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From "Joanlynn LIN (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-3370) FLATTEN error with a where clause
Date Thu, 25 Jun 2015 06:22:05 GMT
Joanlynn LIN created DRILL-3370:
-----------------------------------

             Summary: FLATTEN error with a where clause
                 Key: DRILL-3370
                 URL: https://issues.apache.org/jira/browse/DRILL-3370
             Project: Apache Drill
          Issue Type: Bug
          Components: SQL Parser
    Affects Versions: 1.0.0
            Reporter: Joanlynn LIN
            Assignee: Aman Sinha


I've got a JSON file which contains 150 JSON strings all like this:
{"arr": [94]}
{"arr": [39]}
{"arr": [180]}

I was trying to Flatten() the arrays and filter the values using such an SQL query:
    select flatten(arr) as a from dfs.`/data/test/jsonarray.150.json` where a > 100;
However, it returned no result. Then I modified my expression like this:
	select a from (select flatten(arr) as a from dfs.`/data/test/jsonarray.150.json`) where a
> 100;
It then failed:
    Error: SYSTEM ERROR: org.apache.drill.exec.exception.SchemaChangeException: Failure while
trying to materialize incoming schema.  Errors:
    Error in expression at index -1.  Error: Missing function implementation: [flatten(BIGINT-REPEATED)].
 Full expression: --UNKNOWN EXPRESSION--..
    Fragment 0:0
    [Error Id: 1d71bf0e-48da-43f8-8b36-6a513120d7e0 on slave2:31010] (state=,code=0)
After a lot of attempts, I finally got it work:
    select a from (select flatten(arr) as a from dfs.`/data/test/jsonarray.150.json` limit
10000000) where a > 100;
See, I just added a "limit 10000000" in this query and I am wondering if this is a bug or
what in Drill?
Looking forward to your attention and help. Many thanks.



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