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https://issues.apache.org/jira/browse/SPARK-9592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14692830#comment-14692830
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Yin Huai commented on SPARK-9592:
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The last function based on AggregateExpression1 is broken. I am reopening it.
> Last implemented based on AggregateExpression1 are calculating the values for
> entire DataFrame partition not on GroupedData partition.
> --------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-9592
> URL: https://issues.apache.org/jira/browse/SPARK-9592
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.4.0
> Reporter: gaurav
> Priority: Minor
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> In current implementation, First and Last aggregates were calculating the
> values for entire DataFrame partition and then the same value was returned
> for all GroupedData in the partition.
> sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregates.scala
> Fixed the First and Last aggregates should compute first and last value per
> GroupedData instead of entire DataFrame.
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