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Tom Lane f5bc74192d Make GEQO's planning deterministic by having it start from a predictable ... random number seed each time. This is how it used to work years ago, but we got rid of the seed reset because it was resetting the main random() sequence and thus having undesirable effects on the rest of the system. To fix, establish a private random number state for each execution of geqo(), and initialize the state using the new GUC variable geqo_seed. People who want to experiment with different random searches can do so by changing geqo_seed, but you'll always get the same plan for the same value of geqo_seed (if holding all other planner inputs constant, of course). The new state is kept in PlannerInfo by adding a "void *" field reserved for use by join_search hooks. Most of the rather bulky code changes in this commit are just arranging to pass PlannerInfo around to all the GEQO functions (many of which formerly didn't receive it). Andres Freund, with some editorialization by Tom		16 years ago
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bitmapset.h	Update copyright for 2009.	17 years ago
execnodes.h	8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list	16 years ago
makefuncs.h	Make backend header files C++ safe	16 years ago
memnodes.h	Make backend header files C++ safe	16 years ago
nodeFuncs.h	8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list	16 years ago
nodes.h	8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list	16 years ago
params.h	Update copyright for 2009.	17 years ago
parsenodes.h	Make backend header files C++ safe	16 years ago
pg_list.h	8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list	16 years ago
plannodes.h	8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list	16 years ago
primnodes.h	Make backend header files C++ safe	16 years ago
print.h	Update copyright for 2009.	17 years ago
readfuncs.h	Update copyright for 2009.	17 years ago
relation.h	Make GEQO's planning deterministic by having it start from a predictable	16 years ago
tidbitmap.h	8.4 pgindent run, with new combined Linux/FreeBSD/MinGW typedef list	16 years ago
value.h	Update copyright for 2009.	17 years ago