herunkang2018 commented on code in PR #3211:
URL: https://github.com/apache/calcite/pull/3211#discussion_r1199514939
##########
core/src/test/java/org/apache/calcite/test/SqlValidatorTest.java:
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@@ -1042,6 +1042,10 @@ void testDyadicCollateOperator() {
.columnType("VARCHAR(1) NOT NULL");
expr("substring('a', 1, '3')")
.columnType("VARCHAR(1) NOT NULL");
+
+ expr("SUBSTRING(NULL FROM 1 FOR 2)").ok();
Review Comment:
this test case is not effected by this issue, would you like to add a
comment to clarify it?
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