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https://issues.apache.org/jira/browse/DRILL-4693?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15374067#comment-15374067
]
Chun Chang commented on DRILL-4693:
-----------------------------------
verified.
{noformat}
0: jdbc:drill:schema=dfs.drillTestDir> select 'abc' as col1, convert_from('{"x"
: "y"}', 'json') as col2, 'xyz' as col3 from cp.`tpch/region.parquet`;
+-------+------------+-------+
| col1 | col2 | col3 |
+-------+------------+-------+
| abc | {"x":"y"} | xyz |
| abc | {"x":"y"} | xyz |
| abc | {"x":"y"} | xyz |
| abc | {"x":"y"} | xyz |
| abc | {"x":"y"} | xyz |
+-------+------------+-------+
5 rows selected (0.938 seconds)
0: jdbc:drill:schema=dfs.drillTestDir> select * from sys.version;
+-----------------+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------+----------------------------+---------------------+----------------------------+
| version | commit_id |
commit_message
| commit_time | build_email |
build_time |
+-----------------+-------------------------------------------+-----------------------------------------------------------------------------------------------------------------+----------------------------+---------------------+----------------------------+
| 1.8.0-SNAPSHOT | 05c42eae79ce3e309028b3824f9449b98e329f29 | DRILL-4707: Fix
memory leak or incorrect query result in case two column names are
case-insensitive identical. | 29.06.2016 @ 08:15:13 PDT | [email protected]
| 07.07.2016 @ 10:51:08 PDT |
{noformat}
> 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
> Assignee: Aman Sinha
> Fix For: 1.7.0
>
>
> 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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