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Add GetForeignColumnOptions() to foreign.c, and add some documentation.

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GetForeignColumnOptions provides some abstraction for accessing
column-specific FDW options, on a par with the access functions that were
already provided here for other FDW-related information.

Adjust file_fdw.c to use GetForeignColumnOptions instead of equivalent
hand-rolled code.

In addition, add some SGML documentation for the functions exported by
foreign.c that are meant for use by FDW authors.

(This is the fdw_helper portion of the proposed pgsql_fdw patch.)

Hanada Shigeru, reviewed by KaiGai Kohei
This commit is contained in:
Tom Lane
2012-03-07 18:20:58 -05:00
parent cf7026b64b
commit 9088d1b965
4 changed files with 154 additions and 39 deletions
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src/include/foreign/foreign.h
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@@ -76,6 +76,8 @@ extern ForeignDataWrapper *GetForeignDataWrapperByName(const char *name,
bool missing_ok);
extern ForeignTable *GetForeignTable(Oid relid);
extern List *GetForeignColumnOptions(Oid relid, AttrNumber attnum);
extern Oid get_foreign_data_wrapper_oid(const char *fdwname, bool missing_ok);
extern Oid get_foreign_server_oid(const char *servername, bool missing_ok);