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Change on-disk representation of NUMERIC datatype so that the sign_dscale 

word comes before the weight instead of after.  This will allow future
binary-compatible extension of the representation to support compact formats,
as discussed on pgsql-hackers around 2007/06/18.  The reason to do it now is
that we've already pretty well broken any chance of simple in-place upgrade
from 8.2 to 8.3, but it's possible that 8.3 to 8.4 (or whenever we get around
to squeezing NUMERIC) could otherwise be data-compatible.
This commit is contained in:
Tom Lane 2007-09-25 22:21:55 +00:00
parent 7a315a09dc
commit f828f878e9
2 changed files with 5 additions and 5 deletions
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4
src/include/catalog/catversion.h
View File

@ -37,7 +37,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.428 2007/09/25 20:03:38 tgl Exp $
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.429 2007/09/25 22:21:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -53,6 +53,6 @@
*/
/* yyyymmddN */
#define CATALOG_VERSION_NO 200709241
#define CATALOG_VERSION_NO 200709251
#endif

6
src/include/utils/numeric.h
View File

@ -7,7 +7,7 @@
*
* Copyright (c) 1998-2007, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/include/utils/numeric.h,v 1.24 2007/02/27 23:48:10 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/numeric.h,v 1.25 2007/09/25 22:21:55 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -63,14 +63,14 @@
typedef struct NumericData
{
int32 vl_len_; /* varlena header (do not touch directly!) */
int16 n_weight; /* Weight of 1st digit */
uint16 n_sign_dscale; /* Sign + display scale */
int16 n_weight; /* Weight of 1st digit */
char n_data[1]; /* Digits (really array of NumericDigit) */
} NumericData;
typedef NumericData *Numeric;
#define NUMERIC_HDRSZ (VARHDRSZ + sizeof(int16) + sizeof(uint16))
#define NUMERIC_HDRSZ (VARHDRSZ + sizeof(uint16) + sizeof(int16))
/*