GitHub user MaxGekk opened a pull request:
https://github.com/apache/spark/pull/22226
[SPARK-24391][SQL] Support arrays of any types by to_json
## What changes were proposed in this pull request?
In the PR, I propose to extended `to_json` and support any types as element
types of input arrays. It should allow converting arrays of primitive types and
arrays of arrays. For example:
```
select to_json(array('1','2','3'))
> ["1","2","3"]
select to_json(array(array(1,2,3),array(4)))
> [[1,2,3],[4]]
```
## How was this patch tested?
Added a couple sql tests for arrays of primitive type and of arrays. Also I
added round trip test `from_json` -> `to_json`.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/MaxGekk/spark-1 to_json-array
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22226.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #22226
----
commit fb727268b776f3c9b896abfee60e8538aa9e93e4
Author: Maxim Gekk <maxim.gekk@...>
Date: 2018-08-24T18:57:36Z
Support arrays of any types in to_json
commit e9a5f50720d0e6ab301afaa3a4eff801de1240d7
Author: Maxim Gekk <maxim.gekk@...>
Date: 2018-08-24T19:18:19Z
sql tests for array of primitive type and of arrays
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