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Overview
| Comment: | Add a single testcase() macro to the subquery processing logic. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
4e1df76e3d85922648e0e1cce73a266c |
| User & Date: | drh 2017-04-29 19:29:49 |
Context
|
2017-05-01
| ||
| 18:12 | Clear the BTCF_ValidNKey flag set if a cursor is moved by sqlite3BtreeInsert(). Fix for [f68dc596c4]. (check-in: a6727eef user: dan tags: trunk) | |
| 15:15 | Initial implementation of an optimization that attempts to reuse the same materialization of a view on a self-join of the view. (check-in: 478c34b9 user: drh tags: materialized-view-reuse) | |
| 14:25 | Update this branch with latest trunk changes. (check-in: 11f4761c user: dan tags: schemalint) | |
|
2017-04-29
| ||
| 19:29 | Add a single testcase() macro to the subquery processing logic. (check-in: 4e1df76e user: drh tags: trunk) | |
| 18:02 | Improvements to opcode documentation in the bytecode engine. No changes to code. (check-in: e54c9f8d user: drh tags: trunk) | |
Changes
Changes to src/select.c.
5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 |
** once, if the subquery is part of the WHERE clause in a LEFT JOIN,
** for example. In that case, do not regenerate the code to manifest
** a view or the co-routine to implement a view. The first instance
** is sufficient, though the subroutine to manifest the view does need
** to be invoked again. */
if( pItem->addrFillSub ){
if( pItem->fg.viaCoroutine==0 ){
sqlite3VdbeAddOp2(v, OP_Gosub, pItem->regReturn, pItem->addrFillSub);
}
continue;
}
/* Increment Parse.nHeight by the height of the largest expression
** tree referred to by this, the parent select. The child select
|
> > > > |
5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 |
** once, if the subquery is part of the WHERE clause in a LEFT JOIN,
** for example. In that case, do not regenerate the code to manifest
** a view or the co-routine to implement a view. The first instance
** is sufficient, though the subroutine to manifest the view does need
** to be invoked again. */
if( pItem->addrFillSub ){
if( pItem->fg.viaCoroutine==0 ){
/* The subroutine that manifests the view might be a one-time routine,
** or it might need to be rerun on each iteration because it
** encodes a correlated subquery. */
testcase( sqlite3VdbeGetOp(v, pItem->addrFillSub)->opcode==OP_Once );
sqlite3VdbeAddOp2(v, OP_Gosub, pItem->regReturn, pItem->addrFillSub);
}
continue;
}
/* Increment Parse.nHeight by the height of the largest expression
** tree referred to by this, the parent select. The child select
|