01dd008301
## What changes were proposed in this pull request? This PR proposes to add `to_json` function in contrast with `from_json` in Scala, Java and Python. It'd be useful if we can convert a same column from/to json. Also, some datasources do not support nested types. If we are forced to save a dataframe into those data sources, we might be able to work around by this function. The usage is as below: ``` scala val df = Seq(Tuple1(Tuple1(1))).toDF("a") df.select(to_json($"a").as("json")).show() ``` ``` bash +--------+ | json| +--------+ |{"_1":1}| +--------+ ``` ## How was this patch tested? Unit tests in `JsonFunctionsSuite` and `JsonExpressionsSuite`. Author: hyukjinkwon <gurwls223@gmail.com> Closes #15354 from HyukjinKwon/SPARK-17764. |
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scala/org/apache/spark/sql |