database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-12-21 05:21:08 +03:00
Code Activity

Parallel executor support.

Browse Source 
This code provides infrastructure for a parallel leader to start up
parallel workers to execute subtrees of the plan tree being executed
in the master.  User-supplied parameters from ParamListInfo are passed
down, but PARAM_EXEC parameters are not.  Various other constructs,
such as initplans, subplans, and CTEs, are also not currently shared.
Nevertheless, there's enough here to support a basic implementation of
parallel query, and we can lift some of the current restrictions as
needed.

Amit Kapila and Robert Haas
This commit is contained in:
Robert Haas
2015-09-28 21:55:57 -04:00
parent 0557dc276f
commit d1b7c1ffe7
17 changed files with 1007 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
src/include/utils/datum.h
View File

@@ -46,4 +46,14 @@ extern Datum datumTransfer(Datum value, bool typByVal, int typLen);
extern bool datumIsEqual(Datum value1, Datum value2,
bool typByVal, int typLen);
/*
* Serialize and restore datums so that we can transfer them to parallel
* workers.
*/
extern Size datumEstimateSpace(Datum value, bool isnull, bool typByVal,
int typLen);
extern void datumSerialize(Datum value, bool isnull, bool typByVal,
int typLen, char **start_address);
extern Datum datumRestore(char **start_address, bool *isnull);
#endif /* DATUM_H */