miklosgergely commented on a change in pull request #866: HIVE-22536 Improve
return path enabling/disabling
URL: https://github.com/apache/hive/pull/866#discussion_r357652794
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File path: ql/src/java/org/apache/hadoop/hive/ql/parse/CalcitePlanner.java
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@@ -464,7 +464,7 @@ Operator genOPTree(ASTNode ast, PlannerContext plannerCtx)
throws SemanticExcept
// 0. Gen Optimized Plan
RelNode newPlan = logicalPlan();
- if (this.conf.getBoolVar(HiveConf.ConfVars.HIVE_CBO_RETPATH_HIVEOP))
{
+ if (ReturnPathManager.shouldUse()) {
if (cboCtx.type == PreCboCtx.Type.VIEW && !materializedView) {
Review comment:
I don't understand this, the line here is to decide if we'd use the "return
path way" or the "non return path way". What are your referring to here as
failing?
My concept was that in case of "supported" we decide between these two by
applying some logic that decides whether the actual command is in the supported
set of commands that are already handled properly with return path, or not. If
it is in it, then it works the same way as "true", if it is not, then it works
the same way as "false".
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