GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/17192
[SPARK-19849][SQL] Support ArrayType in to_json to produce JSON array
## What changes were proposed in this pull request?
This PR proposes to support an array of struct type in `to_json` as below:
```scala
import org.apache.spark.sql.functions._
val df = Seq(Tuple1(Tuple1(1) :: Nil)).toDF("a")
df.select(to_json($"a").as("json")).show()
```
```
+----------+
| json|
+----------+
|[{"_1":1}]|
+----------+
```
Currently, it throws an exception as below (a newline manually inserted for
readability):
```
org.apache.spark.sql.AnalysisException: cannot resolve
'structtojson(`array`)' due to data type
mismatch: structtojson requires that the expression is a struct
expression.;;
```
This allows the roundtrip with `from_json` as below:
```scala
import org.apache.spark.sql.functions._
import org.apache.spark.sql.types._
val schema = ArrayType(StructType(StructField("a", IntegerType) :: Nil))
val df = Seq("""[{"a":1},
{"a":2}]""").toDF("json").select(from_json($"json", schema).as("array"))
df.show()
// Read back.
df.select(to_json($"array").as("json")).show()
```
```
+----------+
| array|
+----------+
|[[1], [2]]|
+----------+
+-----------------+
| json|
+-----------------+
|[{"a":1},{"a":2}]|
+-----------------+
```
Also, this PR proposes to rename from `StructToJson` to
`StructOrArrayToJson ` and `JsonToStruct` to `JsonToStructOrArray`.
## How was this patch tested?
Unit tests in `JsonFunctionsSuite` and `JsonExpressionsSuite` for Scala,
doctest for Python and test in `test_sparkSQL.R` for R.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark SPARK-19849
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/17192.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 #17192
----
commit 92922650ca6bf44ef4f4daf02653f66125e881d2
Author: hyukjinkwon <[email protected]>
Date: 2017-03-07T14:43:37Z
Support ArrayType in to_json to produce JSON array
----
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