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Major planner/optimizer revision: get rid of PathOrder node type,

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store all ordering information in pathkeys lists (which are now lists of
lists of PathKeyItem nodes, not just lists of lists of vars).  This was
a big win --- the code is smaller and IMHO more understandable than it
was, even though it handles more cases.  I believe the node changes will
not force an initdb for anyone; planner nodes don't show up in stored
rules.
This commit is contained in:
Tom Lane
1999-08-16 02:17:58 +00:00
parent 08320bfb22
commit e6381966c1
43 changed files with 1937 additions and 3270 deletions
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41
src/backend/optimizer/util/clauses.c
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@@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.46 1999/08/12 04:32:54 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/clauses.c,v 1.47 1999/08/16 02:17:56 tgl Exp $
*
* HISTORY
* AUTHOR DATE MAJOR EVENT
@@ -164,7 +164,7 @@ make_funcclause(Func *func, List *funcargs)
{
Expr *expr = makeNode(Expr);
expr->typeOid = InvalidOid; /* assume type checking done */
expr->typeOid = func->functype;
expr->opType = FUNC_EXPR;
expr->oper = (Node *) func;
expr->args = funcargs;
@@ -416,43 +416,6 @@ NumRelids(Node *clause)
return result;
}
/*
* is_joinable
*
* Returns t iff 'clause' is a valid join clause.
*
*/
bool
is_joinable(Node *clause)
{
Node *leftop,
*rightop;
if (!is_opclause(clause))
return false;
leftop = (Node *) get_leftop((Expr *) clause);
rightop = (Node *) get_rightop((Expr *) clause);
if (!rightop)
return false; /* unary opclauses need not apply */
/*
* One side of the clause (i.e. left or right operands) must either be
* a var node ...
*/
if (IsA(leftop, Var) || IsA(rightop, Var))
return true;
/*
* ... or a func node.
*/
if (is_funcclause(leftop) || is_funcclause(rightop))
return true;
return false;
}
/*
* fix_opids
* Calculate opid field from opno for each Oper node in given tree.