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https://issues.apache.org/jira/browse/DRILL-6545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16528523#comment-16528523
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ASF GitHub Bot commented on DRILL-6545:
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HanumathRao commented on issue #1347: DRILL-6545: Projection Push down into
Lateral Join operator.
URL: https://github.com/apache/drill/pull/1347#issuecomment-401513962
@amansinha100 Thank you for the review.
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> Projection Push down into Lateral Join operator.
> ------------------------------------------------
>
> Key: DRILL-6545
> URL: https://issues.apache.org/jira/browse/DRILL-6545
> Project: Apache Drill
> Issue Type: Improvement
> Components: Query Planning & Optimization
> Reporter: Hanumath Rao Maduri
> Assignee: Hanumath Rao Maduri
> Priority: Major
> Labels: ready-to-commit
> Fix For: 1.14.0
>
>
> For the Lateral’s logical and physical plan node, we would need to add an
> output RowType such that a Projection can be pushed down to Lateral.
> Currently, Lateral will produce all columns from left and right and it
> depends on a subsequent Project to eliminate unneeded columns. However, this
> will blow up the memory use of Lateral since each column from the left will
> be replicated N times based on N rows coming from UNNEST. We can have a
> ProjectLateralPushdownRule that pushes only the plain columns onto LATERAL
> but keeps the expression evalulations as part of the Project above the
> Lateral.
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