Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/20700#discussion_r171774581
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -734,23 +734,26 @@ case class Cast(child: Expression, dataType:
DataType, timeZoneId: Option[String
val keyToStringFunc = dataToStringFunc("keyToString", kt)
val valueToStringFunc = dataToStringFunc("valueToString", vt)
val loopIndex = ctx.freshName("loopIndex")
+ val getValueMapKeyArray0 = CodeGenerator.getValue(s"$map.keyArray()",
kt, "0")
+ val getValueMapValArray0 =
CodeGenerator.getValue(s"$map.valueArray()", vt, "0")
+ val getValueMapKeyArray = CodeGenerator.getValue(s"$map.keyArray()",
kt, loopIndex)
+ val getValueMapValArray = CodeGenerator.getValue(s"$map.valueArray()",
vt, loopIndex)
--- End diff --
`getMapKeyArray` and `getMapValueArray`
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