Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/3213#discussion_r20406534
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/SchemaRDD.scala ---
@@ -131,6 +134,69 @@ class SchemaRDD(
*/
lazy val schema: StructType = queryExecution.analyzed.schema
+ /** Transforms a single Row to JSON using Jackson
+ *
+ * @param jsonFactory a JsonFactory object to construct a JsonGenerator
+ * @param rowSchema the schema object used for conversion
+ * @param row The row to convert
+ */
+ private def rowToJSON(rowSchema: StructType, jsonFactory:
JsonFactory)(row: Row): String = {
+ val writer = new StringWriter()
+ val gen = jsonFactory.createGenerator(writer)
+
+ def valWriter: (DataType, Any) => Unit = {
+ case(_, null) => //do nothing
+ case(StringType, v: String) => gen.writeString(v)
+ case(TimestampType, v: java.sql.Timestamp) =>
gen.writeString(v.toString)
+ case(IntegerType, v: Int) => gen.writeNumber(v)
+ case(ShortType, v: Short) => gen.writeNumber(v)
+ case(FloatType, v: Float) => gen.writeNumber(v)
+ case(DoubleType, v: Double) => gen.writeNumber(v)
+ case(LongType, v: Long) => gen.writeNumber(v)
+ case(DecimalType(), v: java.math.BigDecimal) => gen.writeNumber(v)
+ case(ByteType, v: Byte) => gen.writeNumber(v.toInt)
+ case(BinaryType, v: Array[Byte]) => gen.writeBinary(v)
+ case(BooleanType, v: Boolean) => gen.writeBoolean(v)
+
+ case(ArrayType(ty, _), v: Seq[_] ) =>
+ gen.writeStartArray()
+ v.foreach(valWriter(ty,_))
--- End diff --
I think we need to keep `null`s in an array. Otherwise, the information
carried by the array will be changed.
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