[jira] [Created] (IGNITE-6020) SQL: client should request first pages on query execution instead of first cursor read

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

Vladimir Ozerov created IGNITE-6020:
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             Summary: SQL: client should request first pages on query execution instead of first cursor read
                 Key: IGNITE-6020
                 URL: https://issues.apache.org/jira/browse/IGNITE-6020
             Project: Ignite
          Issue Type: Bug
          Components: sql
    Affects Versions: 2.1
            Reporter: Vladimir Ozerov
             Fix For: 2.2


Currently we request first data blocks form server nodes on first cursor access. However, user code might want to execute a query, and access the cursor after some delay, in hope that asynchronous execution will do the trick. 

For this reason, we should start requesting pages eagerly on "execute" command rather than on cursor access.

{code}
try (QueryCursor cursor = cache.execute(...)) { // <-- Should be here
    ...
    for (List<Object> row : cursor) {           // <-- But currently here
        ...
    }
}
{code}



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