Zoltán Borók-Nagy created IMPALA-8883:
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Summary: 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
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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