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)