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https://issues.apache.org/jira/browse/CALCITE-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16498685#comment-16498685
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Julian Hyde commented on CALCITE-2345:
--------------------------------------

Let's not worry too much about performance. Suppose it takes say 10 seconds to 
populate the in-memory fake with 30,000 records; we can live with that. We can 
share a fake between multiple tests, so we only pay the 10 seconds once.

Once we have the IT and Unit tests consolidated and passing, if there's still a 
performance problem we could consider downsizing the data set to say 100 
records (and fix test results accordingly).

I don't think foodmart is a good data set for testing mongo. We need some 
nested data to show off mongo's features. (And by the way, foodmart contains 
~876,000 records, and a simple test can run in under 10s, so if fongo and 
hsqldb have comparable performance we're in good shape.)

> add tests using Fongo to Mongo Adapter
> --------------------------------------
>
>                 Key: CALCITE-2345
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2345
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Andrei Sereda
>            Assignee: Michael Mior
>            Priority: Major
>
> Better test coverage for unit tests using 
> [Fongo|https://github.com/fakemongo/fongo] which is in-memory implementation 
> of Mongo API.



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