Github user nonstop-qfchen commented on a diff in the pull request:
https://github.com/apache/incubator-trafodion/pull/144#discussion_r42894238
--- Diff: core/sql/optimizer/ScanOptimizer.cpp ---
@@ -8590,6 +8595,7 @@ void MDAMCostWA::compute()
// // invalidate the cache
// disjunctsFR_.reset();
// disjunctsLR_.reset();
+ MDAM_DEBUG0(MTL2, "Mdam scan lost due to exceeding cost bound");
--- End diff --
Yes, these debug messages can help with narrow down the problem quickly.
On Fri, Oct 23, 2015 at 12:48 PM, DaveBirdsall <[email protected]>
wrote:
> In core/sql/optimizer/ScanOptimizer.cpp
>
<https://github.com/apache/incubator-trafodion/pull/144#discussion_r42893715>
> :
>
> > @@ -8590,6 +8595,7 @@ void MDAMCostWA::compute()
> > // // invalidate the cache
> > // disjunctsFR_.reset();
> > // disjunctsLR_.reset();
> > + MDAM_DEBUG0(MTL2, "Mdam scan lost due to exceeding cost
bound");
>
> I LOVE this kind of debugging aid.
>
> â
> Reply to this email directly or view it on GitHub
> <https://github.com/apache/incubator-trafodion/pull/144/files#r42893715>.
>
--
Regards, --Qifan
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