David Mollitor created HIVE-24833:
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Summary: Hive Should Only Pushdown EQ Predicate on
HBaseStorageHandler
Key: HIVE-24833
URL: https://issues.apache.org/jira/browse/HIVE-24833
Project: Hive
Issue Type: Improvement
Reporter: David Mollitor
I believe that a Hive query with an HBase Storage Handler is incorrectly
applies a predicate pushdown into the storage handler.
I observed a FETCH optimization that took a long time to complete because it
was performing a table scan across the entire HBase table.
The only case in which a predicate should be pushed down the storage layer is
for
`SELECT * FROM TABLE my_hbase_table WHERE row_key=?`
This would be appropriate (EQ on the row key). Anything else will involve a
scan of the table and there is no way to easily calculate how small a scan it
will require and therefore should always be passed to the compute engine (Tez).
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