macroguo-ghy commented on code in PR #3587:
URL: https://github.com/apache/calcite/pull/3587#discussion_r1433619147


##########
core/src/test/java/org/apache/calcite/rel/rel2sql/RelToSqlConverterTest.java:
##########
@@ -7382,6 +7382,25 @@ private void checkLiteral2(String expression, String 
expected) {
     sql(sql6).ok(expected6);
   }
 
+  /** Test case for
+   * <a 
href="https://issues.apache.org/jira/browse/CALCITE-6116";>[CALCITE-6116]
+   * Add EXISTS function (enabled in Spark library)</a>. */
+  @Test void testExistsFunctionInSpark() {

Review Comment:
   Thanks for your review! You are correct that using the `any` type is 
inaccurate, and it would be better to use the element type of the array for 
type validation. I will fix it later.
   



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