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From "Vladimir Ozerov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-6945) SQL: optionally do not copy offheap rows for local SqlQuery
Date Fri, 17 Nov 2017 09:34:01 GMT
Vladimir Ozerov created IGNITE-6945:
---------------------------------------

             Summary: SQL: optionally do not copy offheap rows for local SqlQuery
                 Key: IGNITE-6945
                 URL: https://issues.apache.org/jira/browse/IGNITE-6945
             Project: Ignite
          Issue Type: Task
      Security Level: Public (Viewable by anyone)
          Components: sql
            Reporter: Vladimir Ozerov
            Assignee: Taras Ledkov
             Fix For: 2.4


Currently when iterating over rows we eagerly materialize them [1]. If key or value are large
enough, we could loose a lot of time on offheap-heap copying. To partially mitigate this,
we can do the following:
1) Add new flag {{SqlQuery.localNoCopy}} which is applicable only for local queries.
2) When enabled we will not copy final {{_KEY}} and {{_VAL}} columns to heap. but rather wrap
them into {{BinaryOffheapObjectImpl}}
3) These rows must be released when query iterator switches to the next row.

[1] {{H2RowFactory.getRow}}



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