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https://issues.apache.org/jira/browse/DRILL-2872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14512011#comment-14512011
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Parth Chandra commented on DRILL-2872:
--------------------------------------
This is an issue with converting from a repeated type to JSON.
select interests from dfs.`complex_student.json`
+------------+
| interests |
+------------+
| ["Reading","Mountain Biking","Hacking"] |
| ["Soccer","Mountain Biking","C#"] |
| ["Tennis","Mountain Biking","Painting"] |
| ["Hockey","Mountain Biking","Singing"] |
| ["Swimming","Mountain Biking","Sking"] |
| ["Badminton","Hiking","Hacking"] |
| ["Cricket","Mountain Biking","Cooking"] |
| ["Table Tennis","Running","Hacking"] |
| ["Surfing","Mountain Biking","Music"] |
| ["Fencing","Mountain Biking","Writing"] |
+------------+
The following query returns nulls.
select cast(convert_to(interests, 'JSON') as varchar(0)) from
dfs.`complex_student.json`
+------------+
| EXPR$0 |
+------------+
| [ null, null, null ] |
| [ null, null, null ] |
| [ null, null, null ] |
| [ null, null, null ] |
| [ null, null, null ] |
| [ null, null, null ] |
| [ null, null, null ] |
| [ null, null, null ] |
| [ null, null, null ] |
| [ null, null, null ] |
+------------+
> Result from json file returns data from map type fields as "null"
> -----------------------------------------------------------------
>
> Key: DRILL-2872
> URL: https://issues.apache.org/jira/browse/DRILL-2872
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Data Types
> Reporter: Krystal
> Assignee: Parth Chandra
> Priority: Critical
> Fix For: 1.0.0
>
> Attachments: complex_student.json
>
>
> git.commit.id=9ec257efb7992209e27c82e6f4ee8a5b12cc95e4
> select from a json file from ODBC returns data for map fields as "null". For
> example:
> select * from `dfs.drillTestDirJson`.`complex_student.json`
> 1 fred ovid 76 1.55 692315658449 2014-05-27 00:26:07 [ null, null, null ]
> { "color" : "Blue", "sport" : "Soccer", "food" : "Spaghetti" }
> 2 bob brown 63 3.18 650706039334 2014-12-04 21:43:14 [ null, null, null ]
> { "color" : "Green", "sport" : "Soccer", "food" : "Pizza" }
> 3 bob hernandez 28 1.09 293612255322 2014-05-31 14:33:06 [ null, null, null ]
> { "color" : "Red", "sport" : "Tennis", "food" : "Hamburger" }
> 4 ulysses xylophone 31 1.67 896547822355 2014-06-12 11:27:33 [ null, null,
> null ]
> { "color" : "Yellow", "sport" : "Hockey", "food" : "Pizza" }
> sqlline returns correct data for the same query.
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