[
https://issues.apache.org/jira/browse/SPARK-1914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14008629#comment-14008629
]
Cheng Lian commented on SPARK-1914:
-----------------------------------
Added steps to reproduce this bug in {{sbt hive/console}}.
> Simplify CountFunction not to traverse to evaluate all child expressions.
> -------------------------------------------------------------------------
>
> Key: SPARK-1914
> URL: https://issues.apache.org/jira/browse/SPARK-1914
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Takuya Ueshin
>
> {{CountFunction}} should count up only if the child's evaluated value is not
> null.
> Because it traverses to evaluate all child expressions, even if the child is
> null, it counts up if one of the all children is not null.
> To reproduce this bug in {{sbt hive/console}}:
> {code}
> scala> hql("SELECT COUNT(*) FROM src1").collect()
> res1: Array[org.apache.spark.sql.Row] = Array([25])
> scala> hql("SELECT COUNT(*) FROM src1 WHERE key IS NULL").collect()
> res2: Array[org.apache.spark.sql.Row] = Array([10])
> scala> hql("SELECT COUNT(key + 1) FROM src1").collect()
> res3: Array[org.apache.spark.sql.Row] = Array([25])
> {code}
> {{res3}} should be 15 since there are 10 null keys.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
