[jira] [Created] (IGNITE-5571) Make sure that cache-less execution works as good as cache-based

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

Vladimir Ozerov created IGNITE-5571:
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             Summary: Make sure that cache-less execution works as good as cache-based
                 Key: IGNITE-5571
                 URL: https://issues.apache.org/jira/browse/IGNITE-5571
             Project: Ignite
          Issue Type: Task
          Components: sql
            Reporter: Vladimir Ozerov
            Assignee: Alexander Paschenko
            Priority: Critical
             Fix For: 2.1


Compare the following two methods:
1) {{GridQueryProcessor.querySqlFields}} - old good entry point for query execution;
2) {{GridQueryProcessor.querySqlFieldsNoCache}} - new method for "cache-less" execution.

Note how cache context is used in the first method:
1) First, it helps determine whether query can be converted to "local"
2) Second, it gets query parallelism of current cache, and if it differs from {{1}}, then it turns on {{distributedJoins}}.

Neither of this happens in the second implementation. Moreover, I had to throw an exception for local queries, as I didn't know how to handle them properly.

We need to investigate and fix these two deficiencies somehow. Probably some inputs from [~sergi.vladykin] would be required, to understand what is going on.

Our ultimate goal is to make "cache-less" execution as good as the old one.



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