rubenada commented on code in PR #3237:
URL: https://github.com/apache/calcite/pull/3237#discussion_r1219416934
##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
##########
@@ -5468,6 +5468,27 @@ private static void checkIf(SqlOperatorFixture f) {
f.checkNull("array_length(null)");
}
+ @Test void testArrayToStringFunc() {
+ final SqlOperatorFixture f0 = fixture();
+ f0.setFor(SqlLibraryOperators.ARRAY_TO_STRING);
+ f0.checkFails("^array_to_string(array['aa', 'b', 'c'], '-')^", "No match
found for function"
+ + " signature ARRAY_TO_STRING\\(<CHAR\\(2\\) ARRAY>, <CHARACTER>\\)",
false);
+
+ final SqlOperatorFixture f = f0.withLibrary(SqlLibrary.BIG_QUERY);
+ f.checkScalar("array_to_string(array['aa', 'b', 'c'], '-')", "aa-b-c",
+ "VARCHAR NOT NULL");
+ f.checkScalar("array_to_string(array[null, 'aa', null, 'b', null], '-',
'empty')",
+ "empty-aa-empty-b-empty", "VARCHAR NOT NULL");
+ f.checkScalar("array_to_string(array[null, 'aa', null, 'b', null], '-')",
"aa-b",
+ "VARCHAR NOT NULL");
+ f.checkScalar("array_to_string(array[null, x'aa', null, x'bb', null],
'-')", "aa-bb",
+ "VARCHAR NOT NULL");
+ f.checkNull("array_to_string(null, '-')");
+ f.checkNull("array_to_string(array['a', 'b', null], null)");
Review Comment:
Is this expected? Having a `null` delimiter shall lead to `null` result?
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