GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/14279
[SPARK-16216][SQL] Write Timestamp and Date in ISO 8601 formatted string by
default for CSV and JSON
## What changes were proposed in this pull request?
Currently, CSV datasource is writing `Timestamp` and `Date` as numeric form
and JSON datasource is writing both as below:
- CSV
```
// TimestampType
1414459800000000
// DateType
16673
```
- Json
```
// TimestampType
1970-01-01 11:46:40.0
// DateType
1970-01-01
```
So, for CSV we can't read back what we write and for JSON it becomes
ambiguous because the timezone is being missed.
So, this PR make both **write** `Timestamp` and `Date` in ISO 8601
formatted string (please refer the [ISO 8601
specification](https://www.w3.org/TR/NOTE-datetime)).
- For `Timestamp` it becomes as below: (`yyyy-MM-dd'T'HH:mm:ss.SZZ`)
```
1970-01-01T02:00:01.000-01:00
```
- For `Date` it becomes as below (`yyyy-MM-dd`)
```
1970-01-01
```
FYI, CSV and JSON users `DateTimeUtils.stringToTime(...)` to read data and
infer schema. This is already okay with ISO 8601 dates. So, this PR only deals
with writing.
## How was this patch tested?
Unit tests were added in `CSVSuite`. For JSON, existing tests cover them.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-16216-json-csv
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14279.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 #14279
----
commit 27de16da5b186a8b7afe911582f738896a285a37
Author: hyukjinkwon <[email protected]>
Date: 2016-07-20T06:42:51Z
Write Timestamp and Date in ISO8601 format by defalt
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