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Add a transform function for varbit typmod coercisions.

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This enables ALTER TABLE to skip table and index rebuilds when the
new type is unconstraint varbit, or when the allowable number of bits
is not decreasing.

Noah Misch, with review and a fix for an OID collision by me.
This commit is contained in:
Robert Haas
2012-02-07 12:41:42 -05:00
parent 3cc0800829
commit f7d7dade8a
4 changed files with 40 additions and 2 deletions
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src/include/utils/varbit.h
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@@ -72,6 +72,7 @@ extern Datum varbit_send(PG_FUNCTION_ARGS);
extern Datum varbittypmodin(PG_FUNCTION_ARGS);
extern Datum varbittypmodout(PG_FUNCTION_ARGS);
extern Datum bit(PG_FUNCTION_ARGS);
extern Datum varbit_transform(PG_FUNCTION_ARGS);
extern Datum varbit(PG_FUNCTION_ARGS);
extern Datum biteq(PG_FUNCTION_ARGS);
extern Datum bitne(PG_FUNCTION_ARGS);