database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-09-02 04:21:28 +03:00
Code Activity

TABLESAMPLE, SQL Standard and extensible

Browse Source 
Add a TABLESAMPLE clause to SELECT statements that allows
user to specify random BERNOULLI sampling or block level
SYSTEM sampling. Implementation allows for extensible
sampling functions to be written, using a standard API.
Basic version follows SQLStandard exactly. Usable
concrete use cases for the sampling API follow in later
commits.

Petr Jelinek

Reviewed by Michael Paquier and Simon Riggs
This commit is contained in:
Simon Riggs
2015-05-15 14:37:10 -04:00
parent 11a83bbedd
commit f6d208d6e5
66 changed files with 2756 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/include/port.h
View File

@@ -357,6 +357,10 @@ extern off_t ftello(FILE *stream);
#endif
#endif
#define RAND48_SEED_0 (0x330e)
#define RAND48_SEED_1 (0xabcd)
#define RAND48_SEED_2 (0x1234)
extern double pg_erand48(unsigned short xseed[3]);
extern long pg_lrand48(void);
extern void pg_srand48(long seed);