Maxim Gekk created SPARK-24445:
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Summary: Schema in json format for from_json in SQL
Key: SPARK-24445
URL: https://issues.apache.org/jira/browse/SPARK-24445
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.0
Reporter: Maxim Gekk
In Spark 2.3, schema for the from_json function can be specified in JSON format
in Scala and Python but in SQL. In SQL it is impossible to specify map type for
example because SQL DDL parser can handle struct type only. Need to support
schemas in JSON format as it has been already implemented
[there|https://github.com/apache/spark/blob/branch-2.3/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L3225-L3229]:
{code:scala}
val dataType = try {
DataType.fromJson(schema)
} catch {
case NonFatal(_) => StructType.fromDDL(schema)
}
{code}
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