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From "Rahul Challapalli (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-2868) Drill returning incorrect data when we have fields missing in some of the files
Date Fri, 24 Apr 2015 00:27:39 GMT
Rahul Challapalli created DRILL-2868:
----------------------------------------

             Summary: Drill returning incorrect data when we have fields missing in some of
the files
                 Key: DRILL-2868
                 URL: https://issues.apache.org/jira/browse/DRILL-2868
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Relational Operators, Storage - JSON, Storage - Parquet
            Reporter: Rahul Challapalli
            Assignee: Hanifi Gunes
            Priority: Critical


git.commit.id.abbrev=5cd36c5

Data File1 : a.json
{code}
{ "c1" : 1, "m1" : {"m2" : {"m3" : {"c2" : 5} } } }
{ "c1" : 2, "m1" : {"m2" : {"m3" : {"c2" : 6} } } }
{ "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
{code}

Data File2 : b.json
{code}
{ "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
{ "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
{ "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
{code}

Data File3 : c.json
{code}
{ "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
{ "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
{ "c1" : 3, "m1" : {"m2" : {"c2" : 5} } }
{code}

The below query reports incorrect data :
{code}
select t.m1.m2.m3 from `delme_repro` as `t`;
+------------+
|   EXPR$0   |
+------------+
| null       |
| null       |
| null       |
| null       |
| null       |
| null       |
| null       |
| null       |
| null       |
+------------+
9 rows selected (0.139 seconds)
{code}

However if I run the same query on the specific file, I get the correct output
{code}
select t.m1.m2.m3 from `delme_repro/a.json` as `t`;
+------------+
|   EXPR$0   |
+------------+
| {"c2":5}   |
| {"c2":6}   |
| {}         |
+------------+
3 rows selected (0.113 seconds)
{code}

It looks like the file size plays a part in deciding the order in which Drill reads the files.
But there could be more to this than just the order because when I made sure that 'b.json'
and 'c.json' only had one records, drill correctly reported the data.

Let me know if you have any questions



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