[jira] [Created] (PHOENIX-4964) ORDER BY does not use an index if the query is not fully covered

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

Lars Hofhansl created PHOENIX-4964:
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             Summary: ORDER BY does not use an index if the query is not fully covered
                 Key: PHOENIX-4964
                 URL: https://issues.apache.org/jira/browse/PHOENIX-4964
             Project: Phoenix
          Issue Type: Improvement
            Reporter: Lars Hofhansl


I just noticed that a query like
{{SELECT <column1> FROM <table> ORDER BY <column2> LIMIT <n>}}

Does not use an index on <column2> if it does not also include <column1>. That seems too limited.
I can see the code in QueryOptimizer.addPlan that rewrites the plan only when there's a WHERE clause, and then only for the WHERE clause. 



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