NobiGo commented on code in PR #3296:
URL: https://github.com/apache/calcite/pull/3296#discussion_r1254524763
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core/src/test/java/org/apache/calcite/rex/RexProgramTest.java:
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@@ -2458,6 +2458,79 @@ private SqlOperator getNoDeterministicOperator() {
checkSimplifyUnchanged(isNull(cast(vVarcharNotNull(), tInt(false))));
}
+ /** Unit test for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-5769";>[CALCITE-5769]
+ * Optimizing 'CAST(e AS t) IS NOT NULL' to 'e IS NOT NULL'</a>. */
+ @Test void testSimplifyCastIsNull3() {
+ // "(cast A as bigint) IS NULL" when A is int and A is not null
+ // ==>
+ // "false"
+ checkSimplify(isNull(cast(vIntNotNull(), tBigInt(false))), "false");
+ // "(cast A as smallint) IS NULL" when A is int and A is not null
+ // ==>
+ // "(cast A as smallint) IS NULL"
+ checkSimplifyUnchanged(isNull(cast(vIntNotNull(), tSmallInt(false))));
+ // "(cast A as varbinary) IS NULL" when A is varchar and A is not null
+ // ==>
+ // "(cast A as varbinary) IS NULL"
+ checkSimplifyUnchanged(isNotNull(cast(vVarcharNotNull(),
tVarbinary(false))));
+ }
+
+ /** Unit test for
+ * <a
href="https://issues.apache.org/jira/browse/CALCITE-5769";>[CALCITE-5769]
+ * Optimizing 'CAST(e AS t) IS NOT NULL' to 'e IS NOT NULL'</a>. */
+ @Test void testSimplifyCastIsNull4() {
+ // "(cast A as bigint) IS NULL" when A is int and A is nullable
+ // ==>
+ // "A IS NULL"
Review Comment:
Because A is nullable(Possible include NULL value). For example:
When A is a 5, the expression value will be false.
If A is NULL, the expression value will be true.
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