[jira] [Commented] (HIVE-7324) CBO: provide a mechanism to test CBO features based on table stats only (w/o table data)

["Gunther Hagleitner (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-7324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068877#comment-14068877 ] 

Gunther Hagleitner commented on HIVE-7324:
------------------------------------------

However, when I ran the tests they failed because the loading of the metastore failed some foreign key constraints.

> CBO: provide a mechanism to test CBO features based on table stats only (w/o table data)
> ----------------------------------------------------------------------------------------
>
>                 Key: HIVE-7324
>                 URL: https://issues.apache.org/jira/browse/HIVE-7324
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>         Attachments: HIVE-7324.1.patch, HIVE-7324.2.patch
>
>
> Since lot of the CBO work is focused on planning, it will be nice to be able to run explain query to test CBO features. TPCDS has a rich enough schema and query set. So the patch loads a dump TPCDS(Scale 10000) stats.
> 1. TestCBO shows a way to load stats from a dump and run explain on a tpcds query. The output is currently dumped to Sys.out. This can be improved by hooking to QTestUtil, but hopefully this is a good start.
> 2. Uncovered couple of issues in the process of testing this:
> a) PartitionPruner fails on 'true' constants. For e.g. you will get an error for 
> {code:sql}
> SELECT * 
> FROM t WHERE
> partCol < 100 AND true
> {code}
> This gets exposed because the predicates coming out of Optiq can contain 'true' predicates.
> b) OpTraitsRulesProcFactory:checkBucketedTable checks that number of files = numBuckets. This fails because there are no dataFiles. So I have altered it to catch exceptions and assume bucketMapJoinConvertible = false if an exception is encountered here.
> Uploading with these changes in this patch for now. Will carve them out as separate patches.
> [~ashutoshc], [~hagleitn] can you please take a look. 



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