leonardBang commented on a change in pull request #1491: [CALCITE-3368] Some
problems simplifying ‘expression IS NULL’
URL: https://github.com/apache/calcite/pull/1491#discussion_r333886685
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File path: core/src/main/java/org/apache/calcite/rex/RexCall.java
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@@ -204,7 +204,7 @@ public RelDataType getType() {
// This reduction allows us to convert it to a semi-join.
switch (getKind()) {
case IS_NOT_NULL:
- return !operands.get(0).getType().isNullable();
+ return RexSimplify.isSafeExpression(this) &&
!operands.get(0).getType().isNullable();
Review comment:
@kgyrtkirk thanks for review,
If we don't change here, tests RexProgramTest#testSimplifyCondition and
RexProgramTest#testSimplifyCondition2
will fail after we change the IS_NOT_NULL behavior in RexSimplify.
Yes, the piece of code is called really frequently and will have higher
cost, so I wonder we should add a switch for these change.
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