xuzifu666 commented on code in PR #5295:
URL: https://github.com/apache/calcite/pull/5295#discussion_r4124102342
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core/src/main/java/org/apache/calcite/rex/RexSimplify.java:
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@@ -2013,11 +2013,13 @@ private <C extends Comparable<C>> RexNode
simplifyAnd2ForUnknownAsFalse(
// Simplify BOOLEAN expressions if possible
while (term.getKind() == SqlKind.EQUALS) {
RexCall call = (RexCall) term;
- if (call.getOperands().get(0).isAlwaysTrue()) {
+ if (call.getOperands().get(0).isAlwaysTrue()
+ && call.getOperands().get(1).getType().getSqlTypeName() ==
SqlTypeName.BOOLEAN) {
Review Comment:
Thanks for the suggestion @julianhyde . `isAlwaysTrue` / `isAlwaysFalse` are
already defensive: both `RexLiteral` and `RexCall` return false unless the
expression has BOOLEAN type, so the string literal 'true' already returns
false.The call-site check guards the other operand (the one that would replace
the =` term), so it can't be pushed intoisAlwaysTrue. Without it,AND(=(x,
TRUE), ...)with VARCHAR x would simplify toAND(x, ...) which is the
CALCITE-5907 bug. Please correct me if I am wrong～
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