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https://issues.apache.org/jira/browse/IMPALA-13074?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noemi Pap-Takacs updated IMPALA-13074:
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Description:
The query plan shows the nodes that take part in the execution, forming a tree
structure.
It can be displayed in the CLI by issuing the EXPLAIN <query> command. When the
actual query is executed, the plan tree can also be viewed in the Impala Web UI
in a graphic form.
However, the explain string and the graphic plan tree does not match: the top
node is missing from the Web UI.
This is especially confusing in case of DDL and DML statements, where the Data
Sink is not displayed. This makes a SELECT * FROM table indistinguishable from
a CREATE TABLE AS SELECT, since both only displays the SCAN node and omit the
WRITE_TO_HDFS and SELECT node.
It would make sense to include the WRITE_TO_HDFS node in DML/DDL plans.
was:
The query plan shows the nodes that take part in the execution, forming a tree
structure.
It can be displayed in the CLI by issuing the EXPLAIN <query> command. When the
actual query is executed, the plan tree can also be viewed in the Impala Web UI
in a graphic form.
However, the explain string and the graphic plan tree does not match: the top
node is missing from the Web UI.
This is especially confusing in case of DDL and DML statements, where the Data
Sink is not displayed. This makes a SELECT * FROM table indistinguishable from
a CREATE TABLE, since both only displays the SCAN node and omit the
WRITE_TO_HDFS and SELECT node.
It would make sense to include the WRITE_TO_HDFS node in DML/DDL plans.
> WRITE TO HDFS node is omitted from Web UI graphic plan
> ------------------------------------------------------
>
> Key: IMPALA-13074
> URL: https://issues.apache.org/jira/browse/IMPALA-13074
> Project: IMPALA
> Issue Type: Bug
> Reporter: Noemi Pap-Takacs
> Priority: Major
> Labels: ramp-up
>
> The query plan shows the nodes that take part in the execution, forming a
> tree structure.
> It can be displayed in the CLI by issuing the EXPLAIN <query> command. When
> the actual query is executed, the plan tree can also be viewed in the Impala
> Web UI in a graphic form.
> However, the explain string and the graphic plan tree does not match: the top
> node is missing from the Web UI.
> This is especially confusing in case of DDL and DML statements, where the
> Data Sink is not displayed. This makes a SELECT * FROM table
> indistinguishable from a CREATE TABLE AS SELECT, since both only displays the
> SCAN node and omit the WRITE_TO_HDFS and SELECT node.
> It would make sense to include the WRITE_TO_HDFS node in DML/DDL plans.
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