database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-10 01:02:56 +03:00
Code Activity

Experimental code that tries to put the computation of subqueries inside a

Browse Source 
subroutine, and reuse that subroutine if the same subquery is evaluated more
than once.  Current code does not work for CHECK constraints.

FossilOrigin-Name: 6c44838adbe5dc482bc010e91a6dd7a0f777c989f443dd600740d2c783208e0d
This commit is contained in:
drh
2018-12-24 02:34:49 +00:00
parent 85bcdce270
commit 2c04131ca7
7 changed files with 121 additions and 56 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
src/vdbe.c
View File

@@ -3610,7 +3610,8 @@ case OP_OpenDup: {
pCx->isEphemeral = 1;
pCx->pKeyInfo = pOrig->pKeyInfo;
pCx->isTable = pOrig->isTable;
rc = sqlite3BtreeCursor(pOrig->pBtx, MASTER_ROOT, BTREE_WRCSR,
pCx->pgnoRoot = pOrig->pgnoRoot;
rc = sqlite3BtreeCursor(pOrig->pBtx, pCx->pgnoRoot, BTREE_WRCSR,
pCx->pKeyInfo, pCx->uc.pCursor);
/* The sqlite3BtreeCursor() routine can only fail for the first cursor
** opened for a database. Since there is already an open cursor when this
@@ -3682,6 +3683,7 @@ case OP_OpenEphemeral: {
assert( pgno==MASTER_ROOT+1 );
assert( pKeyInfo->db==db );
assert( pKeyInfo->enc==ENC(db) );
pCx->pgnoRoot = pgno;
rc = sqlite3BtreeCursor(pCx->pBtx, pgno, BTREE_WRCSR,
pKeyInfo, pCx->uc.pCursor);
}
@@ -3690,6 +3692,7 @@ case OP_OpenEphemeral: {
rc = sqlite3BtreeCursor(pCx->pBtx, MASTER_ROOT, BTREE_WRCSR,
0, pCx->uc.pCursor);
pCx->isTable = 1;
pCx->pgnoRoot = MASTER_ROOT;
}
}
if( rc ) goto abort_due_to_error;