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https://issues.apache.org/jira/browse/SPARK-19595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Burak Yavuz resolved SPARK-19595.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.2.0
Resolved by https://github.com/apache/spark/pull/16929
> 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
> Assignee: Hyukjin Kwon
> Priority: Minor
> Fix For: 2.2.0
>
>
> 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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