zoudan commented on code in PR #3194:
URL: https://github.com/apache/calcite/pull/3194#discussion_r1189631187
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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:
Then we should handle null here? It seems a NPE Exception will be thrown?
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