Sahil Takiar created IMPALA-10083:
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Summary: Improve row count estimates when stats are not available
Key: IMPALA-10083
URL: https://issues.apache.org/jira/browse/IMPALA-10083
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Reporter: Sahil Takiar
There are various improvements that we can make to estimate row count stats
even if stats are not available for a table.
There are various factors to consider here:
* Handling for partitioned vs. non-partitioned tables
** Handling for partitioned tables can be a bit tricky if the table is in a
mixed state - some partitions have row counts while other don't
* Interoperability with other systems such as Hive and Spark
* Users can run alter table statements to manually set the value of the row
count
The JIRA will be used to track the various improvements via sub-tasks.
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