qiuchenjian commented on a change in pull request #3058: [CARBONDATA-3238] Solve StackOverflowError using MV datamap
URL:
https://github.com/apache/carbondata/pull/3058#discussion_r248959581
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File path: datamap/mv/core/src/main/scala/org/apache/carbondata/mv/rewrite/DefaultMatchMaker.scala
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@@ -677,8 +677,18 @@ object SelectSelectGroupbyChildDelta extends DefaultMatchPattern with PredicateH
val aliasMap_exp = AttributeMap(
gb_2c.outputList.collect {
case a: Alias => (a.toAttribute, a) })
+
+ // avoid to transform a expression more than twrice
+ // accept for select and having
+ val transformedExpFlags = scala.collection.mutable.Map[ExprId, Int]()
+ aliasMap_exp.keySet.map(alias =>
+ transformedExpFlags += (alias.exprId -> 0))
val sel_3q_exp = sel_3q.transformExpressions({
- case attr: Attribute if aliasMap_exp.contains(attr) => aliasMap_exp(attr)
+ case attr: Attribute if aliasMap_exp.contains(attr) &&
+ transformedExpFlags(attr.exprId) < 2 => {
+ transformedExpFlags(attr.exprId) += 1
+ aliasMap_exp(attr)
+ }
Review comment:
@ravipesala done! thanks for your help
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