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Create a new pager type, PAGER_SORTER, for use in the external merge sort.

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Such pagers are always held in memory but do report when they are under
memory pressure by calling pagerStress.

FossilOrigin-Name: c71d73201d950355862dd8d5de142c9673888755
This commit is contained in:
drh
2011-08-26 00:34:45 +00:00
parent c5dbffe741
commit 2a5d9908f9
9 changed files with 76 additions and 19 deletions
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8
src/vdbe.c
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@@ -3131,7 +3131,7 @@ case OP_OpenWrite: {
break;
}
/* Opcode: OpenEphemeral P1 P2 * P4 *
/* Opcode: OpenEphemeral P1 P2 * P4 P5
**
** Open a new cursor P1 to a transient table.
** The cursor is always opened read/write even if
@@ -3148,6 +3148,11 @@ case OP_OpenWrite: {
** to a TEMP table at the SQL level, or to a table opened by
** this opcode. Then this opcode was call OpenVirtual. But
** that created confusion with the whole virtual-table idea.
**
** The P5 parameter can be a mask of the BTREE_* flags defined
** in btree.h. These flags control aspects of the operation of
** the btree. The BTREE_OMIT_JOURNAL and BTREE_SINGLE flags are
** added automatically.
*/
/* Opcode: OpenAutoindex P1 P2 * P4 *
**
@@ -3174,6 +3179,7 @@ case OP_OpenEphemeral: {
SQLITE_OPEN_TRANSIENT_DB;
assert( pOp->p1>=0 );
assert( (pOp->opcode==OP_OpenSorter)==((pOp->p5 & BTREE_SORTER)!=0) );
pCx = allocateCursor(p, pOp->p1, pOp->p2, -1, 1);
if( pCx==0 ) goto no_mem;
pCx->nullRow = 1;