[GitHub] [carbondata] akashrn5 commented on a change in pull request #3312: [CARBONDATA-3457][MV] Fix Column not found issue with Query having Cast Expression

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akashrn5 commented on a change in pull request #3312: [CARBONDATA-3457][MV] Fix Column not found issue with Query having Cast Expression
URL: https://github.com/apache/carbondata/pull/3312#discussion_r299327834
 
 

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 File path: datamap/mv/core/src/main/scala/org/apache/carbondata/mv/rewrite/DefaultMatchMaker.scala
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 @@ -53,6 +53,13 @@ abstract class DefaultMatchPattern extends MatchPattern[ModularPlan] {
             (a.child.asInstanceOf[Attribute], a.toAttribute)
           })
 
+    // Create aliasMap with Cast Expression to alias reference attribute
+    val aliasMapCast =
+      subsumer.outputList.collect {
+        case a: Alias if a.child.isInstanceOf[Cast] =>
 
 Review comment:
   i think, you cannot just restrict it to cast, because cast is in this case, for example, if i just have query as 
   `select floor(m_month) as a, c_code as abc from maintable` (query derived from your test case) , then this also fails. Because here you will have project as `[FLOOR(cast(age#7 as double)) AS a#44L]`. So again this scenario needs to be handled in generalized way i  think

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