vlsi commented on a change in pull request #1044: [CALCITE-2838]
Simplification: Remove redundant IS TRUE/IS NOT FALSE …
URL: https://github.com/apache/calcite/pull/1044#discussion_r256836978
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File path: core/src/main/java/org/apache/calcite/rex/RexSimplify.java
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@@ -494,10 +494,16 @@ private RexNode simplifyNot(RexCall call, RexUnknownAs
unknownAs) {
return call;
}
- private RexNode simplifyIs(RexCall call) {
+ private RexNode simplifyIs(RexCall call, RexUnknownAs unknownAs) {
final SqlKind kind = call.getKind();
- final RexNode a = call.getOperands().get(0);
-
+ final RexNode argument = call.getOperands().get(0);
+ if (kind == SqlKind.IS_TRUE && unknownAs == RexUnknownAs.FALSE) {
+ return simplify(argument, unknownAs);
+ }
+ if (kind == SqlKind.IS_NOT_FALSE && unknownAs == RexUnknownAs.TRUE) {
+ return simplify(argument, unknownAs);
+ }
+ final RexNode a = simplify(call.getOperands().get(0),
RexUnknownAs.UNKNOWN);
Review comment:
This does look like `O(N^2)`.
Can you please avoid simplifying the same nodes again and again?
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