[GitHub] yucai edited a comment on issue #23821: [SPARK-26909][FOLLOWUP][SQL] use unsafeRow.hashCode() as hash value in HashAggregate

Mon, 18 Feb 2019 19:21:20 -0800 

yucai edited a comment on issue #23821: [SPARK-26909][FOLLOWUP][SQL] use 
unsafeRow.hashCode() as hash value in HashAggregate
URL: https://github.com/apache/spark/pull/23821#issuecomment-464628698
 
 
   Tests:
   ```
   spark.conf.set("spark.sql.shuffle.partitions", 8192)
   val df = spark.range(16 * 1024 * 1024).selectExpr("cast(id as string) as id")
   df.groupBy("id").agg(count("id")).collect
   ```
   
   Before:
   ```
       val hashExpr = Murmur3Hash(groupingExpressions, 42)
       val hashEval = BindReferences.bindReference(hashExpr, 
child.output).genCode(ctx)
   ```
   <img 
src="https://user-images.githubusercontent.com/2989575/52936535-663f1800-3397-11e9-81f4-ac7480c1f737.png";
 width="400" height="600">
   
   After:
   <img 
src="https://user-images.githubusercontent.com/2989575/52936524-617a6400-3397-11e9-94c0-0440a32ddf6f.png";
 width="400" height="600">
   
   
   

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