caicancai commented on code in PR #3706:
URL: https://github.com/apache/calcite/pull/3706#discussion_r1503587080


##########
testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
##########
@@ -6268,6 +6268,18 @@ void checkRegexpExtract(SqlOperatorFixture f0, 
FunctionAlias functionAlias) {
     f.checkScalar("rand_integer(2, 11)", 1, "INTEGER NOT NULL");
   }
 
+  /** Test case for <a 
href="https://issues.apache.org/jira/browse/CALCITE-6283";>
+   * [CALCITE-6283] Function array_append with a NULL array argument crashes 
with
+   * NullPointerException</a>. */
+  @Test void testArrayNullFunc() {
+    final SqlOperatorFixture f = fixture().withLibrary(SqlLibrary.SPARK);
+    f.checkNull("array_append(null, 2)");
+    f.checkNull("array_prepend(null, 2)");
+    f.checkNull("array_remove(null, 2)");
+    f.checkNull("array_contains(null, 2)");

Review Comment:
   My problem is that array_append is to adapt to spark, but array_append(null, 
2) of spark will report an error. Since it is to adapt to spark, why do I need 
to return null? Maybe higher spark versions have fixed it, do we need it? State 
this in the documentation



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