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From "Jinfeng Ni (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3297) Using rank, dense_rank, percent_rank, cume_dist, row_number window functions without OVER clause results in cryptic schema change error
Date Mon, 15 Jun 2015 21:42:01 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14586764#comment-14586764
] 

Jinfeng Ni commented on DRILL-3297:
-----------------------------------

Window functions rank(), dense_ranK() etc must have OVER clause() associated with.  This is
different from aggregate function such as SUM / AVG etc, which will simply become regular
aggregate function, if no OVER clause() is associated.

Therefore, this query is not valid.  Postgres also returned error :

{code}
mydb=# select rank() from emp;
ERROR:  window function call requires an OVER clause
LINE 1: select rank() from emp;
{code}

With that said, I agree we should modify planner to block such query.  Currently, the planer
just treat rank() as regular aggregate function, which leads to execution error, just as reported
in this JIRA. 

  

> Using rank, dense_rank, percent_rank, cume_dist, row_number window functions without
OVER clause results in cryptic schema change error
> ---------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-3297
>                 URL: https://issues.apache.org/jira/browse/DRILL-3297
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>            Reporter: Victoria Markman
>            Assignee: Jinfeng Ni
>
> {code}
> 0: jdbc:drill:schema=dfs> select rank() from t1;
> java.lang.RuntimeException: java.sql.SQLException: SYSTEM ERROR: org.apache.drill.exec.exception.SchemaChangeException:
Failure while materializing expression. 
> Error in expression at index -1.  Error: Missing function implementation: [rank(BIGINT-REQUIRED)].
 Full expression: --UNKNOWN EXPRESSION--.
> Fragment 0:0
> {code}



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