ravipesala commented on a change in pull request #3129: [CARBONDATA-3295] Fix
that MV datamap throw exception because its rewrite algorithm when query SQL
has multiply subquery
URL: https://github.com/apache/carbondata/pull/3129#discussion_r282845145
##########
File path:
datamap/mv/core/src/main/scala/org/apache/carbondata/mv/datamap/MVHelper.scala
##########
@@ -596,12 +596,20 @@ object MVHelper {
case g: GroupBy =>
MVHelper.updateDataMap(g, rewrite)
}
- // TODO Find a better way to set the rewritten flag, it may fail in some
conditions.
- val mapping =
- rewrittenPlan.collect { case m: ModularPlan => m } zip
- updatedDataMapTablePlan.collect { case m: ModularPlan => m }
- mapping.foreach(f => if (f._1.rewritten) f._2.setRewritten())
+ // Use coarse equal to set the rewritten flag
+ // We may change the ModularPlan relation
+ // So we match the node excluding child comparison
+ updatedDataMapTablePlan.map(plan => {
+ if (rewrittenPlan.find (
+ oriPlan => oriPlan.rewritten && (plan match {
+ case select: Select => select.coarseEqual(oriPlan)
Review comment:
The above can copy the rewritten flag during transformation itself so need
to do equals check.
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