Navis created HIVE-4020:
---------------------------
Summary: Swap applying order of CP and PPD
Key: HIVE-4020
URL: https://issues.apache.org/jira/browse/HIVE-4020
Project: Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Navis
Assignee: Navis
Priority: Minor
Doing Hive-2340, I've found CP removed some column mapping needed for
backtracking expression desc. By swapping order of CP and PPD, the problem was
solved.
After that I've realized that CP on earlier stage is possible after PPD is
applied cause some columns on filter predicate are not selected and can be
removed right after the new pushed-down filter. For example, (bucketmapjoin1.q)
<code>
select /*+mapjoin(b)*/ a.key, a.value, b.value
from srcbucket_mapjoin_part a join srcbucket_mapjoin_part_2 b
on a.key=b.key where b.ds="2008-04-08"
<code>
plan for hashtable sink operator is changed to
<code>
HashTable Sink Operator
condition expressions:
0 {key} {value}
1 {value}
<code>
which was
<code>
HashTable Sink Operator
condition expressions:
0 {key} {value}
1 {value} {ds}
<code>
HIVE-2340 seemed need more time for commit, so booked as an another issue.
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