Github user MaxGekk commented on a diff in the pull request:
https://github.com/apache/spark/pull/22237#discussion_r218585584
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/JsonExpressionsSuite.scala
---
@@ -450,7 +450,7 @@ class JsonExpressionsSuite extends SparkFunSuite with
ExpressionEvalHelper with
test("from_json - input=array, schema=struct, output=null") {
val input = """[{"a": 1}, {"a": 2}]"""
val schema = StructType(StructField("a", IntegerType) :: Nil)
- val output = null
+ val output = InternalRow(1)
checkEvaluation(JsonToStructs(schema, Map.empty, Literal(input),
gmtId), output)
--- End diff --
I updated the migration guide and test's title
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