mihaibudiu commented on code in PR #3869:
URL: https://github.com/apache/calcite/pull/3869#discussion_r1685047337
##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
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@@ -10857,6 +10857,7 @@ void assertSubFunReturns(boolean binary, String s, int
start,
f.checkFails("trim('' from 'abcde')",
"Trim error: trim character must be exactly 1 character",
true);
+ f.checkFails("trim()", "String to trim cannot be null", false);
Review Comment:
Is this the expected error for this function?
Or should the result be null?
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