ILuffZhe commented on code in PR #4431:
URL: https://github.com/apache/calcite/pull/4431#discussion_r2161497204
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testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
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@@ -2565,6 +2568,17 @@ private static void checkConcatFunc(SqlOperatorFixture
f) {
f.checkString("concat('', '', 'a')", "a", "VARCHAR(1) NOT NULL");
f.checkString("concat('', '', '')", "", "VARCHAR(0) NOT NULL");
f.checkFails("^concat()^", INVALID_ARGUMENTS_NUMBER, false);
+
+ // test for ByteString
+ f.checkString("concat(x'61',x'62')", "0x6162", "VARCHAR(2) NOT NULL");
+ f.checkString("concat(cast(x'61' as binary), cast(x'62' as binary), "
+ + "cast(x'63' as binary))", "0x616263", "VARCHAR(3) NOT NULL");
Review Comment:
I'm not sure if changing it to VARCHAR_NULLABLE is suitable, can we get
binary's precision in ReturnTypes?
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