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https://issues.apache.org/jira/browse/DRILL-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15818118#comment-15818118
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Serhii Harnyk commented on DRILL-3562:
--------------------------------------
Besides the initialization of empty arrays we have the problem with ordering of
columns with arrays.
Query
{code}
select * from example
{code}
for Json
{noformat}
{ "a": [], "c": [], "c1": 1 }
{ "a": [1], "c": [1], "c1": 1 }
{noformat}
returns result
{noformat}
-------------------------------------------------------------------
| c1<BIGINT(OPTIONAL)>| a<BIGINT(REPEATED)> | c<BIGINT(REPEATED)> |
-------------------------------------------------------------------
| 1 | [] | [] |
| 1 | [1] | [1] |
-------------------------------------------------------------------
{noformat}
with wrong columns order.
> 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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