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# Foreign Data Wrapper Extension
=====================================
## Background: Foreign Data Wrappers
The SQL/MED ("Management of External Data") standard calls for extensions to SQL that allow you to access foreign data that lives outside your DBMS. For example, you may want to query a different file format (e.g., CSV, Parquet), different instance of the same DBMS (e.g., PostgreSQL on a different machine), or access remote data (e.g., S3).
PostgreSQL implements portions of the SQL/MED specification as documented in the manual (5.12). Foreign data is accessed through a foreign data wrapper (FDW). A FDW is a library that abstracts over connecting to the external data and obtaining data from it. A non-exhaustive list of some FDWs can be found in the PostgreSQL wiki.
This project write a foreign data wrapper for custom columnar file format db721.
## Roadmap
[done] Write a db721 parser
[done] Implement SELECT * for the FDW
[done] Implement support for WHERE clauses for the FDW
[done] Implement the predicate pushdown and projection pushdown
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Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch
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