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@ -7,7 +7,7 @@ |
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* |
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* |
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* IDENTIFICATION |
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* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.17 1998/08/09 04:59:03 momjian Exp $ |
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* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/initsplan.c,v 1.18 1998/08/10 02:26:26 momjian Exp $ |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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@ -21,6 +21,10 @@ |
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#include "nodes/relation.h" |
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#include "nodes/makefuncs.h" |
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#include "access/htup.h" |
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#include "catalog/pg_type.h" |
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#include "utils/lsyscache.h" |
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#include "utils/palloc.h" |
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@ -36,9 +40,9 @@ |
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extern int Quiet; |
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static void add_clause_to_rels(Query *root, List *clause); |
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static void add_join_clause_info_to_rels(Query *root, CInfo *clauseinfo, |
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static void add_join_info_to_rels(Query *root, CInfo *clauseinfo, |
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List *join_relids); |
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static void add_vars_to_rels(Query *root, List *vars, List *join_relids); |
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static void add_vars_to_targetlist(Query *root, List *vars, List *join_relids); |
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static MergeOrder *mergejoinop(Expr *clause); |
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static Oid hashjoinop(Expr *clause); |
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@ -51,7 +55,7 @@ static Oid hashjoinop(Expr *clause); |
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*****************************************************************************/ |
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/*
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* initialize_rel_nodes-- |
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* init-base-rel-tlist-- |
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* Creates rel nodes for every relation mentioned in the target list |
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* 'tlist' (if a node hasn't already been created) and adds them to |
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* *query-relation-list*. Creates targetlist entries for each member of |
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@ -60,7 +64,7 @@ static Oid hashjoinop(Expr *clause); |
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* Returns nothing. |
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*/ |
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void |
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initialize_base_rels_list(Query *root, List *tlist) |
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init_base_rels_tlist(Query *root, List *tlist) |
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{ |
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List *tlist_vars = NIL; |
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List *l = NIL; |
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@ -78,7 +82,7 @@ initialize_base_rels_list(Query *root, List *tlist) |
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{ |
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Var *var; |
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Index varno; |
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RelOptInfo *result; |
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RelOptInfo *result; |
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var = (Var *) lfirst(tvar); |
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varno = var->varno; |
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@ -89,7 +93,7 @@ initialize_base_rels_list(Query *root, List *tlist) |
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} |
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/*
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* add_missing_variables_to_base_rels - |
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* add_missing-vars-to-tlist-- |
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* If we have range variable(s) in the FROM clause that does not appear |
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* in the target list nor qualifications, we add it to the base relation |
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* list. For instance, "select f.x from foo f, foo f2" is a join of f and |
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@ -97,7 +101,7 @@ initialize_base_rels_list(Query *root, List *tlist) |
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* into a join. |
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*/ |
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void |
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add_missing_vars_to_base_rels(Query *root, List *tlist) |
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add_missing_vars_to_tlist(Query *root, List *tlist) |
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{ |
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List *l; |
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int varno; |
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@ -107,16 +111,15 @@ add_missing_vars_to_base_rels(Query *root, List *tlist) |
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{ |
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RangeTblEntry *rte = (RangeTblEntry *) lfirst(l); |
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List *relids; |
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RelOptInfo *result; |
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RelOptInfo *result; |
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Var *var; |
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relids = lconsi(varno, NIL); |
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if (rte->inFromCl && |
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!rel_member(relids, root->base_relation_list_)) |
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if (rte->inFromCl && !rel_member(relids, root->base_rel_list)) |
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{ |
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var = makeVar(varno, -2, 26, -1, 0, varno, -2); |
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/* add it to base_relation_list_ */ |
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var = makeVar(varno, ObjectIdAttributeNumber, |
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OIDOID, -1, 0, varno, ObjectIdAttributeNumber); |
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/* add it to base_rel_list */ |
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result = get_base_rel(root, varno); |
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add_tl_element(result, var); |
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} |
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@ -136,7 +139,7 @@ add_missing_vars_to_base_rels(Query *root, List *tlist) |
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/*
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* initialize-qualification-- |
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* init-base-rels-qual-- |
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* Initializes ClauseInfo and JoinInfo fields of relation entries for all |
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* relations appearing within clauses. Creates new relation entries if |
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* necessary, adding them to *query-relation-list*. |
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@ -144,7 +147,7 @@ add_missing_vars_to_base_rels(Query *root, List *tlist) |
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* Returns nothing of interest. |
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*/ |
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void |
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initialize_base_rels_jinfo(Query *root, List *clauses) |
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init_base_rels_qual(Query *root, List *clauses) |
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{ |
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List *clause; |
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@ -174,7 +177,6 @@ add_clause_to_rels(Query *root, List *clause) |
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*/ |
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clause_get_relids_vars((Node *) clause, &relids, &vars); |
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clauseinfo->clause = (Expr *) clause; |
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clauseinfo->notclause = contains_not((Node *) clause); |
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clauseinfo->selectivity = 0; |
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@ -184,7 +186,7 @@ add_clause_to_rels(Query *root, List *clause) |
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if (length(relids) == 1) |
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{ |
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RelOptInfo *rel = get_base_rel(root, lfirsti(relids)); |
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RelOptInfo *rel = get_base_rel(root, lfirsti(relids)); |
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/*
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* There is only one relation participating in 'clause', so |
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@ -197,7 +199,6 @@ add_clause_to_rels(Query *root, List *clause) |
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*/ |
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if (is_funcclause((Node *) clause)) |
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{ |
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/*
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* XXX If we have a func clause set selectivity to 1/3, really |
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* need a true selectivity function. |
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@ -209,8 +210,7 @@ add_clause_to_rels(Query *root, List *clause) |
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clauseinfo->selectivity = |
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compute_clause_selec(root, (Node *) clause, NIL); |
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} |
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rel->clauseinfo = lcons(clauseinfo, |
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rel->clauseinfo); |
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rel->clauseinfo = lcons(clauseinfo, rel->clauseinfo); |
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} |
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else |
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{ |
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@ -222,7 +222,6 @@ add_clause_to_rels(Query *root, List *clause) |
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if (is_funcclause((Node *) clause)) |
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{ |
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/*
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* XXX If we have a func clause set selectivity to 1/3, really |
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* need a true selectivity function. |
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@ -232,16 +231,16 @@ add_clause_to_rels(Query *root, List *clause) |
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else |
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{ |
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clauseinfo->selectivity = |
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compute_clause_selec(root, (Node *) clause, |
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NIL); |
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compute_clause_selec(root, (Node *) clause, NIL); |
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} |
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add_join_clause_info_to_rels(root, clauseinfo, relids); |
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add_vars_to_rels(root, vars, relids); |
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add_join_info_to_rels(root, clauseinfo, relids); |
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/* we are going to be doing a join, so add var to targetlist */ |
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add_vars_to_targetlist(root, vars, relids); |
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} |
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} |
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/*
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* add-join-clause-info-to-rels-- |
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* add-join-info-to-rels-- |
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* For every relation participating in a join clause, add 'clauseinfo' to |
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* the appropriate joininfo node(creating a new one and adding it to the |
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* appropriate rel node if necessary). |
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@ -253,7 +252,7 @@ add_clause_to_rels(Query *root, List *clause) |
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* |
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*/ |
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static void |
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add_join_clause_info_to_rels(Query *root, CInfo *clauseinfo, List *join_relids) |
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add_join_info_to_rels(Query *root, CInfo *clauseinfo, List *join_relids) |
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{ |
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List *join_relid; |
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@ -269,8 +268,7 @@ add_join_clause_info_to_rels(Query *root, CInfo *clauseinfo, List *join_relids) |
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other_rels = lappendi(other_rels, lfirsti(rel)); |
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} |
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joininfo = |
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find_joininfo_node(get_base_rel(root, lfirsti(join_relid)), |
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joininfo = find_joininfo_node(get_base_rel(root, lfirsti(join_relid)), |
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other_rels); |
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joininfo->jinfoclauseinfo = |
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lcons(copyObject((void *) clauseinfo), joininfo->jinfoclauseinfo); |
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@ -279,7 +277,7 @@ add_join_clause_info_to_rels(Query *root, CInfo *clauseinfo, List *join_relids) |
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} |
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/*
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* add-vars-to-rels-- |
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* add-vars-to-targetlist-- |
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* For each variable appearing in a clause, |
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* (1) If a targetlist entry for the variable is not already present in |
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* the appropriate relation's target list, add one. |
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@ -294,11 +292,11 @@ add_join_clause_info_to_rels(Query *root, CInfo *clauseinfo, List *join_relids) |
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* Returns nothing. |
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*/ |
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static void |
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add_vars_to_rels(Query *root, List *vars, List *join_relids) |
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add_vars_to_targetlist(Query *root, List *vars, List *join_relids) |
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{ |
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Var *var; |
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List *temp = NIL; |
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RelOptInfo *rel = (RelOptInfo *) NULL; |
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RelOptInfo *rel = (RelOptInfo *) NULL; |
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TargetEntry *tlistentry; |
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foreach(temp, vars) |
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@ -319,7 +317,7 @@ add_vars_to_rels(Query *root, List *vars, List *join_relids) |
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*****************************************************************************/ |
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/*
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* initialize-join-clause-info-- |
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* init-join-info-- |
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* Set the MergeJoinable or HashJoinable field for every joininfo node |
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* (within a rel node) and the MergeJoinOrder or HashJoinOp field for |
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* each clauseinfo node(within a joininfo node) for all relations in a |
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@ -328,12 +326,12 @@ add_vars_to_rels(Query *root, List *vars, List *join_relids) |
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* Returns nothing. |
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*/ |
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void |
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initialize_join_clause_info(List *rel_list) |
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init_join_info(List *rel_list) |
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{ |
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List *x, |
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*y, |
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*z; |
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RelOptInfo *rel; |
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RelOptInfo *rel; |
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JInfo *joininfo; |
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CInfo *clauseinfo; |
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Expr *clause; |
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@ -348,7 +346,7 @@ initialize_join_clause_info(List *rel_list) |
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{ |
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clauseinfo = (CInfo *) lfirst(z); |
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clause = clauseinfo->clause; |
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if (join_clause_p((Node *) clause)) |
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if (is_joinable((Node *) clause)) |
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{ |
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MergeOrder *sortop = (MergeOrder *) NULL; |
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Oid hashop = (Oid) NULL; |
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Bruce Momjian
28 years ago