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Patch to make postgres_fdw parallel-safe

This patch makes the postgres_fdw foreign data wrapper parallel-safe so that shards stored on remote servers can be accessed in parallel via a Parallel Append plan node.

Note, that the patch is experimental.

To compile and use the patch follow these instructions:

  1. Get the PostgreSQL source code, for example via
    • git clone https://github.com/postgres/postgres.git --depth=1 or
    • apt-get source postgresql-11 and sudo apt-get build-dep postgresql-11
  2. Apply the patch from this repository to contrib/postgres_fdw/postgres_fdw.c
  3. Compile PostgreSQL
  4. Copy postgres_fdw.so to /usr/lib/postgresql/11/lib/
  5. Restart PostgreSQL

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Patch for postgres_fdw foreign data wrapper to be parallel-safe

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