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author | Tom Lane <tgl@sss.pgh.pa.us> | 2003-01-25 23:10:30 +0000 |
---|---|---|
committer | Tom Lane <tgl@sss.pgh.pa.us> | 2003-01-25 23:10:30 +0000 |
commit | 9f5f2124754ccd605671bfe952c220b46a0e730b (patch) | |
tree | e6be6eab43ffe733b9c785d62cec74497098c694 /src | |
parent | 15ab7a87206d657a4182d2932970384d540004d0 (diff) | |
download | postgresql-9f5f2124754ccd605671bfe952c220b46a0e730b.tar.gz postgresql-9f5f2124754ccd605671bfe952c220b46a0e730b.zip |
Allow the planner to collapse explicit inner JOINs together, rather than
necessarily following the JOIN syntax to develop the query plan. The old
behavior is still available by setting GUC variable JOIN_COLLAPSE_LIMIT
to 1. Also create a GUC variable FROM_COLLAPSE_LIMIT to control the
similar decision about when to collapse sub-SELECT lists into their parent
lists. (This behavior existed already, but the limit was always
GEQO_THRESHOLD/2; now it's separately adjustable.)
Diffstat (limited to 'src')
-rw-r--r-- | src/backend/optimizer/path/allpaths.c | 9 | ||||
-rw-r--r-- | src/backend/optimizer/plan/planner.c | 18 | ||||
-rw-r--r-- | src/backend/optimizer/prep/prepjointree.c | 101 | ||||
-rw-r--r-- | src/backend/utils/misc/guc.c | 16 | ||||
-rw-r--r-- | src/backend/utils/misc/postgresql.conf.sample | 3 | ||||
-rw-r--r-- | src/bin/psql/tab-complete.c | 4 | ||||
-rw-r--r-- | src/include/optimizer/paths.h | 9 | ||||
-rw-r--r-- | src/include/optimizer/prep.h | 5 | ||||
-rw-r--r-- | src/test/regress/expected/join.out | 1600 |
9 files changed, 928 insertions, 837 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index f85144b8184..6c40a16e32a 100644 --- a/src/backend/optimizer/path/allpaths.c +++ b/src/backend/optimizer/path/allpaths.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.94 2003/01/20 18:54:49 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/optimizer/path/allpaths.c,v 1.95 2003/01/25 23:10:27 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -30,8 +30,9 @@ #include "rewrite/rewriteManip.h" -bool enable_geqo = true; -int geqo_rels = DEFAULT_GEQO_RELS; +/* These parameters are set by GUC */ +bool enable_geqo = false; /* just in case GUC doesn't set it */ +int geqo_threshold; static void set_base_rel_pathlists(Query *root); @@ -422,7 +423,7 @@ make_fromexpr_rel(Query *root, FromExpr *from) * Consider the different orders in which we could join the rels, * using either GEQO or regular optimizer. */ - if (enable_geqo && levels_needed >= geqo_rels) + if (enable_geqo && levels_needed >= geqo_threshold) return geqo(root, levels_needed, initial_rels); else return make_one_rel_by_joins(root, levels_needed, initial_rels); diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c index 388380f8843..1b481ccbd25 100644 --- a/src/backend/optimizer/plan/planner.c +++ b/src/backend/optimizer/plan/planner.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.141 2003/01/20 18:54:52 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.142 2003/01/25 23:10:27 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -167,12 +167,6 @@ subquery_planner(Query *parse, double tuple_fraction) pull_up_subqueries(parse, (Node *) parse->jointree, false); /* - * If so, we may have created opportunities to simplify the jointree. - */ - parse->jointree = (FromExpr *) - preprocess_jointree(parse, (Node *) parse->jointree); - - /* * Detect whether any rangetable entries are RTE_JOIN kind; if not, * we can avoid the expense of doing flatten_join_alias_vars(). * This must be done after we have done pull_up_subqueries, of course. @@ -247,6 +241,16 @@ subquery_planner(Query *parse, double tuple_fraction) parse->havingQual = (Node *) newHaving; /* + * See if we can simplify the jointree; opportunities for this may come + * from having pulled up subqueries, or from flattening explicit JOIN + * syntax. We must do this after flattening JOIN alias variables, since + * eliminating explicit JOIN nodes from the jointree will cause + * get_relids_for_join() to fail. + */ + parse->jointree = (FromExpr *) + preprocess_jointree(parse, (Node *) parse->jointree); + + /* * Do the main planning. If we have an inherited target relation, * that needs special processing, else go straight to * grouping_planner. diff --git a/src/backend/optimizer/prep/prepjointree.c b/src/backend/optimizer/prep/prepjointree.c index 083528c0490..68fbb1e1f53 100644 --- a/src/backend/optimizer/prep/prepjointree.c +++ b/src/backend/optimizer/prep/prepjointree.c @@ -9,14 +9,13 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepjointree.c,v 1.1 2003/01/20 18:54:54 tgl Exp $ + * $Header: /cvsroot/pgsql/src/backend/optimizer/prep/prepjointree.c,v 1.2 2003/01/25 23:10:27 tgl Exp $ * *------------------------------------------------------------------------- */ #include "postgres.h" #include "optimizer/clauses.h" -#include "optimizer/paths.h" #include "optimizer/prep.h" #include "optimizer/subselect.h" #include "optimizer/var.h" @@ -24,6 +23,11 @@ #include "rewrite/rewriteManip.h" +/* These parameters are set by GUC */ +int from_collapse_limit; +int join_collapse_limit; + + static bool is_simple_subquery(Query *subquery); static bool has_nullable_targetlist(Query *subquery); static void resolvenew_in_jointree(Node *jtnode, int varno, List *subtlist); @@ -467,7 +471,16 @@ resolvenew_in_jointree(Node *jtnode, int varno, List *subtlist) * case we can consider collapsing the two FromExprs into one. This is * an optional conversion, since the planner will work correctly either * way. But we may find a better plan (at the cost of more planning time) - * if we merge the two nodes. + * if we merge the two nodes, creating a single join search space out of + * two. To allow the user to trade off planning time against plan quality, + * we provide a control parameter from_collapse_limit that limits the size + * of the join search space that can be created this way. + * + * We also consider flattening explicit inner JOINs into FromExprs (which + * will in turn allow them to be merged into parent FromExprs). The tradeoffs + * here are the same as for flattening FromExprs, but we use a different + * control parameter so that the user can use explicit JOINs to control the + * join order even when they are inner JOINs. * * NOTE: don't try to do this in the same jointree scan that does subquery * pullup! Since we're changing the jointree structure here, that wouldn't @@ -492,7 +505,7 @@ preprocess_jointree(Query *parse, Node *jtnode) { Node *child = (Node *) lfirst(l); - /* Recursively simplify the child... */ + /* Recursively simplify this child... */ child = preprocess_jointree(parse, child); /* Now, is it a FromExpr? */ if (child && IsA(child, FromExpr)) @@ -500,21 +513,25 @@ preprocess_jointree(Query *parse, Node *jtnode) /* * Yes, so do we want to merge it into parent? Always do * so if child has just one element (since that doesn't - * make the parent's list any longer). Otherwise we have - * to be careful about the increase in planning time - * caused by combining the two join search spaces into - * one. Our heuristic is to merge if the merge will - * produce a join list no longer than GEQO_RELS/2. - * (Perhaps need an additional user parameter?) + * make the parent's list any longer). Otherwise merge if + * the resulting join list would be no longer than + * from_collapse_limit. */ FromExpr *subf = (FromExpr *) child; int childlen = length(subf->fromlist); int myothers = length(newlist) + length(lnext(l)); - if (childlen <= 1 || (childlen + myothers) <= geqo_rels / 2) + if (childlen <= 1 || + (childlen + myothers) <= from_collapse_limit) { newlist = nconc(newlist, subf->fromlist); - f->quals = make_and_qual(subf->quals, f->quals); + /* + * By now, the quals have been converted to implicit-AND + * lists, so we just need to join the lists. NOTE: we + * put the pulled-up quals first. + */ + f->quals = (Node *) nconc((List *) subf->quals, + (List *) f->quals); } else newlist = lappend(newlist, child); @@ -528,9 +545,64 @@ preprocess_jointree(Query *parse, Node *jtnode) { JoinExpr *j = (JoinExpr *) jtnode; - /* Can't usefully change the JoinExpr, but recurse on children */ + /* Recursively simplify the children... */ j->larg = preprocess_jointree(parse, j->larg); j->rarg = preprocess_jointree(parse, j->rarg); + /* + * If it is an outer join, we must not flatten it. An inner join + * is semantically equivalent to a FromExpr; we convert it to one, + * allowing it to be flattened into its parent, if the resulting + * FromExpr would have no more than join_collapse_limit members. + */ + if (j->jointype == JOIN_INNER && join_collapse_limit > 1) + { + int leftlen, + rightlen; + + if (j->larg && IsA(j->larg, FromExpr)) + leftlen = length(((FromExpr *) j->larg)->fromlist); + else + leftlen = 1; + if (j->rarg && IsA(j->rarg, FromExpr)) + rightlen = length(((FromExpr *) j->rarg)->fromlist); + else + rightlen = 1; + if ((leftlen + rightlen) <= join_collapse_limit) + { + FromExpr *f = makeNode(FromExpr); + + f->fromlist = NIL; + f->quals = NULL; + + if (j->larg && IsA(j->larg, FromExpr)) + { + FromExpr *subf = (FromExpr *) j->larg; + + f->fromlist = subf->fromlist; + f->quals = subf->quals; + } + else + f->fromlist = makeList1(j->larg); + + if (j->rarg && IsA(j->rarg, FromExpr)) + { + FromExpr *subf = (FromExpr *) j->rarg; + + f->fromlist = nconc(f->fromlist, + subf->fromlist); + f->quals = (Node *) nconc((List *) f->quals, + (List *) subf->quals); + } + else + f->fromlist = lappend(f->fromlist, j->rarg); + + /* pulled-up quals first */ + f->quals = (Node *) nconc((List *) f->quals, + (List *) j->quals); + + return (Node *) f; + } + } } else elog(ERROR, "preprocess_jointree: unexpected node type %d", @@ -615,6 +687,9 @@ get_relids_in_jointree(Node *jtnode) /* * get_relids_for_join: get list of base RT indexes making up a join + * + * NB: this will not work reliably after preprocess_jointree() is run, + * since that may eliminate join nodes from the jointree. */ List * get_relids_for_join(Query *parse, int joinrelid) diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c index 471d895ea72..9b726dcfe32 100644 --- a/src/backend/utils/misc/guc.c +++ b/src/backend/utils/misc/guc.c @@ -5,7 +5,7 @@ * command, configuration file, and command line options. * See src/backend/utils/misc/README for more information. * - * $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.110 2003/01/10 22:03:29 petere Exp $ + * $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.111 2003/01/25 23:10:27 tgl Exp $ * * Copyright 2000 by PostgreSQL Global Development Group * Written by Peter Eisentraut <peter_e@gmx.net>. @@ -37,7 +37,7 @@ #include "optimizer/cost.h" #include "optimizer/geqo.h" #include "optimizer/paths.h" -#include "optimizer/planmain.h" +#include "optimizer/prep.h" #include "parser/parse_expr.h" #include "storage/fd.h" #include "storage/freespace.h" @@ -539,8 +539,16 @@ static struct config_int 10, 1, 1000, NULL, NULL }, { - {"geqo_threshold", PGC_USERSET}, &geqo_rels, - DEFAULT_GEQO_RELS, 2, INT_MAX, NULL, NULL + {"from_collapse_limit", PGC_USERSET}, &from_collapse_limit, + 8, 1, INT_MAX, NULL, NULL + }, + { + {"join_collapse_limit", PGC_USERSET}, &join_collapse_limit, + 8, 1, INT_MAX, NULL, NULL + }, + { + {"geqo_threshold", PGC_USERSET}, &geqo_threshold, + 11, 2, INT_MAX, NULL, NULL }, { {"geqo_pool_size", PGC_USERSET}, &Geqo_pool_size, diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample index 41750b9e229..515eec9acae 100644 --- a/src/backend/utils/misc/postgresql.conf.sample +++ b/src/backend/utils/misc/postgresql.conf.sample @@ -94,6 +94,9 @@ #cpu_index_tuple_cost = 0.001 # (same) #cpu_operator_cost = 0.0025 # (same) +#from_collapse_limit = 8 +#join_collapse_limit = 8 # 1 disables collapsing of explicit JOINs + #default_statistics_target = 10 # range 1-1000 # diff --git a/src/bin/psql/tab-complete.c b/src/bin/psql/tab-complete.c index e6972537536..efebd2f6b6f 100644 --- a/src/bin/psql/tab-complete.c +++ b/src/bin/psql/tab-complete.c @@ -3,7 +3,7 @@ * * Copyright 2000-2002 by PostgreSQL Global Development Group * - * $Header: /cvsroot/pgsql/src/bin/psql/tab-complete.c,v 1.71 2003/01/10 22:03:30 petere Exp $ + * $Header: /cvsroot/pgsql/src/bin/psql/tab-complete.c,v 1.72 2003/01/25 23:10:30 tgl Exp $ */ /*---------------------------------------------------------------------- @@ -252,6 +252,7 @@ psql_completion(char *text, int start, int end) "explain_pretty_print", "extra_float_digits", "fixbtree", + "from_collapse_limit", "fsync", "geqo", "geqo_effort", @@ -260,6 +261,7 @@ psql_completion(char *text, int start, int end) "geqo_random_seed", "geqo_selection_bias", "geqo_threshold", + "join_collapse_limit", "log_hostname", "krb_server_keyfile", "lc_messages", diff --git a/src/include/optimizer/paths.h b/src/include/optimizer/paths.h index 76285bac408..8b4f701744e 100644 --- a/src/include/optimizer/paths.h +++ b/src/include/optimizer/paths.h @@ -8,7 +8,7 @@ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: paths.h,v 1.64 2003/01/24 03:58:43 tgl Exp $ + * $Id: paths.h,v 1.65 2003/01/25 23:10:30 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -18,16 +18,11 @@ #include "nodes/relation.h" -/* default GEQO threshold (default value for geqo_rels) */ -/* If you change this, update backend/utils/misc/postgresql.sample.conf */ -#define DEFAULT_GEQO_RELS 11 - - /* * allpaths.c */ extern bool enable_geqo; -extern int geqo_rels; +extern int geqo_threshold; extern RelOptInfo *make_one_rel(Query *root); extern RelOptInfo *make_fromexpr_rel(Query *root, FromExpr *from); diff --git a/src/include/optimizer/prep.h b/src/include/optimizer/prep.h index 17ecb4d593f..458539a8174 100644 --- a/src/include/optimizer/prep.h +++ b/src/include/optimizer/prep.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: prep.h,v 1.34 2003/01/20 18:55:05 tgl Exp $ + * $Id: prep.h,v 1.35 2003/01/25 23:10:30 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -20,6 +20,9 @@ /* * prototypes for prepjointree.c */ +extern int from_collapse_limit; +extern int join_collapse_limit; + extern Node *pull_up_IN_clauses(Query *parse, Node *node); extern Node *pull_up_subqueries(Query *parse, Node *jtnode, bool below_outer_join); diff --git a/src/test/regress/expected/join.out b/src/test/regress/expected/join.out index 6e1a21a03e1..e04a90e0721 100644 --- a/src/test/regress/expected/join.out +++ b/src/test/regress/expected/join.out @@ -660,895 +660,895 @@ SELECT '' AS "xxx", * xxx | i | j | t | i | k | i | k -----+---+---+-------+---+----+---+---- | 1 | 4 | one | 1 | -1 | 1 | -1 - | 1 | 4 | one | 1 | -1 | 2 | 2 - | 1 | 4 | one | 1 | -1 | 3 | -3 - | 1 | 4 | one | 1 | -1 | 2 | 4 - | 1 | 4 | one | 1 | -1 | 5 | -5 - | 1 | 4 | one | 1 | -1 | 5 | -5 - | 1 | 4 | one | 1 | -1 | 0 | - | 1 | 4 | one | 1 | -1 | | - | 1 | 4 | one | 1 | -1 | | 0 - | 1 | 4 | one | 2 | 2 | 1 | -1 - | 1 | 4 | one | 2 | 2 | 2 | 2 - | 1 | 4 | one | 2 | 2 | 3 | -3 - | 1 | 4 | one | 2 | 2 | 2 | 4 - | 1 | 4 | one | 2 | 2 | 5 | -5 - | 1 | 4 | one | 2 | 2 | 5 | -5 - | 1 | 4 | one | 2 | 2 | 0 | - | 1 | 4 | one | 2 | 2 | | - | 1 | 4 | one | 2 | 2 | | 0 - | 1 | 4 | one | 3 | -3 | 1 | -1 - | 1 | 4 | one | 3 | -3 | 2 | 2 - | 1 | 4 | one | 3 | -3 | 3 | -3 - | 1 | 4 | one | 3 | -3 | 2 | 4 - | 1 | 4 | one | 3 | -3 | 5 | -5 - | 1 | 4 | one | 3 | -3 | 5 | -5 - | 1 | 4 | one | 3 | -3 | 0 | - | 1 | 4 | one | 3 | -3 | | - | 1 | 4 | one | 3 | -3 | | 0 - | 1 | 4 | one | 2 | 4 | 1 | -1 - | 1 | 4 | one | 2 | 4 | 2 | 2 - | 1 | 4 | one | 2 | 4 | 3 | -3 - | 1 | 4 | one | 2 | 4 | 2 | 4 - | 1 | 4 | one | 2 | 4 | 5 | -5 - | 1 | 4 | one | 2 | 4 | 5 | -5 - | 1 | 4 | one | 2 | 4 | 0 | - | 1 | 4 | one | 2 | 4 | | - | 1 | 4 | one | 2 | 4 | | 0 - | 1 | 4 | one | 5 | -5 | 1 | -1 - | 1 | 4 | one | 5 | -5 | 2 | 2 - | 1 | 4 | one | 5 | -5 | 3 | -3 - | 1 | 4 | one | 5 | -5 | 2 | 4 - | 1 | 4 | one | 5 | -5 | 5 | -5 - | 1 | 4 | one | 5 | -5 | 5 | -5 - | 1 | 4 | one | 5 | -5 | 0 | - | 1 | 4 | one | 5 | -5 | | - | 1 | 4 | one | 5 | -5 | | 0 - | 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