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https://issues.apache.org/jira/browse/IMPALA-7919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16706095#comment-16706095
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Greg Rahn commented on IMPALA-7919:
-----------------------------------
Had a copy mistake in the description -- the 2nd example is the partitioned
one. We see that with the predicate we visit exactly one partition as expected
(partitions=1/2), but we do not include the predicate that restricted it to
that one partition.
I'm thinking it should be this:
{noformat}
00:SCAN HDFS [default.t1]
partitions=1/2 files=1 size=2B
predicates: default.t1.part_key = 42{noformat}
> Add predicates line in plan output for partition key predicates
> ---------------------------------------------------------------
>
> Key: IMPALA-7919
> URL: https://issues.apache.org/jira/browse/IMPALA-7919
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Reporter: Greg Rahn
> Priority: Major
>
> When there is a predicate on a partitioned table's partition key column the
> SCAN node does not print the "predicates" line as it would if the table was
> not partitioned. IMO predicates should always be included in the nodes where
> they are applied irregardless of partitioning or not to make it clear.
> Query:
> {noformat}
> select * from t1 where part_key=42;
> {noformat}
> From a non-partitioned table:
> {noformat}
> 00:SCAN HDFS [default.t1]
> partitions=1/1 files=2 size=10B
> predicates: default.t1.part_key = 42
> {noformat}
> From a partitioned table:
> {noformat}
> 00:SCAN HDFS [default.t1]
> partitions=1/2 files=1 size=2B
> {noformat}
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