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GROUP BY queries with a self-join (join to the same table) that were grouped by columns with indexes returned the wrong result in some cases.

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A file system implementation can now be registered. The database file system moved to the test section.

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Queries that are ordered by an indexed column returned no rows in certain cases (if all rows were deleted from the table previously, and there is a low number of rows in the table, and when not using other conditions, and when using the default b tree index).

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When using the built-in connection pool, connections were not rolled back and autocommit was not enabled after closing.

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