[jira] [Commented] (DRILL-3562) Query fails when using flatten on JSON data where some documents have an empty array

["Serhii Harnyk (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15763911#comment-15763911 ] 

Serhii Harnyk commented on DRILL-3562:
--------------------------------------

This issue is still reproducing on the Json file:
{noformat}
{ "a": { "b": { "c": [] } } }
{noformat}
with query:
{code}
select FLATTEN(t.a.b.c) AS c from dfs.`/home/files/flat.json` t;
{code}

> Query fails when using flatten on JSON data where some documents have an empty array
> ------------------------------------------------------------------------------------
>
>                 Key: DRILL-3562
>                 URL: https://issues.apache.org/jira/browse/DRILL-3562
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Storage - JSON
>    Affects Versions: 1.1.0
>            Reporter: Philip Deegan
>            Assignee: Serhii Harnyk
>             Fix For: Future
>
>
> Drill query fails when using flatten when some records contain an empty array 
> {noformat}
> SELECT COUNT(*) FROM (SELECT FLATTEN(t.a.b.c) AS c FROM dfs.`flat.json` t) flat WHERE flat.c.d.e = 'f' limit 1;
> {noformat}
> Succeeds on 
> { "a": { "b": { "c": [  { "d": {  "e": "f" } } ] } } }
> Fails on
> { "a": { "b": { "c": [] } } }
> Error
> {noformat}
> Error: SYSTEM ERROR: ClassCastException: Cannot cast org.apache.drill.exec.vector.NullableIntVector to org.apache.drill.exec.vector.complex.RepeatedValueVector
> {noformat}
> Is it possible to ignore the empty arrays, or do they need to be populated with dummy data?



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