[jira] [Created] (IGNITE-13136) Calcite integration. Improve join predicate testing.

["Roman Kondakov (Jira)" <ji...@apache.org>]

Roman Kondakov created IGNITE-13136:
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             Summary: Calcite integration. Improve join predicate testing.
                 Key: IGNITE-13136
                 URL: https://issues.apache.org/jira/browse/IGNITE-13136
             Project: Ignite
          Issue Type: Improvement
          Components: sql
            Reporter: Roman Kondakov


Currently we have to merge joining rows in order to test a join predicate:
{code:java}
    Row row = handler.concat(left, rightMaterialized.get(rightIdx++));

    if (!cond.test(row))
        continue;
{code}
it results in unconditional building a joining row even if it will not be emitted to downstream further. To avoid extra GC pressure we need to test the join predicate before joining rows:
{code:java}
    if (!cond.test(left, right))
        continue;

    Row row = handler.concat(left, right);
{code}



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