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Overview
| Comment: | Change the expression code generator to account for the fact that the new sqlite3AtoF() never returns NaN. Also, clarification of a comment in where.c. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
75f596a04a74eb3a538c7be5b41756c9 |
| User & Date: | drh 2009-08-21 13:22:25 |
Context
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2009-08-21
| ||
| 17:18 | When a database file is opened, try to find an unused file descriptor to reuse. This change affects unix (and other systems that use os_unix.c) only. Fix for cvstrac ticket #4018. (check-in: 9b4d9ab6 user: dan tags: trunk) | |
| 13:22 | Change the expression code generator to account for the fact that the new sqlite3AtoF() never returns NaN. Also, clarification of a comment in where.c. (check-in: 75f596a0 user: drh tags: trunk) | |
| 08:29 | Add assert() statements to os_unix.c to check that the mutex is held when it should be. (check-in: 11a669b6 user: dan tags: trunk) | |
Changes
Changes to src/expr.c.
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 |
** like the continuation of the number.
*/
static void codeReal(Vdbe *v, const char *z, int negateFlag, int iMem){
if( ALWAYS(z!=0) ){
double value;
char *zV;
sqlite3AtoF(z, &value);
if( sqlite3IsNaN(value) ){
sqlite3VdbeAddOp2(v, OP_Null, 0, iMem);
}else{
if( negateFlag ) value = -value;
zV = dup8bytes(v, (char*)&value);
sqlite3VdbeAddOp4(v, OP_Real, 0, iMem, 0, zV, P4_REAL);
}
}
}
/*
** Generate an instruction that will put the integer describe by
** text z[0..n-1] into register iMem.
|
| < < | | | < |
1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 |
** like the continuation of the number.
*/
static void codeReal(Vdbe *v, const char *z, int negateFlag, int iMem){
if( ALWAYS(z!=0) ){
double value;
char *zV;
sqlite3AtoF(z, &value);
assert( !sqlite3IsNaN(value) ); /* The new AtoF never returns NaN */
if( negateFlag ) value = -value;
zV = dup8bytes(v, (char*)&value);
sqlite3VdbeAddOp4(v, OP_Real, 0, iMem, 0, zV, P4_REAL);
}
}
/*
** Generate an instruction that will put the integer describe by
** text z[0..n-1] into register iMem.
|
Changes to src/where.c.
3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 |
** next nested loop. The FROM clause entries may be iterated through
** either once or twice.
**
** The first iteration, which is always performed, searches for the
** FROM clause entry that permits the lowest-cost, "optimal" scan. In
** this context an optimal scan is one that uses the same strategy
** for the given FROM clause entry as would be selected if the entry
** were used as the innermost nested loop.
**
** The second iteration is only performed if no optimal scan strategies
** were found by the first. This iteration is used to search for the
** lowest cost scan overall.
**
** Previous versions of SQLite performed only the second iteration -
** the next outermost loop was always that with the lowest overall
|
| > > |
3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 |
** next nested loop. The FROM clause entries may be iterated through
** either once or twice.
**
** The first iteration, which is always performed, searches for the
** FROM clause entry that permits the lowest-cost, "optimal" scan. In
** this context an optimal scan is one that uses the same strategy
** for the given FROM clause entry as would be selected if the entry
** were used as the innermost nested loop. In other words, a table
** is chosen such that the cost of running that table cannot be reduced
** by waiting for other tables to run first.
**
** The second iteration is only performed if no optimal scan strategies
** were found by the first. This iteration is used to search for the
** lowest cost scan overall.
**
** Previous versions of SQLite performed only the second iteration -
** the next outermost loop was always that with the lowest overall
|