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https://issues.apache.org/jira/browse/HIVE-6901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13968516#comment-13968516
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Xuefu Zhang commented on HIVE-6901:
-----------------------------------
Actually HIVE-3925, while closely related to this, is concerned with stage
dependency. This JIRA is concerned with the plan manifesting for the fetch
stage. Thus, they seem orthogonal to each other.
It's nice to have both though.
> Explain plan doesn't show operator tree for the fetch operator
> --------------------------------------------------------------
>
> Key: HIVE-6901
> URL: https://issues.apache.org/jira/browse/HIVE-6901
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.12.0
> Reporter: Xuefu Zhang
> Assignee: Xuefu Zhang
> Priority: Minor
> Attachments: HIVE-6901.1.patch, HIVE-6901.patch
>
>
> Explaining a simple select query that involves a MR phase doesn't show
> processor tree for the fetch operator.
> {code}
> hive> explain select d from test;
> OK
> STAGE DEPENDENCIES:
> Stage-1 is a root stage
> Stage-0 is a root stage
> STAGE PLANS:
> Stage: Stage-1
> Map Reduce
> Map Operator Tree:
> ...
> Stage: Stage-0
> Fetch Operator
> limit: -1
> {code}
> It would be nice if the operator tree is shown even if there is only one node.
> Please note that in local execution, the operator tree is complete:
> {code}
> hive> explain select * from test;
> OK
> STAGE DEPENDENCIES:
> Stage-0 is a root stage
> STAGE PLANS:
> Stage: Stage-0
> Fetch Operator
> limit: -1
> Processor Tree:
> TableScan
> alias: test
> Statistics: Num rows: 8 Data size: 34 Basic stats: COMPLETE Column
> stats: NONE
> Select Operator
> expressions: d (type: int)
> outputColumnNames: _col0
> Statistics: Num rows: 8 Data size: 34 Basic stats: COMPLETE
> Column stats: NONE
> ListSink
> {code}
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