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https://issues.apache.org/jira/browse/HIVE-17193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16214737#comment-16214737
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Rui Li edited comment on HIVE-17193 at 10/23/17 6:57 AM:
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Hi [~kellyzly],
bq. how to compare the result of dpp work in the period of physical plan?
We can compare the DPP works the same way as we compare other works, i.e. if
two works have the same operator tree and each operator has an equivalent
counterpart, then the two works can be combined.
was (Author: lirui):
Hi [~kellyzly],
bq. how to compare the result of dpp work in the period of physical plan?
We can compare the DPP works the same way as we compare other works, i.e. if
two works have the same operator tree and all the each operator has an
equivalent counterpart, then the two works can be combined.
> HoS: don't combine map works that are targets of different DPPs
> ---------------------------------------------------------------
>
> Key: HIVE-17193
> URL: https://issues.apache.org/jira/browse/HIVE-17193
> Project: Hive
> Issue Type: Bug
> Reporter: Rui Li
> Assignee: Rui Li
>
> Suppose {{srcpart}} is partitioned by {{ds}}. The following query can trigger
> the issue:
> {code}
> explain
> select * from
> (select srcpart.ds,srcpart.key from srcpart join src on srcpart.ds=src.key)
> a
> join
> (select srcpart.ds,srcpart.key from srcpart join src on
> srcpart.ds=src.value) b
> on a.key=b.key;
> {code}
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