ILuffZhe commented on code in PR #3258:
URL: https://github.com/apache/calcite/pull/3258#discussion_r1232360225
##########
core/src/test/resources/sql/functions.iq:
##########
@@ -499,6 +510,120 @@ select CONVERT(DATE, '05/01/2000', 103);
!ok
!}
+# [CALCITE-5771] Apply two different NULL semantics for CONCAT
function(enabled in MySQL, Postgresql, BigQuery and MSSQL)
+select concat(null);
++--------+
+| EXPR$0 |
++--------+
+| |
++--------+
+(1 row)
+
+!ok
+
+select concat(null, '');
++--------+
+| EXPR$0 |
++--------+
+| |
++--------+
+(1 row)
+
+!ok
+
+select concat('', '');
++--------+
+| EXPR$0 |
++--------+
+| |
Review Comment:
As far as I know, we cannot distinguish them in functions.iq(null and ""
behave the same since we don't use (null) for NULL result here). But we can
tell the difference in SqlOperatorTest.
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