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[SPARK-21804][SQL] json_tuple returns null values within repeated columns except the first one #19017

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jmchung wants to merge 4 commits into from
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[SPARK-21804][SQL] json_tuple returns null values within repeated columns except the first one #19017

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f04b896
SPARK-21804: json_tuple returns null values within repeated columns e…
jmchung Aug 22, 2017
8a25e92
change functional transformations to while loop
jmchung Aug 23, 2017
ff01e04
change to meaningful name to variable
jmchung Aug 24, 2017
792f350
simplify the codes
jmchung Aug 24, 2017
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7 changes: 4 additions & 3 deletions sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -433,11 +433,12 @@ case class JsonTuple(children: Seq[Expression])
val row = Array.ofDim[Any](fieldNames.length)

// start reading through the token stream, looking for any requested field names
val fieldNamesWithIndex = fieldNames.zipWithIndex
while (parser.nextToken() != JsonToken.END_OBJECT) {
if (parser.getCurrentToken == JsonToken.FIELD_NAME) {
// check to see if this field is desired in the output
val idx = fieldNames.indexOf(parser.getCurrentName)
if (idx >= 0) {
val indices = fieldNamesWithIndex.filter(_._1 == parser.getCurrentName).map(_._2)
if (indices.nonEmpty) {
// it is, copy the child tree to the correct location in the output row
val output = new ByteArrayOutputStream()

Expand All @@ -447,7 +448,7 @@ case class JsonTuple(children: Seq[Expression])
generator => copyCurrentStructure(generator, parser)
}

row(idx) = UTF8String.fromBytes(output.toByteArray)
indices.foreach(idx => row(idx) = UTF8String.fromBytes(output.toByteArray))
}
}
}
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10 changes: 10 additions & 0 deletions ...alyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/JsonExpressionsSuite.scala
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Expand Up @@ -373,6 +373,16 @@ class JsonExpressionsSuite extends SparkFunSuite with ExpressionEvalHelper {
InternalRow(UTF8String.fromString("1"), null, UTF8String.fromString("2")))
}

test("SPARK-21804: json_tuple returns null values within repeated columns except the first one") {
checkJsonTuple(
JsonTuple(Literal("""{"f1": 1, "f2": 2}""") ::
NonFoldableLiteral("f1") ::
NonFoldableLiteral("cast(NULL AS STRING)") ::
NonFoldableLiteral("f1") ::
Nil),
InternalRow(UTF8String.fromString("1"), null, UTF8String.fromString("1")))
}

val gmtId = Option(DateTimeUtils.TimeZoneGMT.getID)

test("from_json") {
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