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Add contrib/file_fdw foreign-data wrapper for reading files via COPY.
This is both very useful in its own right, and an important test case for the core FDW support. This commit includes a small refactoring of copy.c to expose its option checking code as a separately callable function. The original patch submission duplicated hundreds of lines of that code, which seemed pretty unmaintainable. Shigeru Hanada, reviewed by Itagaki Takahiro and Tom Lane
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‎contrib/Makefile

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@@ -18,6 +18,7 @@ SUBDIRS = \
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dict_xsyn \
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dummy_seclabel \
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earthdistance \
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file_fdw \
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fuzzystrmatch \
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hstore \
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intagg \

‎contrib/README

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Functions for computing distances between two points on Earth
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by Bruno Wolff III <bruno@wolff.to> and Hal Snyder <hal@vailsys.com>
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file_fdw
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Foreign-data wrapper for server-side CSV/TEXT files
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by Shigeru Hanada <hanada@metrosystems.co.jp>
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fuzzystrmatch -
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Levenshtein, metaphone, and soundex fuzzy string matching
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by Joe Conway <mail@joeconway.com> and Joel Burton <jburton@scw.org>

‎contrib/file_fdw/.gitignore

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# Generated subdirectories
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/results/

‎contrib/file_fdw/Makefile

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# contrib/file_fdw/Makefile
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MODULES = file_fdw
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EXTENSION = file_fdw
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DATA = file_fdw--1.0.sql
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REGRESS = file_fdw
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EXTRA_CLEAN = sql/file_fdw.sql expected/file_fdw.out
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ifdef USE_PGXS
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PG_CONFIG = pg_config
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PGXS := $(shell $(PG_CONFIG) --pgxs)
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include $(PGXS)
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else
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subdir = contrib/file_fdw
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top_builddir = ../..
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include $(top_builddir)/src/Makefile.global
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include $(top_srcdir)/contrib/contrib-global.mk
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endif

‎contrib/file_fdw/data/agg.bad

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‎contrib/file_fdw/data/agg.csv

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‎contrib/file_fdw/data/agg.data

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‎contrib/file_fdw/expected/.gitignore

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/file_fdw.out

‎contrib/file_fdw/file_fdw--1.0.sql

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/* contrib/file_fdw/file_fdw--1.0.sql */
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CREATE FUNCTION file_fdw_handler()
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RETURNS fdw_handler
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT;
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CREATE FUNCTION file_fdw_validator(text[], oid)
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RETURNS void
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AS 'MODULE_PATHNAME'
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LANGUAGE C STRICT;
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CREATE FOREIGN DATA WRAPPER file_fdw
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HANDLER file_fdw_handler
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VALIDATOR file_fdw_validator;

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