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Posted to issues@beam.apache.org by "Alireza Samadianzakaria (JIRA)" <ji...@apache.org> on 2019/07/25 21:24:00 UTC

[jira] [Created] (BEAM-7823) Implementing Custom MetadataHandler for NonCumulativeCost

Alireza Samadianzakaria created BEAM-7823:
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             Summary: Implementing Custom MetadataHandler for NonCumulativeCost
                 Key: BEAM-7823
                 URL: https://issues.apache.org/jira/browse/BEAM-7823
             Project: Beam
          Issue Type: New Feature
          Components: dsl-sql
            Reporter: Alireza Samadianzakaria
            Assignee: Alireza Samadianzakaria


Currently we use Calcite Handler for NonCumulativeCost. We need to implement our own handler before implementing our own Cost model because of the following reasons:

1- We need to empty the MetadataQuery cache every time that we need to get the new cost. 

2- We need to have our own method for estimating the costs instead of computeSelfCost. This is because currently we cannot set the costFactory in JDBC path and therefore that path still uses Calcite's cost model; later if we set the costFactory correctly there, we may decide to override computeSelfCost instead.



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