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Posted to issues@spark.apache.org by "Yuming Wang (JIRA)" <ji...@apache.org> on 2017/11/12 16:27:00 UTC
[jira] [Updated] (SPARK-22497) Reuse project
[ https://issues.apache.org/jira/browse/SPARK-22497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Yuming Wang updated SPARK-22497:
--------------------------------
Description:
The below SQL will scan {{table1}} twice. We can reuse the first Project.
{code:sql}
with p1 as (select * from table1 where key < 100),
s1 as (SELECT key, count(*) FROM p1 group by key),
s2 as (SELECT key, count(*) FROM p1 where key > -100 group by key)
select s1.* from s1 join s2 on s1.key= s2.key
{code}
was:
The below SQL will scan {{table1}} twice. It can reuse the first Project.
{code:sql}
with p1 as (select * from table1 where key < 100),
s1 as (SELECT key, count(*) FROM p1 group by key),
s2 as (SELECT key, count(*) FROM p1 where key > -100 group by key)
select s1.* from s1 join s2 on s1.key= s2.key
{code}
> Reuse project
> -------------
>
> Key: SPARK-22497
> URL: https://issues.apache.org/jira/browse/SPARK-22497
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Yuming Wang
>
> The below SQL will scan {{table1}} twice. We can reuse the first Project.
> {code:sql}
> with p1 as (select * from table1 where key < 100),
> s1 as (SELECT key, count(*) FROM p1 group by key),
> s2 as (SELECT key, count(*) FROM p1 where key > -100 group by key)
> select s1.* from s1 join s2 on s1.key= s2.key
> {code}
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