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The patch that is applied at the end of the email makes sure that these 

conditions are always met. The patch can be applied to any version
of Postgres95 from 1.02 to 1.05. After applying the patch, queries
using indices on bpchar and varchar fields should (hopefully ;-) )
always return the same tuple set regardless to the fact whether
indices are used or not.

Submitted by: Gerhard Reithofer <tbr_laa@AON.AT>
This commit is contained in:
Marc G. Fournier 1996-08-26 20:38:52 +00:00
parent e78fe652f4
commit 491b9b89c4
1 changed files with 38 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
src/backend/utils/adt/varchar.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.2 1996/07/15 19:11:23 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.3 1996/08/26 20:38:52 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@ -245,13 +245,18 @@ int32
bpcharle(char *arg1, char *arg2)
{
int len1, len2;
int cmp;
if (arg1 == NULL || arg2 == NULL)
return((int32) 0);
len1 = bcTruelen(arg1);
len2 = bcTruelen(arg2);
return(strncmp(arg1+4, arg2+4, Min(len1,len2)) <= 0);
cmp = strncmp(arg1+4, arg2+4, Min(len1,len2));
if (0 == cmp)
return (int32)(len1 <= len2 ? 1 : 0);
else
return (int32)(cmp <= 0);
}
int32
@ -276,24 +281,34 @@ int32
bpcharge(char *arg1, char *arg2)
{
int len1, len2;
int cmp;
if (arg1 == NULL || arg2 == NULL)
return((int32) 0);
len1 = bcTruelen(arg1);
len2 = bcTruelen(arg2);
return(strncmp(arg1+4, arg2+4, Min(len1,len2)) >= 0);
cmp = strncmp(arg1+4, arg2+4, Min(len1,len2));
if (0 == cmp)
return (int32)(len1 >= len2 ? 1 : 0);
else
return (int32)(cmp >= 0);
}
int32
bpcharcmp(char *arg1, char *arg2)
{
int len1, len2;
int cmp;
len1 = bcTruelen(arg1);
len2 = bcTruelen(arg2);
return(strncmp(arg1+4, arg2+4, Min(len1,len2)));
cmp = strncmp(arg1+4, arg2+4, Min(len1,len2));
if ((0 == cmp) && (len1 != len2))
return (int32)(len1 < len2 ? -1 : 1);
else
return cmp;
}
/*****************************************************************************
@ -369,13 +384,18 @@ int32
varcharle(char *arg1, char *arg2)
{
int len1, len2;
int cmp;
if (arg1 == NULL || arg2 == NULL)
return((int32) 0);
len1 = vcTruelen(arg1);
len2 = vcTruelen(arg2);
return(strncmp(arg1+4, arg2+4, Min(len1,len2)) <= 0);
cmp = strncmp(arg1+4, arg2+4, Min(len1,len2));
if (0 == cmp)
return (int32)( len1 <= len2 ? 1 : 0);
else
return (int32)(cmp <= 0);
}
int32
@ -400,24 +420,34 @@ int32
varcharge(char *arg1, char *arg2)
{
int len1, len2;
int cmp;
if (arg1 == NULL || arg2 == NULL)
return((int32) 0);
len1 = vcTruelen(arg1);
len2 = vcTruelen(arg2);
return(strncmp(arg1+4, arg2+4, Min(len1,len2)) >= 0);
cmp = strncmp(arg1+4, arg2+4, Min(len1,len2));
if (0 == cmp)
return (int32)(len1 >= len2 ? 1 : 0);
else
return (int32)(cmp >= 0);
}
int32
varcharcmp(char *arg1, char *arg2)
{
int len1, len2;
int cmp;
len1 = vcTruelen(arg1);
len2 = vcTruelen(arg2);
return(strncmp(arg1+4, arg2+4, Min(len1,len2)));
cmp = (strncmp(arg1+4, arg2+4, Min(len1,len2)));
if ((0 == cmp) && (len1 != len2))
return (int32)(len1 < len2 ? -1 : 1);
else
return (int32)(cmp);
}
/*****************************************************************************