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Replace planner's representation of relation sets, per pghackers discussion.

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Instead of Lists of integers, we now store variable-length bitmap sets.
This should be faster as well as less error-prone.
This commit is contained in:
Tom Lane
2003-02-08 20:20:55 +00:00
parent 893678eda7
commit c15a4c2aef
35 changed files with 1453 additions and 626 deletions
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55
src/backend/optimizer/util/var.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.48 2003/02/06 22:21:11 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.49 2003/02/08 20:20:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -24,7 +24,7 @@
typedef struct
{
List *varlist;
Relids varnos;
int sublevels_up;
} pull_varnos_context;
@ -58,13 +58,12 @@ static bool pull_var_clause_walker(Node *node,
pull_var_clause_context *context);
static Node *flatten_join_alias_vars_mutator(Node *node,
flatten_join_alias_vars_context *context);
static List *alias_rtindex_list(Query *root, List *rtlist);
static Relids alias_relid_set(Query *root, Relids relids);
/*
* pull_varnos
*
* Create a list of all the distinct varnos present in a parsetree.
* pull_varnos
* Create a set of all the distinct varnos present in a parsetree.
* Only varnos that reference level-zero rtable entries are considered.
*
* NOTE: this is used on not-yet-planned expressions. It may therefore find
@ -72,12 +71,12 @@ static List *alias_rtindex_list(Query *root, List *rtlist);
* references to the desired rtable level! But when we find a completed
* SubPlan, we only need to look at the parameters passed to the subplan.
*/
List *
Relids
pull_varnos(Node *node)
{
pull_varnos_context context;
context.varlist = NIL;
context.varnos = NULL;
context.sublevels_up = 0;
/*
@ -89,7 +88,7 @@ pull_varnos(Node *node)
(void *) &context,
0);
return context.varlist;
return context.varnos;
}
static bool
@ -101,9 +100,8 @@ pull_varnos_walker(Node *node, pull_varnos_context *context)
{
Var *var = (Var *) node;
if (var->varlevelsup == context->sublevels_up &&
!intMember(var->varno, context->varlist))
context->varlist = lconsi(var->varno, context->varlist);
if (var->varlevelsup == context->sublevels_up)
context->varnos = bms_add_member(context->varnos, var->varno);
return false;
}
if (IsA(node, Query))
@ -430,13 +428,13 @@ flatten_join_alias_vars_mutator(Node *node,
ininfo = (InClauseInfo *) expression_tree_mutator(node,
flatten_join_alias_vars_mutator,
(void *) context);
/* now fix InClauseInfo's rtindex lists */
/* now fix InClauseInfo's relid sets */
if (context->sublevels_up == 0)
{
ininfo->lefthand = alias_rtindex_list(context->root,
ininfo->lefthand);
ininfo->righthand = alias_rtindex_list(context->root,
ininfo->righthand);
ininfo->lefthand = alias_relid_set(context->root,
ininfo->lefthand);
ininfo->righthand = alias_relid_set(context->root,
ininfo->righthand);
}
return (Node *) ininfo;
}
@ -462,25 +460,26 @@ flatten_join_alias_vars_mutator(Node *node,
}
/*
* alias_rtindex_list: in a list of RT indexes, replace joins by their
* alias_relid_set: in a set of RT indexes, replace joins by their
* underlying base relids
*/
static List *
alias_rtindex_list(Query *root, List *rtlist)
static Relids
alias_relid_set(Query *root, Relids relids)
{
List *result = NIL;
List *l;
Relids result = NULL;
Relids tmprelids;
int rtindex;
foreach(l, rtlist)
tmprelids = bms_copy(relids);
while ((rtindex = bms_first_member(tmprelids)) >= 0)
{
int rtindex = lfirsti(l);
RangeTblEntry *rte;
RangeTblEntry *rte = rt_fetch(rtindex, root->rtable);
rte = rt_fetch(rtindex, root->rtable);
if (rte->rtekind == RTE_JOIN)
result = nconc(result, get_relids_for_join(root, rtindex));
result = bms_join(result, get_relids_for_join(root, rtindex));
else
result = lappendi(result, rtindex);
result = bms_add_member(result, rtindex);
}
bms_free(tmprelids);
return result;
}