Create README.md

Author: Andrey Lepikhov

README.md

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+# execplan
+PostgreSQL Extension for raw query plan execution
+
+This project dedicated to parallel query execution problem.
+
+Parallel DBMS needs to execute an identical query plan at each computing node. It is needed for tuples redistribution during a query.
+Today PostgreSQL can process only SQL strings. But it is not guaranteed, that the planner at each node will construct same query plan, because different statistics, relation sizes e.t.c.