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Ensure that the resolved datatype of any unknown Param is propagated

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into the sub-SELECT targetlist when it appears in the context
INSERT INTO foo SELECT $1 ...  Per report from Abhijit Menon-Sen.
This commit is contained in:
Tom Lane 2005-02-19 19:33:42 +00:00
parent 42e386f257
commit 2df2c3dca2
1 changed files with 33 additions and 6 deletions
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39
src/backend/parser/analyze.c
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@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.290.2.2 2004/11/17 00:18:26 neilc Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/analyze.c,v 1.290.2.3 2005/02/19 19:33:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -498,6 +498,8 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
List **extras_before, List **extras_after)
{
Query *qry = makeNode(Query);
Query *selectQuery = NULL;
bool copy_up_hack = false;
List *sub_rtable;
List *sub_namespace;
List *icolumns;
@ -552,7 +554,6 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
* be able to see.
*/
ParseState *sub_pstate = make_parsestate(pstate);
Query *selectQuery;
RangeTblEntry *rte;
RangeTblRef *rtr;
@ -599,7 +600,7 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
Assert(rte == rt_fetch(rtr->rtindex, pstate->p_rtable));
pstate->p_joinlist = lappend(pstate->p_joinlist, rtr);
/*
/*----------
* Generate a targetlist for the INSERT that selects all the
* non-resjunk columns from the subquery. (We need this to be
* separate from the subquery's tlist because we may add columns,
@ -609,8 +610,9 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
* 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
* special cases in coerce_type). Otherwise, this fails: INSERT
* INTO foo SELECT 'bar', ... FROM baz
* special cases in coerce_type). Otherwise, this fails:
* INSERT INTO foo SELECT 'bar', ... FROM baz
*----------
*/
qry->targetList = NIL;
foreach(tl, selectQuery->targetList)
@ -622,9 +624,12 @@ transformInsertStmt(ParseState *pstate, InsertStmt *stmt,
if (resnode->resjunk)
continue;
if (tle->expr &&
(IsA(tle->expr, Const) ||IsA(tle->expr, Param)) &&
(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,
@ -698,6 +703,28 @@ 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);