apache / apache/beam

Make JDBC operation counts correct

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dsl new feature P3 sql
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Description

We are currently using attempted metrics for JDBC counts. This may produce the wrong result.

Per Kenn's Comment:

We probably want to spend some time on the best way to get reliable counts that are meaningful in the way that JDBC expects. I think the SQL <-\> IO adapter may have to own it, for those Beam connectors that do things like write "mutations" that are not rows at all, etc.

Imported from Jira [BEAM-4202](https://issues.apache.org/jira/browse/BEAM-4202). Original Jira may contain additional context.
Reported by: apilloud.

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