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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