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https://issues.apache.org/jira/browse/SPARK-1914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-1914.
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Resolution: Fixed
Fix Version/s: 1.0.0
> 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
> Fix For: 1.0.0
>
>
> {{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.
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