Hyukjin Kwon created SPARK-19595:
------------------------------------
Summary: from_json produces only a single row when input is a json
array
Key: SPARK-19595
URL: https://issues.apache.org/jira/browse/SPARK-19595
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.2.0
Reporter: Hyukjin Kwon
Priority: Minor
Currently, {{from_json}} reads a single row when it is a json array. For
example,
```scala
import org.apache.spark.sql.functions._
import org.apache.spark.sql.types._
val schema = StructType(StructField("a", IntegerType) :: Nil)
Seq(("""[{"a": 1}, {"a":
2}]""")).toDF("struct").select(from_json(col("struct"), schema)).show()
+--------------------+
|jsontostruct(struct)|
+--------------------+
| [1]|
+--------------------+
```
Maybe we should not support this in that function or it should work like a
generator expression.
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