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Change scoping of table and join refnames to conform to SQL92: a JOIN

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clause with an alias is a <subquery> and therefore hides table references
appearing within it, according to the spec.  This is the same as the
preliminary patch I posted to pgsql-patches yesterday, plus some really
grotty code in ruleutils.c to reverse-list a query tree with the correct
alias name depending on context.  I'd rather not have done that, but unless
we want to force another initdb for 7.1, there's no other way for now.
This commit is contained in:
Tom Lane
2001-02-14 21:35:07 +00:00
parent d42d31e78e
commit 4a66f9dd54
16 changed files with 853 additions and 501 deletions
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53
src/backend/parser/parse_target.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.64 2001/01/24 19:43:02 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.65 2001/02/14 21:35:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -212,29 +212,37 @@ updateTargetListEntry(ParseState *pstate,
*/
if (indirection)
{
Attr *att = makeAttr(pstrdup(RelationGetRelationName(rd)),
colname);
Node *arrayBase;
ArrayRef *aref;
arrayBase = ParseNestedFuncOrColumn(pstate, att, EXPR_COLUMN_FIRST);
aref = transformArraySubscripts(pstate, arrayBase,
indirection,
pstate->p_is_insert,
tle->expr);
if (pstate->p_is_insert)
{
/*
* The command is INSERT INTO table (arraycol[subscripts]) ...
* so there is not really a source array value to work with.
* Let the executor do something reasonable, if it can. Notice
* that we forced transformArraySubscripts to treat the
* subscripting op as an array-slice op above, so the source
* data will have been coerced to array type.
* that we force transformArraySubscripts to treat the
* subscripting op as an array-slice op below, so the source
* data will have been coerced to the array type.
*/
aref->refexpr = NULL; /* signal there is no source array */
arrayBase = NULL; /* signal there is no source array */
}
else
{
/*
* Build a Var for the array to be updated.
*/
arrayBase = (Node *) make_var(pstate,
pstate->p_target_rangetblentry,
attrno);
}
aref = transformArraySubscripts(pstate,
arrayBase,
attrtype,
indirection,
pstate->p_is_insert,
tle->expr);
tle->expr = (Node *) aref;
}
else
@ -385,22 +393,19 @@ checkInsertTargets(ParseState *pstate, List *cols, List **attrnos)
/* ExpandAllTables()
* Turns '*' (in the target list) into a list of targetlist entries.
*
* tlist entries are generated for each relation appearing in the FROM list,
* which by now has been transformed into a joinlist.
* tlist entries are generated for each relation appearing at the top level
* of the query's namespace, except for RTEs marked not inFromCl. (These
* may include NEW/OLD pseudo-entries, implicit RTEs, etc.)
*/
static List *
ExpandAllTables(ParseState *pstate)
{
List *target = NIL;
List *jt;
List *ns;
/* SELECT *; */
if (pstate->p_joinlist == NIL)
elog(ERROR, "Wildcard with no tables specified not allowed");
foreach(jt, pstate->p_joinlist)
foreach(ns, pstate->p_namespace)
{
Node *n = (Node *) lfirst(jt);
Node *n = (Node *) lfirst(ns);
if (IsA(n, RangeTblRef))
{
@ -431,6 +436,10 @@ ExpandAllTables(ParseState *pstate)
"\n\t%s", nodeToString(n));
}
/* Check for SELECT *; */
if (target == NIL)
elog(ERROR, "Wildcard with no tables specified not allowed");
return target;
}