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From "Pengcheng Xiong (JIRA)" <>
Subject [jira] [Updated] (HIVE-9780) Add another level of explain for RDBMS audience
Date Sat, 28 Mar 2015 04:07:53 GMT


Pengcheng Xiong updated HIVE-9780:
    Attachment: HIVE-9780.06.patch

following [~mmokhtar]'s suggestion, add cbo info for this explain. cc'ing [~jpullokkaran].

> Add another level of explain for RDBMS audience
> -----------------------------------------------
>                 Key: HIVE-9780
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>            Priority: Minor
>         Attachments: HIVE-9780.01.patch, HIVE-9780.02.patch, HIVE-9780.03.patch, HIVE-9780.04.patch,
HIVE-9780.05.patch, HIVE-9780.06.patch
> Current Hive Explain (default) is targeted at MR Audience. We need a new level of explain
plan to be targeted at RDBMS audience. The explain requires these:
> 1) The focus needs to be on what part of the query is being executed rather than internals
of the engines
> 2) There needs to be a clearly readable tree of operations
> 3) Examples - Table scan should mention the table being scanned, the Sarg, the size of
table and expected cardinality after the Sarg'ed read. The join should mention the table being
joined with and the join condition. The aggregate should mention the columns in the group-by.

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