database/sqlite
1
0
Fork 0
mirror of https://github.com/sqlite/sqlite.git synced 2025-08-08 14:02:16 +03:00
Code Activity

Allow only a single recursive reference in a recursive CTE. Also require that this reference is not part of a sub-query.

Browse Source 
FossilOrigin-Name: a296b73360d34c9364eceb2cc09a9a92adc4abb8
This commit is contained in:
dan
2014-01-16 18:34:33 +00:00
parent 8290c2ad5a
commit eae73fbfb9
7 changed files with 62 additions and 85 deletions
Download Patch File Download Diff File Expand all files Collapse all files

23
src/vdbe.c
View File

@@ -3370,29 +3370,6 @@ case OP_OpenEphemeral: {
}
#ifndef SQLITE_OMIT_CTE
/* Opcode: OpenEphreader P1 P2 * * *
**
** P2 is a cursor opened by the OpenEphemeral opcode. This opcode opens
** a new read-only cursor named P1 that accesses the same epheremal table
** as P2.
*/
case OP_OpenEphreader: {
VdbeCursor *pEph;
VdbeCursor *pCx;
Pgno pgno;
pEph = p->apCsr[pOp->p2];
pCx = allocateCursor(p, pOp->p1, pEph->nField, -1, 1);
if( pCx==0 ) goto no_mem;
pCx->nullRow = 1;
pCx->pKeyInfo = pEph->pKeyInfo;
pCx->isTable = pEph->isTable;
pCx->isOrdered = pEph->isOrdered;
pgno = MASTER_ROOT + !pCx->isTable;
rc = sqlite3BtreeCursor(pEph->pBt, pgno, 0, pCx->pKeyInfo, pCx->pCursor);
break;
}
/* Opcode: SwapCursors P1 P2 * * *
**
** Parameters P1 and P2 are both cursors opened by the OpenEphemeral