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Overview
| Comment: | Simplification to the like optimization logic. Remove unnecessary branches. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
9466d952e169a6a60f6e575e679a61f0 |
| User & Date: | drh 2017-08-11 03:47:21 |
Context
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2017-08-11
| ||
| 12:49 | Convert the LSM1 virtual table to be WITHOUT ROWID and get UPDATE and DELETE operations working on it. (check-in: 2164031b user: drh tags: trunk) | |
| 03:47 | Simplification to the like optimization logic. Remove unnecessary branches. (check-in: 9466d952 user: drh tags: trunk) | |
|
2017-08-10
| ||
| 20:43 | Allow WITHOUT ROWID virtual tables to be writable as long as they have exactly one column as their PRIMARY KEY. (check-in: c601d128 user: drh tags: trunk) | |
Changes
Changes to src/whereexpr.c.
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}
}
/* Count the number of prefix characters prior to the first wildcard */
cnt = 0;
while( (c=z[cnt])!=0 && c!=wc[0] && c!=wc[1] && c!=wc[2] ){
cnt++;
if( c==wc[3] && z[cnt]!=0 ){
if( z[cnt++]>0xc0 ) while( (z[cnt]&0xc0)==0x80 ){ cnt++; }
}
}
/* The optimization is possible only if (1) the pattern does not begin
** with a wildcard and if (2) the non-wildcard prefix does not end with
** an (illegal 0xff) character. The second condition is necessary so
** that we can increment the prefix key to find an upper bound for the
** range search.
|
| < < |
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}
}
/* Count the number of prefix characters prior to the first wildcard */
cnt = 0;
while( (c=z[cnt])!=0 && c!=wc[0] && c!=wc[1] && c!=wc[2] ){
cnt++;
if( c==wc[3] && z[cnt]!=0 ) cnt++;
}
/* The optimization is possible only if (1) the pattern does not begin
** with a wildcard and if (2) the non-wildcard prefix does not end with
** an (illegal 0xff) character. The second condition is necessary so
** that we can increment the prefix key to find an upper bound for the
** range search.
|