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| author | Dean Rasheed <dean.a.rasheed@gmail.com> | 2024-03-27 10:12:39 +0000 |
|---|---|---|
| committer | Dean Rasheed <dean.a.rasheed@gmail.com> | 2024-03-27 10:12:39 +0000 |
| commit | e6341323a8da64b18e9af3e75a4578230702d61c (patch) | |
| tree | f04f8e7fa84af4b569e58c85d2a7d98f65f45303 /src/include/utils/numeric.h | |
| parent | 818861eb578663a0d4d8d7dc4e18c96a148b3c75 (diff) | |
| download | postgresql-e6341323a8da64b18e9af3e75a4578230702d61c.tar.gz postgresql-e6341323a8da64b18e9af3e75a4578230702d61c.zip | |
Add functions to generate random numbers in a specified range.
This adds 3 new variants of the random() function:
random(min integer, max integer) returns integer
random(min bigint, max bigint) returns bigint
random(min numeric, max numeric) returns numeric
Each returns a random number x in the range min <= x <= max.
For the numeric function, the number of digits after the decimal point
is equal to the number of digits that "min" or "max" has after the
decimal point, whichever has more.
The main entry points for these functions are in a new C source file.
The existing random(), random_normal(), and setseed() functions are
moved there too, so that they can all share the same PRNG state, which
is kept private to that file.
Dean Rasheed, reviewed by Jian He, David Zhang, Aleksander Alekseev,
and Tomas Vondra.
Discussion: https://postgr.es/m/CAEZATCV89Vxuq93xQdmc0t-0Y2zeeNQTdsjbmV7dyFBPykbV4Q@mail.gmail.com
Diffstat (limited to 'src/include/utils/numeric.h')
| -rw-r--r-- | src/include/utils/numeric.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/include/utils/numeric.h b/src/include/utils/numeric.h index 2f7184e299b..43c75c436fe 100644 --- a/src/include/utils/numeric.h +++ b/src/include/utils/numeric.h @@ -14,6 +14,7 @@ #ifndef _PG_NUMERIC_H_ #define _PG_NUMERIC_H_ +#include "common/pg_prng.h" #include "fmgr.h" /* @@ -103,4 +104,7 @@ extern Numeric numeric_mod_opt_error(Numeric num1, Numeric num2, extern int32 numeric_int4_opt_error(Numeric num, bool *have_error); extern int64 numeric_int8_opt_error(Numeric num, bool *have_error); +extern Numeric random_numeric(pg_prng_state *state, + Numeric rmin, Numeric rmax); + #endif /* _PG_NUMERIC_H_ */ |