HanumathRao commented on PR #2935:
URL: https://github.com/apache/calcite/pull/2935#issuecomment-1287499498

   > > I am using the call context to get the RelMetadataQuery, I think this is 
not fully formed during the matching of the rule
   > 
   > @HanumathRao can you elaborate a bit what you mean when you say that the 
metadata query is not formed during `matches`? Both `matches` and `onMatch` 
take a `RelOptRuleCall` as parameter and in both cases 
`call.getMetadataQuery()` is available.
   
   Thanks @zabetak, I think I misunderstood your earlier comment. I thought 
that you are asking me to introduce a predicate in operand supplier itself to 
rule out the application of the rule. I fixed the code in the latest commit to 
return false for not applicable cases in matches method.


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