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https://issues.apache.org/jira/browse/SPARK-1938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14009555#comment-14009555
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Takuya Ueshin commented on SPARK-1938:
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PRed: https://github.com/apache/spark/pull/893
> ApproxCountDistinctMergeFunction should return Int value.
> ---------------------------------------------------------
>
> Key: SPARK-1938
> URL: https://issues.apache.org/jira/browse/SPARK-1938
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Takuya Ueshin
>
> {{ApproxCountDistinctMergeFunction}} should return {{Int}} value because the
> {{dataType}} of {{ApproxCountDistinct}} is {{IntegerType}}.
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