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Support varlena fields with single-byte headers and unaligned storage.

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This commit breaks any code that assumes that the mere act of forming a tuple
(without writing it to disk) does not "toast" any fields.  While all available
regression tests pass, I'm not totally sure that we've fixed every nook and
cranny, especially in contrib.

Greg Stark with some help from Tom Lane
This commit is contained in:
Tom Lane
2007-04-06 04:21:44 +00:00
parent d44163953c
commit 3e23b68dac
38 changed files with 1802 additions and 805 deletions
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17
src/backend/utils/fmgr/fmgr.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/fmgr/fmgr.c,v 1.105 2007/03/27 23:21:10 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/fmgr/fmgr.c,v 1.106 2007/04/06 04:21:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1962,7 +1962,7 @@ struct varlena *
pg_detoast_datum(struct varlena * datum)
{
if (VARATT_IS_EXTENDED(datum))
return (struct varlena *) heap_tuple_untoast_attr((varattrib *) datum);
return heap_tuple_untoast_attr(datum);
else
return datum;
}
@@ -1971,7 +1971,7 @@ struct varlena *
pg_detoast_datum_copy(struct varlena * datum)
{
if (VARATT_IS_EXTENDED(datum))
return (struct varlena *) heap_tuple_untoast_attr((varattrib *) datum);
return heap_tuple_untoast_attr(datum);
else
{
/* Make a modifiable copy of the varlena object */
@@ -1987,7 +1987,16 @@ struct varlena *
pg_detoast_datum_slice(struct varlena * datum, int32 first, int32 count)
{
/* Only get the specified portion from the toast rel */
return (struct varlena *) heap_tuple_untoast_attr_slice((varattrib *) datum, first, count);
return heap_tuple_untoast_attr_slice(datum, first, count);
}
struct varlena *
pg_detoast_datum_packed(struct varlena * datum)
{
if (VARATT_IS_COMPRESSED(datum) || VARATT_IS_EXTERNAL(datum))
return heap_tuple_untoast_attr(datum);
else
return datum;
}
/*-------------------------------------------------------------------------