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Posted to issues@hive.apache.org by "Alan Gates (JIRA)" <ji...@apache.org> on 2015/11/05 17:44:27 UTC
[jira] [Assigned] (HIVE-10804) CBO: Calcite Operator To Hive
Operator (Calcite Return Path): optimizer for limit 0 does not work
[ https://issues.apache.org/jira/browse/HIVE-10804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Alan Gates reassigned HIVE-10804:
---------------------------------
Assignee: Alan Gates (was: Pengcheng Xiong)
> CBO: Calcite Operator To Hive Operator (Calcite Return Path): optimizer for limit 0 does not work
> -------------------------------------------------------------------------------------------------
>
> Key: HIVE-10804
> URL: https://issues.apache.org/jira/browse/HIVE-10804
> Project: Hive
> Issue Type: Sub-task
> Components: CBO
> Reporter: Pengcheng Xiong
> Assignee: Alan Gates
> Fix For: 1.2.0
>
> Attachments: HIVE-10804.01.patch
>
>
> {code}
> explain
> select key,value from src order by key limit 0
> POSTHOOK: type: QUERY
> STAGE DEPENDENCIES:
> Stage-1 is a root stage
> Stage-0 depends on stages: Stage-1
> STAGE PLANS:
> Stage: Stage-1
> Map Reduce
> Map Operator Tree:
> TableScan
> alias: src
> Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats: NONE
> Select Operator
> expressions: key (type: string), value (type: string)
> outputColumnNames: key, value
> Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats: NONE
> Reduce Output Operator
> key expressions: key (type: string)
> sort order: +
> Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats: NONE
> value expressions: value (type: string)
> Reduce Operator Tree:
> Select Operator
> expressions: KEY.reducesinkkey0 (type: string), VALUE.value (type: string)
> outputColumnNames: key, value
> Statistics: Num rows: 500 Data size: 5312 Basic stats: COMPLETE Column stats: NONE
> Limit
> Number of rows: 0
> Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
> File Output Operator
> compressed: false
> Statistics: Num rows: 0 Data size: 0 Basic stats: NONE Column stats: NONE
> table:
> input format: org.apache.hadoop.mapred.TextInputFormat
> output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
> serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
> {code}
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