Github user brkyvz commented on a diff in the pull request:
https://github.com/apache/spark/pull/17192#discussion_r106566917
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
---
@@ -589,52 +591,69 @@ case class StructToJson(
def this(child: Expression) = this(Map.empty, child, None)
def this(child: Expression, options: Expression) =
this(
- options = StructToJson.convertToMapData(options),
+ options = StructOrArrayToJson.convertToMapData(options),
child = child,
timeZoneId = None)
@transient
lazy val writer = new CharArrayWriter()
@transient
- lazy val gen =
- new JacksonGenerator(
- child.dataType.asInstanceOf[StructType],
- writer,
- new JSONOptions(options, timeZoneId.get))
+ lazy val gen = new JacksonGenerator(
+ rowSchema, writer, new JSONOptions(options, timeZoneId.get))
+
+ @transient
+ lazy val rowSchema = child.dataType match {
+ case st: StructType => st
+ case ArrayType(st: StructType, _) => st
+ }
+
+ // This converts rows to the JSON output according to the given schema.
+ @transient
+ lazy val converter: Any => String = {
+ def getAndReset(): String = {
+ gen.flush()
+ val json = writer.toString
+ writer.reset()
+ json
--- End diff --
nit: why don't you perform `UTF8String.fromString(` here?
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