[GitHub] imay commented on a change in pull request #299: Fix failed cases in regression test

[GitBox <gi...@apache.org>]

imay commented on a change in pull request #299: Fix failed cases in regression test
URL: https://github.com/apache/incubator-doris/pull/299#discussion_r232519382
 
 

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 File path: fe/src/main/java/org/apache/doris/rewrite/FoldConstantsRule.java
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 @@ -58,14 +64,14 @@
 public class FoldConstantsRule implements ExprRewriteRule {
     public static ExprRewriteRule INSTANCE = new FoldConstantsRule();
 
-    private Multimap<String, FEFunctionInvoker> functions = ArrayListMultimap.create();
+    private ImmutableMultimap<String, FEFunctionInvoker> functions;
+    private ImmutableSet<String> nonNullResultWithNullParamFunctions;
 
 Review comment:
   Need more comment here. I'm not very clear about this attribute's purpose

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