Github user jackylk commented on a diff in the pull request:
https://github.com/apache/incubator-carbondata/pull/666#discussion_r106629326
--- Diff: integration/spark2/src/main/scala/org/apache/spark/sql/CarbonDictionaryDecoder.scala ---
@@ -371,6 +307,79 @@ case class CarbonDictionaryDecoder(
}
+object CarbonDictionaryDecoder {
+
+ def convertOutput(output: Seq[Attribute],
+ relations: Seq[CarbonDecoderRelation],
+ profile: CarbonProfile,
+ aliasMap: CarbonAliasDecoderRelation): Seq[Attribute] = {
+ output.map { a =>
+ val attr = aliasMap.getOrElse(a, a)
+ val relation = relations.find(p => p.contains(attr))
+ if (relation.isDefined && canBeDecoded(attr, profile)) {
+ val carbonTable = relation.get.carbonRelation.carbonRelation.metaData.carbonTable
+ val carbonDimension = carbonTable
+ .getDimensionByName(carbonTable.getFactTableName, attr.name)
+ if (carbonDimension != null &&
+ carbonDimension.hasEncoding(Encoding.DICTIONARY) &&
+ !carbonDimension.hasEncoding(Encoding.DIRECT_DICTIONARY) &&
+ !carbonDimension.isComplex()) {
+ val newAttr = AttributeReference(a.name,
+ convertCarbonToSparkDataType(carbonDimension,
+ relation.get.carbonRelation.carbonRelation),
+ a.nullable,
+ a.metadata)(a.exprId).asInstanceOf[Attribute]
+ newAttr
+ } else {
+ a
+ }
+ } else {
+ a
+ }
+ }
+ }
+
+ def canBeDecoded(attr: Attribute, profile: CarbonProfile): Boolean = {
--- End diff --
please give some description comment for this function
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