From d9428d27fa1de540fbe35a519a0d8a27bee896fa Mon Sep 17 00:00:00 2001
From: gaodayue <gaodayue@meituan.com>
Date: Tue, 28 Aug 2018 18:45:57 +0800
Subject: [PATCH] RowBasedKeySerde should use empty dictionary in constructor

---
 .../query/groupby/epinephelinae/RowBasedGrouperHelper.java   | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/processing/src/main/java/io/druid/query/groupby/epinephelinae/RowBasedGrouperHelper.java b/processing/src/main/java/io/druid/query/groupby/epinephelinae/RowBasedGrouperHelper.java
index 2ae1dde0e97f..3acd2fd705ae 100644
--- a/processing/src/main/java/io/druid/query/groupby/epinephelinae/RowBasedGrouperHelper.java
+++ b/processing/src/main/java/io/druid/query/groupby/epinephelinae/RowBasedGrouperHelper.java
@@ -912,7 +912,6 @@ static long estimateStringKeySize(@Nullable String key)
 
   private static class RowBasedKeySerde implements Grouper.KeySerde<RowBasedGrouperHelper.RowBasedKey>
   {
-    private static final int DICTIONARY_INITIAL_CAPACITY = 10000;
     private static final int UNKNOWN_DICTIONARY_ID = -1;
 
     private final boolean includeTimestamp;
@@ -958,9 +957,9 @@ private static class RowBasedKeySerde implements Grouper.KeySerde<RowBasedGroupe
       this.valueTypes = valueTypes;
       this.limitSpec = limitSpec;
       this.enableRuntimeDictionaryGeneration = dictionary == null;
-      this.dictionary = enableRuntimeDictionaryGeneration ? new ArrayList<>(DICTIONARY_INITIAL_CAPACITY) : dictionary;
+      this.dictionary = enableRuntimeDictionaryGeneration ? new ArrayList<>() : dictionary;
       this.reverseDictionary = enableRuntimeDictionaryGeneration ?
-                               new Object2IntOpenHashMap<>(DICTIONARY_INITIAL_CAPACITY) :
+                               new Object2IntOpenHashMap<>() :
                                new Object2IntOpenHashMap<>(dictionary.size());
       this.reverseDictionary.defaultReturnValue(UNKNOWN_DICTIONARY_ID);
       this.maxDictionarySize = maxDictionarySize;