slim bouguerra created HIVE-19684:
-------------------------------------
Summary: Hive stats optimizer wrongly uses stats against non
native tables
Key: HIVE-19684
URL: https://issues.apache.org/jira/browse/HIVE-19684
Project: Hive
Issue Type: Bug
Reporter: slim bouguerra
Assignee: slim bouguerra
Stats of non native tables are inaccurate, thus queries over non native tables
can not optimized by stats optimizer.
Take example of query
{code}
Explain select count(*) from (select `__time` from druid_test_table limit 1) as
src ;
{code}
the plan will be reduced to
{code}
POSTHOOK: query: explain extended select count(*) from (select `__time` from
druid_test_table limit 1) as src
POSTHOOK: type: QUERY
STAGE DEPENDENCIES:
Stage-0 is a root stage
STAGE PLANS:
Stage: Stage-0
Fetch Operator
limit: 1
Processor Tree:
ListSink
{code}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
