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pgsql-server/src backend/optimizer/geqo/geqo_e ...

From: tgl(at)postgresql(dot)org (Tom Lane)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql-server/src backend/optimizer/geqo/geqo_e ...
Date: 2002-12-16 21:30:30
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Lists: pgsql-committers
CVSROOT:	/cvsroot
Module name:	pgsql-server
Changes by:	tgl(at)postgresql(dot)org	02/12/16 16:30:30

Modified files:
	src/backend/optimizer/geqo: geqo_eval.c geqo_main.c geqo_misc.c 
	src/backend/optimizer/path: indxpath.c joinrels.c 
	src/include/optimizer: geqo.h paths.h 

Log message:
	Fix GEQO to work again in CVS tip, by being more careful about memory
	allocation in best_inner_indexscan().  While at it, simplify GEQO's
	interface to the main planner --- make_join_rel() offers exactly the
	API it really wants, whereas calling make_rels_by_clause_joins() and
	make_rels_by_clauseless_joins() required jumping through hoops.
	Rewrite gimme_tree for clarity (sometimes iteration is much better than
	recursion), and approximately halve GEQO's runtime by recognizing that
	tours of the forms (a,b,c,d,...) and (b,a,c,d,...) are equivalent
	because of symmetry in make_join_rel().

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