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Add support for multi-row VALUES clauses as part of INSERT statements

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(e.g. "INSERT ... VALUES (...), (...), ...") and elsewhere as allowed
by the spec. (e.g. similar to a FROM clause subselect). initdb required.
Joe Conway and Tom Lane.
This commit is contained in:
Joe Conway
2006-08-02 01:59:48 +00:00
parent d307c428cb
commit 9caafda579
40 changed files with 1877 additions and 313 deletions
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123
src/backend/parser/parse_relation.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/parser/parse_relation.c,v 1.123 2006/04/30 18:30:39 tgl Exp $
* $PostgreSQL: pgsql/src/backend/parser/parse_relation.c,v 1.124 2006/08/02 01:59:47 joe Exp $
*
*-------------------------------------------------------------------------
*/
@ -940,6 +940,75 @@ addRangeTableEntryForFunction(ParseState *pstate,
return rte;
}
/*
* Add an entry for a VALUES list to the pstate's range table (p_rtable).
*
* This is much like addRangeTableEntry() except that it makes a values RTE.
*/
RangeTblEntry *
addRangeTableEntryForValues(ParseState *pstate,
List *exprs,
Alias *alias,
bool inFromCl)
{
RangeTblEntry *rte = makeNode(RangeTblEntry);
char *refname = alias ? alias->aliasname : pstrdup("*VALUES*");
Alias *eref;
int numaliases;
int numcolumns;
rte->rtekind = RTE_VALUES;
rte->relid = InvalidOid;
rte->subquery = NULL;
rte->values_lists = exprs;
rte->alias = alias;
eref = alias ? copyObject(alias) : makeAlias(refname, NIL);
/* fill in any unspecified alias columns */
numcolumns = list_length((List *) linitial(exprs));
numaliases = list_length(eref->colnames);
while (numaliases < numcolumns)
{
char attrname[64];
numaliases++;
snprintf(attrname, sizeof(attrname), "column%d", numaliases);
eref->colnames = lappend(eref->colnames,
makeString(pstrdup(attrname)));
}
if (numcolumns < numaliases)
ereport(ERROR,
(errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
errmsg("VALUES lists \"%s\" have %d columns available but %d columns specified",
refname, numcolumns, numaliases)));
rte->eref = eref;
/*----------
* Flags:
* - this RTE should be expanded to include descendant tables,
* - this RTE is in the FROM clause,
* - this RTE should be checked for appropriate access rights.
*
* Subqueries are never checked for access rights.
*----------
*/
rte->inh = false; /* never true for values RTEs */
rte->inFromCl = inFromCl;
rte->requiredPerms = 0;
rte->checkAsUser = InvalidOid;
/*
* Add completed RTE to pstate's range table list, but not to join list
* nor namespace --- caller must do that if appropriate.
*/
if (pstate != NULL)
pstate->p_rtable = lappend(pstate->p_rtable, rte);
return rte;
}
/*
* Add an entry for a join to the pstate's range table (p_rtable).
*
@ -1233,6 +1302,41 @@ expandRTE(RangeTblEntry *rte, int rtindex, int sublevels_up,
}
}
break;
case RTE_VALUES:
{
/* Values RTE */
ListCell *aliasp_item = list_head(rte->eref->colnames);
ListCell *lc;
varattno = 0;
foreach(lc, (List *) linitial(rte->values_lists))
{
Node *col = (Node *) lfirst(lc);
varattno++;
if (colnames)
{
/* Assume there is one alias per column */
char *label = strVal(lfirst(aliasp_item));
*colnames = lappend(*colnames,
makeString(pstrdup(label)));
aliasp_item = lnext(aliasp_item);
}
if (colvars)
{
Var *varnode;
varnode = makeVar(rtindex, varattno,
exprType(col),
exprTypmod(col),
sublevels_up);
*colvars = lappend(*colvars, varnode);
}
}
}
break;
case RTE_JOIN:
{
/* Join RTE */
@ -1569,6 +1673,20 @@ get_rte_attribute_type(RangeTblEntry *rte, AttrNumber attnum,
}
}
break;
case RTE_VALUES:
{
/* Values RTE --- get type info from first sublist */
List *collist = (List *) linitial(rte->values_lists);
Node *col;
if (attnum < 1 || attnum > list_length(collist))
elog(ERROR, "values list %s does not have attribute %d",
rte->eref->aliasname, attnum);
col = (Node *) list_nth(collist, attnum-1);
*vartype = exprType(col);
*vartypmod = exprTypmod(col);
}
break;
case RTE_JOIN:
{
/*
@ -1619,7 +1737,8 @@ get_rte_attribute_is_dropped(RangeTblEntry *rte, AttrNumber attnum)
}
break;
case RTE_SUBQUERY:
/* Subselect RTEs never have dropped columns */
case RTE_VALUES:
/* Subselect and Values RTEs never have dropped columns */
result = false;
break;
case RTE_JOIN: