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https://issues.apache.org/jira/browse/HIVE-11752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15144978#comment-15144978
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Laljo John Pullokkaran commented on HIVE-11752:
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We need subsequent work to
1. link the top select in CTE with multiple down stream consumers
Calcite needs to handle this; within hive the wiring shouldn't be hard.
2. We need to enhance ColPruning/ PPD logic to work for multiple down stream op
pipeline
> Pre-materializing complex CTE queries
> -------------------------------------
>
> Key: HIVE-11752
> URL: https://issues.apache.org/jira/browse/HIVE-11752
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Affects Versions: 2.1.0
> Reporter: Navis
> Assignee: Jesus Camacho Rodriguez
> Priority: Minor
> Attachments: HIVE-11752.03.patch, HIVE-11752.04.patch,
> HIVE-11752.05.patch, HIVE-11752.1.patch.txt, HIVE-11752.2.patch.txt
>
>
> Currently, hive regards CTE clauses as a simple alias to the query block,
> which makes redundant works if it's used multiple times in a query. This
> introduces a reference threshold for pre-materializing the CTE clause as a
> volatile table (which is not exists in any form of metastore and just
> accessible from QB).
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