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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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15
src/include/access/htup.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/access/htup.h,v 1.92 2007/02/27 23:48:09 tgl Exp $
* $PostgreSQL: pgsql/src/include/access/htup.h,v 1.93 2007/04/06 04:21:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -160,9 +160,8 @@ typedef HeapTupleHeaderData *HeapTupleHeader;
#define HEAP_HASNULL 0x0001 /* has null attribute(s) */
#define HEAP_HASVARWIDTH 0x0002 /* has variable-width attribute(s) */
#define HEAP_HASEXTERNAL 0x0004 /* has external stored attribute(s) */
#define HEAP_HASCOMPRESSED 0x0008 /* has compressed stored attribute(s) */
#define HEAP_HASEXTENDED 0x000C /* the two above combined */
#define HEAP_HASOID 0x0010 /* has an object-id field */
#define HEAP_HASOID 0x0008 /* has an object-id field */
/* bit 0x0010 is available */
#define HEAP_COMBOCID 0x0020 /* t_cid is a combo cid */
#define HEAP_XMAX_EXCL_LOCK 0x0040 /* xmax is exclusive locker */
#define HEAP_XMAX_SHARED_LOCK 0x0080 /* xmax is shared locker */
@@ -341,7 +340,7 @@ do { \
* MaxAttrSize is a somewhat arbitrary upper limit on the declared size of
* data fields of char(n) and similar types. It need not have anything
* directly to do with the *actual* upper limit of varlena values, which
* is currently 1Gb (see struct varattrib in postgres.h). I've set it
* is currently 1Gb (see TOAST structures in postgres.h). I've set it
* at 10Mb which seems like a reasonable number --- tgl 8/6/00.
*/
#define MaxAttrSize (10 * 1024 * 1024)
@@ -485,12 +484,6 @@ typedef HeapTupleData *HeapTuple;
#define HeapTupleHasExternal(tuple) \
(((tuple)->t_data->t_infomask & HEAP_HASEXTERNAL) != 0)
#define HeapTupleHasCompressed(tuple) \
(((tuple)->t_data->t_infomask & HEAP_HASCOMPRESSED) != 0)
#define HeapTupleHasExtended(tuple) \
(((tuple)->t_data->t_infomask & HEAP_HASEXTENDED) != 0)
#define HeapTupleGetOid(tuple) \
HeapTupleHeaderGetOid((tuple)->t_data)