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
##########
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 this scenario needs to be
handled in generalized way i think
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