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_r333917737
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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:
> we seem to be covered for this already by that the operators result is
nullable even if all the inputs are non-nullable
>
> ```java
> @Test public void testUnsafeSimplify1() {
> assertFalse(vIntNotNull(0).getType().isNullable());
> assertTrue(plus(vIntNotNull(0),
vIntNotNull(1)).getType().isNullable());
> RexCall c= (RexCall)isNotNull(plus(vIntNotNull(0), vIntNotNull(1)));
> assertFalse(c.isAlwaysFalse());
> assertFalse(c.isAlwaysTrue());
> }
> ```
the ' assertTrue(plus(vIntNotNull(0),
vIntNotNull(1)).getType().isNullable());' case will fail,
that I miss something ？
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