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Merge Resdom nodes into TargetEntry nodes to simplify code and save a

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few palloc's.  I also chose to eliminate the restype and restypmod fields
entirely, since they are redundant with information stored in the node's
contained expression; re-examining the expression at need seems simpler
and more reliable than trying to keep restype/restypmod up to date.

initdb forced due to change in contents of stored rules.
This commit is contained in:
Tom Lane
2005-04-06 16:34:07 +00:00
parent 0f3748a28c
commit ad161bcc8a
43 changed files with 537 additions and 799 deletions
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96
src/backend/parser/analyze.c
View File

@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.316 2005/03/10 23:21:23 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/analyze.c,v 1.317 2005/04/06 16:34:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -438,15 +438,12 @@ transformViewStmt(ParseState *pstate, ViewStmt *stmt,
foreach(targetList, stmt->query->targetList)
{
TargetEntry *te = (TargetEntry *) lfirst(targetList);
Resdom *rd;
Assert(IsA(te, TargetEntry));
rd = te->resdom;
Assert(IsA(rd, Resdom));
/* junk columns don't get aliases */
if (rd->resjunk)
if (te->resjunk)
continue;
rd->resname = pstrdup(strVal(lfirst(alist_item)));
te->resname = pstrdup(strVal(lfirst(alist_item)));
alist_item = lnext(alist_item);
if (alist_item == NULL)
break; /* done assigning aliases */
@@ -507,7 +504,6 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
{
Query *qry = makeNode(Query);
Query *selectQuery = NULL;
bool copy_up_hack = false;
List *sub_rtable;
List *sub_namespace;
List *icolumns;
@@ -615,7 +611,7 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
* separate from the subquery's tlist because we may add columns,
* insert datatype coercions, etc.)
*
* HACK: unknown-type constants and params in the INSERT's targetlist
* HACK: unknown-type constants and params in the SELECT's targetlist
* are copied up as-is rather than being referenced as subquery
* outputs. This is to ensure that when we try to coerce them to
* the target column's datatype, the right things happen (see
@@ -627,28 +623,25 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
foreach(tl, selectQuery->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(tl);
Resdom *resnode = tle->resdom;
Expr *expr;
if (resnode->resjunk)
if (tle->resjunk)
continue;
if (tle->expr &&
(IsA(tle->expr, Const) || IsA(tle->expr, Param)) &&
exprType((Node *) tle->expr) == UNKNOWNOID)
{
expr = tle->expr;
copy_up_hack = true;
}
else
expr = (Expr *) makeVar(rtr->rtindex,
resnode->resno,
resnode->restype,
resnode->restypmod,
tle->resno,
exprType((Node *) tle->expr),
exprTypmod((Node *) tle->expr),
0);
resnode = copyObject(resnode);
resnode->resno = (AttrNumber) pstate->p_next_resno++;
qry->targetList = lappend(qry->targetList,
makeTargetEntry(resnode, expr));
tle = makeTargetEntry(expr,
(AttrNumber) pstate->p_next_resno++,
tle->resname,
false);
qry->targetList = lappend(qry->targetList, tle);
}
}
else
@@ -690,7 +683,7 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
col = (ResTarget *) lfirst(icols);
Assert(IsA(col, ResTarget));
Assert(!tle->resdom->resjunk);
Assert(!tle->resjunk);
updateTargetListEntry(pstate, tle, col->name, lfirst_int(attnos),
col->indirection);
@@ -708,28 +701,6 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("INSERT has more target columns than expressions")));
/*
* If we copied up any unknown Params (see HACK above) then their
* resolved types need to be propagated into the Resdom nodes of
* the sub-INSERT's tlist. One hack begets another :-(
*/
if (copy_up_hack)
{
foreach(tl, selectQuery->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(tl);
Resdom *resnode = tle->resdom;
if (resnode->resjunk)
continue;
if (resnode->restype == UNKNOWNOID)
{
resnode->restype = exprType((Node *) tle->expr);
resnode->restypmod = exprTypmod((Node *) tle->expr);
}
}
}
/* done building the range table and jointree */
qry->rtable = pstate->p_rtable;
qry->jointree = makeFromExpr(pstate->p_joinlist, NULL);
@@ -2007,26 +1978,23 @@ transformSetOperationStmt(ParseState *pstate, SelectStmt *stmt)
foreach(dtlist, sostmt->colTypes)
{
Oid colType = lfirst_oid(dtlist);
Resdom *leftResdom;
TargetEntry *lefttle = (TargetEntry *) lfirst(left_tlist);
char *colName;
Resdom *resdom;
TargetEntry *tle;
Expr *expr;
leftResdom = ((TargetEntry *) lfirst(left_tlist))->resdom;
Assert(!leftResdom->resjunk);
colName = pstrdup(leftResdom->resname);
resdom = makeResdom((AttrNumber) pstate->p_next_resno++,
colType,
-1,
colName,
false);
Assert(!lefttle->resjunk);
colName = pstrdup(lefttle->resname);
expr = (Expr *) makeVar(leftmostRTI,
leftResdom->resno,
lefttle->resno,
colType,
-1,
0);
qry->targetList = lappend(qry->targetList,
makeTargetEntry(resdom, expr));
tle = makeTargetEntry(expr,
(AttrNumber) pstate->p_next_resno++,
colName,
false);
qry->targetList = lappend(qry->targetList, tle);
targetvars = lappend(targetvars, expr);
targetnames = lappend(targetnames, makeString(colName));
left_tlist = lnext(left_tlist);
@@ -2284,11 +2252,10 @@ getSetColTypes(ParseState *pstate, Node *node)
foreach(tl, selectQuery->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(tl);
Resdom *resnode = tle->resdom;
if (resnode->resjunk)
if (tle->resjunk)
continue;
result = lappend_oid(result, resnode->restype);
result = lappend_oid(result, exprType((Node *) tle->expr));
}
return result;
}
@@ -2324,8 +2291,8 @@ applyColumnNames(List *dst, List *src)
TargetEntry *d = (TargetEntry *) lfirst(dst_item);
ColumnDef *s = (ColumnDef *) lfirst(src_item);
Assert(d->resdom && !d->resdom->resjunk);
d->resdom->resname = pstrdup(s->colname);
Assert(!d->resjunk);
d->resname = pstrdup(s->colname);
}
}
@@ -2383,10 +2350,9 @@ transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt)
foreach(tl, qry->targetList)
{
TargetEntry *tle = (TargetEntry *) lfirst(tl);
Resdom *resnode = tle->resdom;
ResTarget *origTarget;
if (resnode->resjunk)
if (tle->resjunk)
{
/*
* Resjunk nodes need no additional processing, but be sure
@@ -2394,8 +2360,8 @@ transformUpdateStmt(ParseState *pstate, UpdateStmt *stmt)
* rewriter or planner might get confused. They don't need a
* resname either.
*/
resnode->resno = (AttrNumber) pstate->p_next_resno++;
resnode->resname = NULL;
tle->resno = (AttrNumber) pstate->p_next_resno++;
tle->resname = NULL;
continue;
}
if (origTargetList == NULL)