Bikramjeet Vig ca55b5926e IMPALA-4236: Codegen CopyRows() for select nodes ...

Testing:
Added test case to verify that CopyRows in select node is successfully
codegened.
Improved test coverage for select node with limit.

Performance:
Queries used (num_nodes set to 1):
500 Predicates: select * from (select * from tpch_parquet.lineitem
limit 6001215) t1 where l_partkey > 10 and l_extendedprice > 10000 and
l_linenumber > 1 and l_comment >'foo0' .... and l_comment >'foo500'
order by l_orderkey limit 10;

1 Predicate: select * from (select * from tpch_parquet.lineitem
limit 6001215) t1 where l_partkey > 10 order by l_orderkey limit 10;

+--------------+-----------------------------------------------------+
|              |      500 Predicates      |       1 Predicate        |
|              +------------+-------------+------------+-------------+
|              |   After    |   Before    |   After    |   Before    |
+--------------+------------+-------------+------------+-------------+
| Select Node  | 12s385ms   | 1m1s        | 234ms      | 797ms       |
| Codegen time | 2s619ms    | 1s962ms     | 200ms      | 181ms       |
+--------------+------------+-------------+------------+-------------+

Change-Id: Ie0d496d004418468e16b6f564f90f45ebbf87c1e
Reviewed-on: http://gerrit.cloudera.org:8080/8196
Reviewed-by: Bikramjeet Vig <bikramjeet.vig@cloudera.com>
Tested-by: Impala Public Jenkins

2017-10-25 01:17:28 +00:00

2.3 KiB

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