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Posted to issues@drill.apache.org by "Rahul Challapalli (JIRA)" <ji...@apache.org> on 2014/11/07 03:03:33 UTC
[jira] [Created] (DRILL-1653) flatten function over kvgen gives
wrong output when kvgen returns an empty map
Rahul Challapalli created DRILL-1653:
----------------------------------------
Summary: flatten function over kvgen gives wrong output when kvgen returns an empty map
Key: DRILL-1653
URL: https://issues.apache.org/jira/browse/DRILL-1653
Project: Apache Drill
Issue Type: Bug
Components: Functions - Drill, Storage - JSON
Reporter: Rahul Challapalli
git.commit.id.abbrev=60aa446
I ran the below test against the private branch of Jason which has some patches for bugs related to flatten which are not yet merged into the master.
Dataset used:
{code}
{
"id": 1,
"m": {"a":1,"b":2}
}
{
"id": 2
}
{
"id": 3,
"m": {"c":3,"d":4}
}
{code}
kvgen works as expected
{code}
select id, kvgen(m) from `json_kvgenflatten/missing-map.json`;
+------------+------------+
| id | EXPR$1 |
+------------+------------+
| 1 | [{"key":"a","value":1},{"key":"b","value":2}] |
| 2 | [] |
| 3 | [{"key":"c","value":3},{"key":"d","value":4}] |
{code}
Applying a flatten on top of kvgen returns wrong results
{code}
select id, flatten(kvgen(m)) from `json_kvgenflatten/missing-map.json`;
+------------+------------+
| id | EXPR$1 |
+------------+------------+
| 1 | {"key":"\u0001","value":3} |
| 1 | {"key":"\u0001","value":4} |
| 3 | {} |
| 3 | {} |
+------------+------------+
{code}
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