danny0405 commented on a change in pull request #1610: [CALCITE-3525]
RexSimplify: eliminate redundant rex calls in OR
URL: https://github.com/apache/calcite/pull/1610#discussion_r352262329
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File path:
core/src/main/java/org/apache/calcite/rel/rules/FilterProjectTransposeRule.java
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@@ -202,8 +202,9 @@ private RexNode simplifyFilterCondition(RexNode condition,
RelOptRuleCall call)
// 1>null evaluates to unknown and WHERE unknown behaves exactly like
WHERE false
RexSimplify simplifier =
new RexSimplify(xBuilder, RelOptPredicateList.EMPTY, executor);
- return RexUtil.removeNullabilityCast(
+ RexNode simplified = RexUtil.removeNullabilityCast(
xBuilder.getTypeFactory(),
simplifier.simplifyUnknownAsFalse(condition));
+ return simplified.isAlwaysFalse() ? condition : simplified;
Review comment:
Why we returns the original condition if the simplified node is always false
? Shouldn't we just return the simplified one ?
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