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

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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
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13
src/backend/optimizer/path/costsize.c
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@@ -49,7 +49,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.129 2004/06/01 03:02:52 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/costsize.c,v 1.130 2004/06/05 01:55:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1704,11 +1704,18 @@ set_rel_width(Query *root, RelOptInfo *rel)
foreach(tllist, rel->reltargetlist)
{
Var *var = (Var *) lfirst(tllist);
int ndx = var->varattno - rel->min_attr;
int ndx;
Oid relid;
int32 item_width;
Assert(IsA(var, Var));
/* For now, punt on whole-row child Vars */
if (!IsA(var, Var))
{
tuple_width += 32; /* arbitrary */
continue;
}
ndx = var->varattno - rel->min_attr;
/*
* The width probably hasn't been cached yet, but may as well