egor-ryashin opened a new issue, #16315:
URL: https://github.com/apache/druid/issues/16315
MSQ exporting fails to output headers with column types (array/json)
### Affected Version
29.0.0
### Description
This query produces a file with incorrect headers and complex object aren't
properly converted to strings:
```
INSERT INTO
EXTERN(
local(exportPath => '/tmp/test_export11')
)
AS csv
SELECT
1 m1, 'a' d1, array[1,2] array1, json_object('a':1) json1
```
CSV contents:
```
v0,v1,v2,v3
1,a,[Ljava.lang.Number;@9553825,StructuredData{value={a=1}}
```
Expected something like:
```
m1,d1,array1,json1
1,a,"[1,2]","{""a"":1}"
```
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