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Posted to issues-all@impala.apache.org by "Zoltán Borók-Nagy (Jira)" <ji...@apache.org> on 2019/08/22 15:08:00 UTC
[jira] [Updated] (IMPALA-8883) Update statistics of ACID tables
during writes
[ https://issues.apache.org/jira/browse/IMPALA-8883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zoltán Borók-Nagy updated IMPALA-8883:
--------------------------------------
Labels: impala-acid (was: )
> Update statistics of ACID tables during writes
> ----------------------------------------------
>
> Key: IMPALA-8883
> URL: https://issues.apache.org/jira/browse/IMPALA-8883
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Zoltán Borók-Nagy
> Priority: Major
> Labels: impala-acid
>
> When Impala INSERTs or TRUNCATEs an ACID table it simply removes the COLUMN_STATS_ACCURATE property to invalidate the statistics in order to prevent Hive using it.
> Instead of it Impala should properly update the statistics. It should be relatively simple for TRUNCATE since it erases all the data, but a bit more complicated for INSERT, e.g.:
> * Properly update _number of distinct values_
> * INSERT OVERWRITE partition should properly update table level _number of rows_.
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