zoudan commented on code in PR #3262:
URL: https://github.com/apache/calcite/pull/3262#discussion_r1241483640
##########
core/src/main/java/org/apache/calcite/runtime/SqlFunctions.java:
##########
@@ -3984,6 +3985,13 @@ public static List sortArray(List list, boolean
ascending) {
return list;
}
+ /** Support the MAP_CONCAT function. */
+ public static Map mapConcat(Map... maps) {
+ final Map result = new LinkedHashMap();
+ Arrays.stream(maps).forEach(result::putAll);
Review Comment:
I have an impression that lambda expressions have performance issues in
certain scenarios in jdk8, but I haven't found clear evidence yet, so it is ok
if you want to keep it.
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