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Allow LEAKPROOF functions for better performance of security views.

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We don't normally allow quals to be pushed down into a view created
with the security_barrier option, but functions without side effects
are an exception: they're OK.  This allows much better performance in
common cases, such as when using an equality operator (that might
even be indexable).

There is an outstanding issue here with the CREATE FUNCTION / ALTER
FUNCTION syntax: there's no way to use ALTER FUNCTION to unset the
leakproof flag.  But I'm committing this as-is so that it doesn't
have to be rebased again; we can fix up the grammar in a future
commit.

KaiGai Kohei, with some wordsmithing by me.
This commit is contained in:
Robert Haas
2012-02-13 22:20:27 -05:00
parent 2bbd88f8f8
commit cd30728fb2
28 changed files with 3329 additions and 2427 deletions
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src/include/utils/lsyscache.h
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@@ -91,6 +91,7 @@ extern Oid get_func_signature(Oid funcid, Oid **argtypes, int *nargs);
extern bool get_func_retset(Oid funcid);
extern bool func_strict(Oid funcid);
extern char func_volatile(Oid funcid);
extern bool get_func_leakproof(Oid funcid);
extern float4 get_func_cost(Oid funcid);
extern float4 get_func_rows(Oid funcid);
extern Oid get_relname_relid(const char *relname, Oid relnamespace);