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| author | Bruce Momjian <bruce@momjian.us> | 2003-12-01 21:52:38 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 2003-12-01 21:52:38 +0000 |
| commit | 04a4821adef38155b7920ba9eb83c4c3c29156f8 (patch) | |
| tree | c778c2d286441d98a2453f06f5af9c2b214ffc3e /src/backend/utils/adt/int8.c | |
| parent | af03663878b257f7fb93a80eec03a8dd070b22b7 (diff) | |
| download | postgresql-04a4821adef38155b7920ba9eb83c4c3c29156f8.tar.gz postgresql-04a4821adef38155b7920ba9eb83c4c3c29156f8.zip | |
Attached is a patch implementing factorial(), returning numeric. Points
to note:
1) arttype is numeric. I thought this was the best way of allowing
arbitarily large factorials, even though factorial(2^63) is a large
number. Happy to change to integers if this is overkill.
2) since we're accepting numeric arguments, the patch tests for floats.
If a numeric is passed with non-zero decimal portion, an error is raised
since (from memory) they are undefined.
Gavin Sherry
Diffstat (limited to 'src/backend/utils/adt/int8.c')
| -rw-r--r-- | src/backend/utils/adt/int8.c | 22 |
1 files changed, 1 insertions, 21 deletions
diff --git a/src/backend/utils/adt/int8.c b/src/backend/utils/adt/int8.c index 616ceaaf9db..016330a0533 100644 --- a/src/backend/utils/adt/int8.c +++ b/src/backend/utils/adt/int8.c @@ -7,7 +7,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/utils/adt/int8.c,v 1.49 2003/11/29 19:51:58 pgsql Exp $ + * $PostgreSQL: pgsql/src/backend/utils/adt/int8.c,v 1.50 2003/12/01 21:52:37 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -561,26 +561,6 @@ int8mod(PG_FUNCTION_ARGS) PG_RETURN_INT64(result); } -/* int8fac() - * Factorial - */ -Datum -int8fac(PG_FUNCTION_ARGS) -{ - int64 arg1 = PG_GETARG_INT64(0); - int64 result; - int64 i; - - if (arg1 == 0) - result = 1; - else if (arg1 < 1) - result = 0; - else - for (i = arg1, result = 1; i > 0; --i) - result *= i; - - PG_RETURN_INT64(result); -} Datum int8inc(PG_FUNCTION_ARGS) |