[jira] [Commented] (FLINK-25593) A redundant scan could be skipped if it is an input of join and the other input is empty after partition prune
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https://issues.apache.org/jira/browse/FLINK-25593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17764951#comment-17764951
]
Yunhong Zheng commented on FLINK-25593:
---
Hi, [~jark] . I think the better final plan of this case should be empty values.
> A redundant scan could be skipped if it is an input of join and the other
> input is empty after partition prune
> --
>
> Key: FLINK-25593
> URL: https://issues.apache.org/jira/browse/FLINK-25593
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
>Reporter: Jing Zhang
>Assignee: luoyuxia
>Priority: Major
>
> A redundant scan could be skipped if it is an input of join and the other
> input is empty after partition prune.
> For example:
> ltable has two partitions: pt=0 ad pt=1, rtable has one partition pt1=0.
> The schema of ltable is (lkey string, value int).
> The schema of rtable is (rkey string, value int).
> {code:sql}
> SELECT * FROM ltable, rtable WHERE pt=2 and pt1=0 and `lkey`=rkey
> {code}
> The plan is as following.
> {code:java}
> Calc(select=[lkey, value, CAST(2 AS INTEGER) AS pt, rkey, value1, CAST(0 AS
> INTEGER) AS pt1])
> +- HashJoin(joinType=[InnerJoin], where=[=(lkey, rkey)], select=[lkey, value,
> rkey, value1], build=[right])
>:- Exchange(distribution=[hash[lkey]])
>: +- TableSourceScan(table=[[hive, source_db, ltable, partitions=[],
> project=[lkey, value]]], fields=[lkey, value])
>+- Exchange(distribution=[hash[rkey]])
> +- TableSourceScan(table=[[hive, source_db, rtable,
> partitions=[{pt1=0}], project=[rkey, value1]]], fields=[rkey, value1])
> {code}
> There is no need to scan right side because the left input of join has 0
> partitions after partition prune.
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[jira] [Commented] (FLINK-25593) A redundant scan could be skipped if it is an input of join and the other input is empty after partition prune
[
https://issues.apache.org/jira/browse/FLINK-25593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17764949#comment-17764949
]
Yunhong Zheng commented on FLINK-25593:
---
Hi, [~luoyuxia] .Is this still in progress? If not, could you assign to me!
Thanks!
> A redundant scan could be skipped if it is an input of join and the other
> input is empty after partition prune
> --
>
> Key: FLINK-25593
> URL: https://issues.apache.org/jira/browse/FLINK-25593
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
>Reporter: Jing Zhang
>Assignee: luoyuxia
>Priority: Major
>
> A redundant scan could be skipped if it is an input of join and the other
> input is empty after partition prune.
> For example:
> ltable has two partitions: pt=0 ad pt=1, rtable has one partition pt1=0.
> The schema of ltable is (lkey string, value int).
> The schema of rtable is (rkey string, value int).
> {code:sql}
> SELECT * FROM ltable, rtable WHERE pt=2 and pt1=0 and `lkey`=rkey
> {code}
> The plan is as following.
> {code:java}
> Calc(select=[lkey, value, CAST(2 AS INTEGER) AS pt, rkey, value1, CAST(0 AS
> INTEGER) AS pt1])
> +- HashJoin(joinType=[InnerJoin], where=[=(lkey, rkey)], select=[lkey, value,
> rkey, value1], build=[right])
>:- Exchange(distribution=[hash[lkey]])
>: +- TableSourceScan(table=[[hive, source_db, ltable, partitions=[],
> project=[lkey, value]]], fields=[lkey, value])
>+- Exchange(distribution=[hash[rkey]])
> +- TableSourceScan(table=[[hive, source_db, rtable,
> partitions=[{pt1=0}], project=[rkey, value1]]], fields=[rkey, value1])
> {code}
> There is no need to scan right side because the left input of join has 0
> partitions after partition prune.
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[jira] [Commented] (FLINK-25593) A redundant scan could be skipped if it is an input of join and the other input is empty after partition prune
[
https://issues.apache.org/jira/browse/FLINK-25593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=17513283#comment-17513283
]
Jark Wu commented on FLINK-25593:
-
If the left scan is prunned, then the inner join can also be pruned, the final
plan should be an empty values?
> A redundant scan could be skipped if it is an input of join and the other
> input is empty after partition prune
> --
>
> Key: FLINK-25593
> URL: https://issues.apache.org/jira/browse/FLINK-25593
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
>Reporter: Jing Zhang
>Priority: Major
>
> A redundant scan could be skipped if it is an input of join and the other
> input is empty after partition prune.
> For example:
> ltable has two partitions: pt=0 ad pt=1, rtable has one partition pt1=0.
> The schema of ltable is (lkey string, value int).
> The schema of rtable is (rkey string, value int).
> {code:sql}
> SELECT * FROM ltable, rtable WHERE pt=2 and pt1=0 and `lkey`=rkey
> {code}
> The plan is as following.
> {code:java}
> Calc(select=[lkey, value, CAST(2 AS INTEGER) AS pt, rkey, value1, CAST(0 AS
> INTEGER) AS pt1])
> +- HashJoin(joinType=[InnerJoin], where=[=(lkey, rkey)], select=[lkey, value,
> rkey, value1], build=[right])
>:- Exchange(distribution=[hash[lkey]])
>: +- TableSourceScan(table=[[hive, source_db, ltable, partitions=[],
> project=[lkey, value]]], fields=[lkey, value])
>+- Exchange(distribution=[hash[rkey]])
> +- TableSourceScan(table=[[hive, source_db, rtable,
> partitions=[{pt1=0}], project=[rkey, value1]]], fields=[rkey, value1])
> {code}
> There is no need to scan right side because the left input of join has 0
> partitions after partition prune.
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