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https://issues.apache.org/jira/browse/HIVE-7324?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14069757#comment-14069757
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Harish Butani commented on HIVE-7324:
-------------------------------------
The issue is MetadataImporter only works on an empty DB, otherwise you get into
id issues: ids imported from export files intersect with ids in the metastore.
To get this to work through QTestUtil I can look into having it react to a flag
such that it either Imports the schema or invokes createSources.
But this still would not get to what you were trying to do: you will only be
run these tests along with other .q tests in one go.
> 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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