Navis created HIVE-9341:
---------------------------
Summary: Apply ColumnPrunning for noop PTFs
Key: HIVE-9341
URL: https://issues.apache.org/jira/browse/HIVE-9341
Project: Hive
Issue Type: Improvement
Components: PTF-Windowing
Reporter: Navis
Assignee: Navis
Priority: Trivial
Currently, PTF disables CP optimization, which can make a huge burden. For
example,
{noformat}
select p_mfgr, p_name, p_size,
rank() over (partition by p_mfgr order by p_name) as r,
dense_rank() over (partition by p_mfgr order by p_name) as dr,
sum(p_retailprice) over (partition by p_mfgr order by p_name rows between
unbounded preceding and current row) as s1
from noop(on part
partition by p_mfgr
order by p_name
);
STAGE PLANS:
Stage: Stage-1
Map Reduce
Map Operator Tree:
TableScan
alias: part
Statistics: Num rows: 26 Data size: 3147 Basic stats: COMPLETE
Column stats: NONE
Reduce Output Operator
key expressions: p_mfgr (type: string), p_name (type: string)
sort order: ++
Map-reduce partition columns: p_mfgr (type: string)
Statistics: Num rows: 26 Data size: 3147 Basic stats: COMPLETE
Column stats: NONE
value expressions: p_partkey (type: int), p_name (type: string),
p_mfgr (type: string), p_brand (type: string), p_type (type: string), p_size
(type: int), p_container (type: string), p_retailprice (type: double),
p_comment (type: string), BLOCK__OFFSET__INSIDE__FILE (type: bigint),
INPUT__FILE__NAME (type: string), ROW__ID (type:
struct<transactionid:bigint,bucketid:int,rowid:bigint>)
...
{noformat}
There should be a generic way to discern referenced columns but before that, we
know CP can be safely applied to noop functions.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
