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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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5
src/backend/optimizer/path/pathkeys.c
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@ -11,7 +11,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/path/pathkeys.c,v 1.59 2004/06/01 03:02:52 tgl Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/path/pathkeys.c,v 1.60 2004/06/05 01:55:04 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -725,7 +725,8 @@ find_indexkey_var(Query *root, RelOptInfo *rel, AttrNumber varattno)
{
Var *var = (Var *) lfirst(temp);
if (var->varattno == varattno)
if (IsA(var, Var) &&
var->varattno == varattno)
return var;
}