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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2008-04-04 18:45:36 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2008-04-04 18:45:36 +0000 |
| commit | a0fad9762a22e739de69c85b51ff7a47e672732f (patch) | |
| tree | 9224424c35267ba173351e4a59aea8fc2714d3c7 /src/include/utils/builtins.h | |
| parent | b6f0ad4b0ed7942654a26f04ca167cd2fe3c5d41 (diff) | |
| download | postgresql-a0fad9762a22e739de69c85b51ff7a47e672732f.tar.gz postgresql-a0fad9762a22e739de69c85b51ff7a47e672732f.zip | |
Re-implement division for numeric values using the traditional "schoolbook"
algorithm. This is a good deal slower than our old roundoff-error-prone
code for long inputs, so we keep the old code for use in the transcendental
functions, where everything is approximate anyway. Also create a
user-accessible function div(numeric, numeric) to provide access to the
exact result of trunc(x/y) --- since the regular numeric / operator will
round off its result, simply computing that expression in SQL doesn't
reliably give the desired answer. This fixes bug #3387 and various related
corner cases, and improves the usefulness of PG for high-precision integer
arithmetic.
Diffstat (limited to 'src/include/utils/builtins.h')
| -rw-r--r-- | src/include/utils/builtins.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/include/utils/builtins.h b/src/include/utils/builtins.h index f80802f9bff..c14fcab72e8 100644 --- a/src/include/utils/builtins.h +++ b/src/include/utils/builtins.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.311 2008/04/04 16:57:21 momjian Exp $ + * $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.312 2008/04/04 18:45:36 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -845,6 +845,7 @@ extern Datum numeric_add(PG_FUNCTION_ARGS); extern Datum numeric_sub(PG_FUNCTION_ARGS); extern Datum numeric_mul(PG_FUNCTION_ARGS); extern Datum numeric_div(PG_FUNCTION_ARGS); +extern Datum numeric_div_trunc(PG_FUNCTION_ARGS); extern Datum numeric_mod(PG_FUNCTION_ARGS); extern Datum numeric_inc(PG_FUNCTION_ARGS); extern Datum numeric_smaller(PG_FUNCTION_ARGS); |