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Document table statistics support in PostgreSQL connector #11887

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Apr 9, 2022
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Document table statistics support in PostgreSQL connector #11887

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30 changes: 29 additions & 1 deletion docs/src/main/sphinx/connector/postgresql.rst
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Expand Up @@ -207,10 +207,38 @@ statements, the connector supports the following features:

.. include:: alter-schema-limitation.fragment


Performance
-----------

The connector includes a number of performance improvements, detailed in the
following sections.

.. _postgresql-table-statistics:

Table statistics
^^^^^^^^^^^^^^^^

The PostgreSQL connector can use :doc:`table and column statistics
</optimizer/statistics>` for :doc:`cost based optimizations
</optimizer/cost-based-optimizations>`, to improve query processing performance
based on the actual data in the data source.

The statistics are collected by PostgreSQL and retrieved by the connector.

To collect statistics for a table, execute the following statement in
PostgreSQL.

.. code-block:: text

ANALYZE table_schema.table_name;

Refer to PostgreSQL documentation for additional ``ANALYZE`` options.

.. _postgresql-pushdown:

Pushdown
--------
^^^^^^^^

The connector supports pushdown for a number of operations:

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