Github user kiszk commented on a diff in the pull request:
https://github.com/apache/spark/pull/19730#discussion_r151509423
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -1039,13 +1039,19 @@ case class Cast(child: Expression, dataType:
DataType, timeZoneId: Option[String
}
}
"""
- }.mkString("\n")
+ }
+ val fieldsEvalCodes = if (ctx.INPUT_ROW != null && ctx.currentVars ==
null) {
+ ctx.splitExpressions(fieldsEvalCode, "castStruct",
+ ("InternalRow", ctx.INPUT_ROW) :: (rowClass, result) ::
("InternalRow", tmpRow) :: Nil)
--- End diff --
Inner struct case in the following code works well.
```
val struct = Literal.create(
Row(
UTF8String.fromString("123.4"),
Seq("456", "true", "78.9"),
Row(7)),
StructType(Seq(
StructField("i", StringType, nullable = true),
StructField("a",
ArrayType(StringType, containsNull = false), nullable = true),
StructField("s",
StructType(Seq(
StructField("i", IntegerType, nullable = true)))))))
val ret = cast(struct, StructType(Seq(
StructField("d", DoubleType, nullable = true),
StructField("a",
ArrayType(IntegerType, containsNull = true), nullable = true),
StructField("s",
StructType(Seq(
StructField("l", LongType, nullable = true)))))))
assert(ret.resolved === true)
checkEvaluation(ret, Row(123.4, Seq(456, null, 78), Row(7L)))
```
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