[GitHub] [calcite] liuyongvs commented on a diff in pull request #3194: [CALCITE-5695] Add MAP_KEYS, MAP_VALUES function (enabled in Spark li…

["liuyongvs (via GitHub)" <gi...@apache.org>]

liuyongvs commented on code in PR #3194:
URL: https://github.com/apache/calcite/pull/3194#discussion_r1189605267


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core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
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@@ -3797,6 +3798,16 @@ public static List distinct(List list) {
     return new ArrayList<>(result);
   }
 
+  /** Support the MAP_KEYS function. */
+  public static List mapKeys(Map map) {
+    return (List) map.keySet().stream().collect(Collectors.toList());

Review Comment:
   return null @zoudan 



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