database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-22 12:22:45 +03:00
Code Activity

Make the world very nearly safe for composite-type columns in tables.

Browse Source 
1. Solve the problem of not having TOAST references hiding inside composite
values by establishing the rule that toasting only goes one level deep:
a tuple can contain toasted fields, but a composite-type datum that is
to be inserted into a tuple cannot.  Enforcing this in heap_formtuple
is relatively cheap and it avoids a large increase in the cost of running
the tuptoaster during final storage of a row.
2. Fix some interesting problems in expansion of inherited queries that
reference whole-row variables.  We never really did this correctly before,
but it's now relatively painless to solve by expanding the parent's
whole-row Var into a RowExpr() selecting the proper columns from the
child.
If you dike out the preventive check in CheckAttributeType(),
composite-type columns now seem to actually work.  However, we surely
cannot ship them like this --- without I/O for composite types, you
can't get pg_dump to dump tables containing them.  So a little more
work still to do.
This commit is contained in:
Tom Lane
2004-06-05 01:55:05 +00:00
parent 8f2ea8b7b5
commit ae93e5fd6e
12 changed files with 376 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
src/backend/optimizer/util/tlist.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/util/tlist.c,v 1.64 2004/05/30 23:40:31 neilc Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/util/tlist.c,v 1.65 2004/06/05 01:55:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -17,6 +17,7 @@
#include "nodes/makefuncs.h"
#include "optimizer/tlist.h"
#include "optimizer/var.h"
#include "parser/parse_expr.h"
/*****************************************************************************
@@ -83,13 +84,28 @@ tlist_member(Node *node, List *targetlist)
* create_tl_element
* Creates a target list entry node and its associated (resdom var) pair
* with its resdom number equal to 'resdomno'.
*
* Note: the argument is almost always a Var, but occasionally not.
*/
TargetEntry *
create_tl_element(Var *var, int resdomno)
{
Oid vartype;
int32 vartypmod;
if (IsA(var, Var))
{
vartype = var->vartype;
vartypmod = var->vartypmod;
}
else
{
vartype = exprType((Node *) var);
vartypmod = exprTypmod((Node *) var);
}
return makeTargetEntry(makeResdom(resdomno,
var->vartype,
var->vartypmod,
vartype,
vartypmod,
NULL,
false),
(Expr *) var);