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README.md

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# execplan
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PostgreSQL Extension for raw query plan execution
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PostgreSQL patch & extension for raw query plan execution
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This project dedicated to parallel query execution problem.
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This project dedicated to query execution problem in DBMS for computing systems with cluster architecture.
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Parallel DBMS needs to execute an identical query plan at each computing node. It is needed for tuples redistribution during a query.
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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.
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The DBMS may need to execute an identical query plan at each computing node.
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Today PostgreSQL can process only SQL statements. But it is not guaranteed, that the planner at each node will construct same query plan, because different statistics, relation sizes e.t.c.
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This solution based on postgres-xl approach: plan tree is serialized by the nodeToString() routine.
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Further, the serialized plan transfer by new libpq routine called `PQsendPlan`.
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In this project we use postgres_fdw connections for management of sessions and remote transactions.
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Some `repeater` extension used for the demonstration of plan transfer machinery.

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