Hanumath Rao Maduri created DRILL-6545:
------------------------------------------
Summary: Projection Push down into Lateral Join operator.
Key: DRILL-6545
URL: https://issues.apache.org/jira/browse/DRILL-6545
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 1.13.0
Reporter: Hanumath Rao Maduri
Assignee: Hanumath Rao Maduri
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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
