[jira] [Created] (DRILL-1759) Flatten : When the item to be flattened contains a repeated map, we are loosing some data

[Rahul Challapalli (JIRA)]

Rahul Challapalli created DRILL-1759:
----------------------------------------

             Summary: Flatten : When the item to be flattened contains a 
repeated map, we are loosing some data 
                 Key: DRILL-1759
                 URL: https://issues.apache.org/jira/browse/DRILL-1759
             Project: Apache Drill
          Issue Type: Bug
          Components: Functions - Drill, Storage - JSON, Storage - Parquet
            Reporter: Rahul Challapalli
            Priority: Critical


git.commit.id.abbrev=108d29f

Dataset :
{code}
{ "rm": [ {"map": [{ "a": "foo"}]}]}
{code}

When I try to flatten 'rm' we are losing the contents of 'map'
{code}
select flatten(rm) from `json_kvgenflatten/nested1.json`;
+------------+
|   EXPR$0   |
+------------+
| {"map":[]} |
+------------+
{code}

This behavior can also be replicated on a parquet dataset as well. Let me know 
if you need anything else.




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