[jira] [Created] (DRILL-4693) Incorrect column ordering when CONVERT_FROM() json is used

["Aman Sinha (JIRA)" <ji...@apache.org>]

Aman Sinha created DRILL-4693:
---------------------------------

             Summary: Incorrect column ordering when CONVERT_FROM() json is used 
                 Key: DRILL-4693
                 URL: https://issues.apache.org/jira/browse/DRILL-4693
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Relational Operators, Query Planning & Optimization
    Affects Versions: 1.6.0
            Reporter: Aman Sinha


For the following query, the column order in the results is wrong..it should be col1, col2, col3. 
{noformat}
0: jdbc:drill:zk=local> select 'abc' as col1, convert_from('{"x" : "y"}', 'json') as col2, 'xyz' as col3 from cp.`tpch/region.parquet`;
+-------+-------+------------+
| col1  | col3  |    col2    |
+-------+-------+------------+
| abc   | xyz   | {"x":"y"}  |
| abc   | xyz   | {"x":"y"}  |
| abc   | xyz   | {"x":"y"}  |
| abc   | xyz   | {"x":"y"}  |
| abc   | xyz   | {"x":"y"}  |
+-------+-------+------------+
{noformat}

The EXPLAIN plan:
{noformat}
0: jdbc:drill:zk=local> explain plan for select 'abc' as col1, convert_from('{"x" : "y"}', 'json') as col2, 'xyz' as col3 from cp.`tpch/region.parquet`;
+------+------+
| text | json |
+------+------+
| 00-00    Screen
00-01      Project(col1=['abc'], col2=[CONVERT_FROMJSON('{"x" : "y"}')], col3=['xyz'])
00-02        Scan(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=classpath:/tpch/region.parquet]], selectionRoot=classpath:/tpch/region.parquet, numFiles=1, usedMetadataFile=false, columns=[]]])
{noformat}

This happens on current master branch as well as 1.6.0 and even earlier (I checked 1.4.0 as well which also has the same behavior).  So it is a pre-existing bug.  




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