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Posted to issues@spark.apache.org by "Yuming Wang (JIRA)" <ji...@apache.org> on 2017/11/12 16:14:01 UTC

[jira] [Created] (SPARK-22497) Reuse project

Yuming Wang created SPARK-22497:
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             Summary: 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. 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}



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