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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2017/02/14 15:35:41 UTC
[jira] [Updated] (SPARK-19595) from_json produces only a single row
when input is a json array
[ https://issues.apache.org/jira/browse/SPARK-19595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon updated SPARK-19595:
---------------------------------
Description:
Currently, {{from_json}} reads a single row when it is a json array. For example,
{code}
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]|
+--------------------+
{code}
Maybe we should not support this in that function or it should work like a generator expression.
was:
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.
> 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,
> {code}
> 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]|
> +--------------------+
> {code}
> Maybe we should not support this in that function or it should work like a generator expression.
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