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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