = makeNode(ArrayExpr);
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arr->array_typeid = !type_is_array(key->parttypid[0])
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? get_array_type(key->parttypid[0])
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: key->parttypid[0];
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arr->array_collid = key->parttypcoll[0];
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arr->element_typeid = key->parttypid[0];
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arr->elements = arrelems;
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arr->multidims = false;
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arr->location = -1;
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if (arrelems)
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{
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/* Construct an ArrayExpr for the non-null partition values */
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arr = makeNode(ArrayExpr);
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arr->array_typeid = !type_is_array(key->parttypid[0])
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? get_array_type(key->parttypid[0])
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: key->parttypid[0];
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arr->array_collid = key->parttypcoll[0];
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arr->element_typeid = key->parttypid[0];
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arr->elements = arrelems;
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arr->multidims = false;
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arr->location = -1;
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/* Generate the main expression, i.e., keyCol = ANY (arr) */
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opexpr = make_partition_op_expr(key, 0, BTEqualStrategyNumber,
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keyCol, (Expr *) arr);
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/* Generate the main expression, i.e., keyCol = ANY (arr) */
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opexpr = make_partition_op_expr(key, 0, BTEqualStrategyNumber,
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keyCol, (Expr *) arr);
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}
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else
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{
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/* If there are no partition values, we don't need an = ANY expr */
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opexpr = NULL;
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}
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if (!list_has_null)
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{
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@ -1361,7 +1375,7 @@ get_qual_for_list(PartitionKey key, PartitionBoundSpec *spec)
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nulltest->argisrow = false;
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nulltest->location = -1;
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result = list_make2(nulltest, opexpr);
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result = opexpr ? list_make2(nulltest, opexpr) : list_make1(nulltest);
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}
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else
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{
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@ -1369,16 +1383,21 @@ get_qual_for_list(PartitionKey key, PartitionBoundSpec *spec)
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* Gin up a "col IS NULL" test that will be OR'd with the main
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* expression.
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*/
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Expr *or;
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nulltest = makeNode(NullTest);
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nulltest->arg = keyCol;
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nulltest->nulltesttype = IS_NULL;
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nulltest->argisrow = false;
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nulltest->location = -1;
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or = makeBoolExpr(OR_EXPR, list_make2(nulltest, opexpr), -1);
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result = list_make1(or);
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if (opexpr)
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{
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Expr *or;
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or = makeBoolExpr(OR_EXPR, list_make2(nulltest, opexpr), -1);
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result = list_make1(or);
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}
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else
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result = list_make1(nulltest);
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}
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return result;
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