xuzifu666 commented on code in PR #4431:
URL: https://github.com/apache/calcite/pull/4431#discussion_r2176455634
##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
##########
@@ -2545,6 +2545,30 @@ void testCastToBoolean(CastType castType,
SqlOperatorFixture f) {
f.checkNull("cast(null as integer array) || array[1]");
}
+ /** Test case for <a
href="https://issues.apache.org/jira/browse/CALCITE-7063";>
+ * Result type inferred for CONCAT_FUNCTION is incorrect for BINARY
arguments</a>. */
+ @Test void testConcatFuncMysql() {
+ final SqlOperatorFixture f = fixture().withLibrary(SqlLibrary.MYSQL);
+
+ // test for ByteString
+ f.setFor(SqlLibraryOperators.CONCAT_FUNCTION_MYSQL);
+ f.checkString("concat('a', x'61')", "6161", "BINARY(2) NOT NULL");
+ f.checkString("concat('abc', 'bb', 'cc')", "abcbbcc", "VARCHAR(7) NOT
NULL");
+ f.checkString("concat(x'616263',x'62')", "61626362", "BINARY(4) NOT NULL");
+ f.checkString("concat(x'616263','abc')", "616263616263", "BINARY(6) NOT
NULL");
+ f.checkString("concat(x'61',x'62')", "6162", "BINARY(2) NOT NULL");
+ f.checkString("concat(cast(x'61' as binary), cast(x'62' as binary), "
Review Comment:
Yes，literal is not a type. SqlTester itself does not calculate precision,
but it will call SqlReturnTypeInference##STRING_BYTESTRING_PRECISION to
calculate precision. It is called twice, once with origin sql, and the result
calculated by this method is completely correct. Then the second method will be
called again with a subquery to get another result. Both results need to match
the test case results to pass.
However, if it is (binary, char), the subquery cannot calculate the
precision correctly, so unless the varbinary type is returned, the results will
be inconsistent with the normal precision.
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