JiajunBernoulli commented on code in PR #3260:
URL: https://github.com/apache/calcite/pull/3260#discussion_r1230337215
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testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
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@@ -5334,6 +5334,33 @@ private static void checkIf(SqlOperatorFixture f) {
f.checkScalar("rand_integer(2, 11)", 1, "INTEGER NOT NULL");
}
+ /** Tests {@code ARRAY_APPEND} function from Spark. */
+ @Test void testArrayAppendFunc() {
+ final SqlOperatorFixture f0 = fixture();
+ f0.setFor(SqlLibraryOperators.ARRAY_APPEND);
+ f0.checkFails("^array_append(array[1], 2)^",
+ "No match found for function signature ARRAY_APPEND\\("
+ + "<INTEGER ARRAY>, <NUMERIC>\\)", false);
+
+ final SqlOperatorFixture f = f0.withLibrary(SqlLibrary.SPARK);
+ f.checkScalar("array_append(array[1], 2)", "[1, 2]",
+ "INTEGER NOT NULL ARRAY NOT NULL");
+ f.checkScalar("array_append(array[1], null)", "[1, null]",
+ "INTEGER ARRAY NOT NULL");
+ f.checkScalar("array_append(array(null), null)", "[null, null]",
+ "NULL ARRAY NOT NULL");
+ f.checkScalar("array_append(array(), null)", "[null]",
Review Comment:
Can we append integer or string to `array_append(array(), null)`?
(The `UNKNOWN` type maybe trick.）
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