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Overview
| Comment: | Fix a bug in the spellfix extension causing it to compute suboptimal answers. The problem was introduced by check-in [afd6fbc01052ccfc9]. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
3bf28fd9a70ebefc464dceda124d6ed3 |
| User & Date: | drh 2018-03-30 16:34:04 |
Context
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2018-03-31
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| 16:31 | Fix an assertion failure triggered by a SELECT with a compound sub-query that contains an incorrectly placed ORDER BY clause. This problem is just an assert() failure - non-DEBUG builds are not affected. Problem found by OSSFuzz. (check-in: 823779d3 user: dan tags: trunk) | |
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2018-03-30
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| 16:34 | Fix a bug in the spellfix extension causing it to compute suboptimal answers. The problem was introduced by check-in [afd6fbc01052ccfc9]. (check-in: 3bf28fd9 user: drh tags: trunk) | |
| 15:59 | Fix an off-by-one error in the dist3 algorithm of the spellfix extension. (check-in: 5c34af7b user: drh tags: trunk) | |
Changes
Changes to ext/misc/spellfix.c.
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}
/*
** Return TRUE (non-zero) if the To side of the given cost matches
** the given string.
*/
static int matchTo(EditDist3Cost *p, const char *z, int n){
if( p->a[p->nFrom]!=z[0] ) return 0;
if( p->nTo>n ) return 0;
if( strncmp(p->a+p->nFrom, z, p->nTo)!=0 ) return 0;
return 1;
}
/*
** Return TRUE (non-zero) if the From side of the given cost matches
** the given string.
*/
static int matchFrom(EditDist3Cost *p, const char *z, int n){
assert( p->nFrom<=n );
if( p->a[0]!=z[0] ) return 0;
if( strncmp(p->a, z, p->nFrom)!=0 ) return 0;
return 1;
}
/*
** Return TRUE (non-zero) of the next FROM character and the next TO
** character are the same.
*/
................................................................................
EditDist3FromString *pStr, /* Left hand string */
int n1, /* Index of comparison character on the left */
const char *z2, /* Right-handl comparison character */
int n2 /* Bytes remaining in z2[] */
){
int b1 = pStr->a[n1].nByte;
if( b1>n2 ) return 0;
if( pStr->z[n1]!=z2[0] ) return 0;
if( strncmp(pStr->z+n1, z2, b1)!=0 ) return 0;
return 1;
}
/*
** Delete an EditDist3FromString objecct
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}
/*
** Return TRUE (non-zero) if the To side of the given cost matches
** the given string.
*/
static int matchTo(EditDist3Cost *p, const char *z, int n){
assert( n>0 );
if( p->a[p->nFrom]!=z[0] ) return 0;
if( p->nTo>n ) return 0;
if( strncmp(p->a+p->nFrom, z, p->nTo)!=0 ) return 0;
return 1;
}
/*
** Return TRUE (non-zero) if the From side of the given cost matches
** the given string.
*/
static int matchFrom(EditDist3Cost *p, const char *z, int n){
assert( p->nFrom<=n );
if( p->nFrom ){
if( p->a[0]!=z[0] ) return 0;
if( strncmp(p->a, z, p->nFrom)!=0 ) return 0;
}
return 1;
}
/*
** Return TRUE (non-zero) of the next FROM character and the next TO
** character are the same.
*/
................................................................................
EditDist3FromString *pStr, /* Left hand string */
int n1, /* Index of comparison character on the left */
const char *z2, /* Right-handl comparison character */
int n2 /* Bytes remaining in z2[] */
){
int b1 = pStr->a[n1].nByte;
if( b1>n2 ) return 0;
assert( b1>0 );
if( pStr->z[n1]!=z2[0] ) return 0;
if( strncmp(pStr->z+n1, z2, b1)!=0 ) return 0;
return 1;
}
/*
** Delete an EditDist3FromString objecct
|