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The PRAGMA optimize command invokes ANALYZE if a table shrinks by 25 times

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in addition to if it grows by 25 times.

FossilOrigin-Name: 40532ffba91cf332c1ea4add80184031a9d6e10514d2d9b9a6cfd613091b81f7
This commit is contained in:
drh
2024-02-17 01:12:58 +00:00
parent 4dd59fd997
commit 837efb4cbe
4 changed files with 34 additions and 19 deletions
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21
src/vdbe.c
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@@ -6192,28 +6192,37 @@ case OP_Last: { /* jump, ncycle */
break;
}
/* Opcode: IfSmaller P1 P2 P3 * *
/* Opcode: IfSizeBetween P1 P2 P3 P4 *
**
** Estimate the number of rows in the table P1. Jump to P2 if that
** estimate is less than approximately 2**(0.1*P3).
** Let N be the approximate number of rows in the table or index
** with cursor P1 and let X be 10*log2(N) if N is positive or -1
** if N is zero. Thus X will be within the range of -1 to 640, inclusive
** Jump to P2 if X is in between P3 and P4, inclusive.
*/
case OP_IfSmaller: { /* jump */
case OP_IfSizeBetween: { /* jump */
VdbeCursor *pC;
BtCursor *pCrsr;
int res;
i64 sz;
assert( pOp->p1>=0 && pOp->p1<p->nCursor );
assert( pOp->p4type==P4_INT32 );
assert( pOp->p3>=-1 && pOp->p3<=640 );
assert( pOp->p4.i>=-1 && pOp->p4.i<=640 );
pC = p->apCsr[pOp->p1];
assert( pC!=0 );
pCrsr = pC->uc.pCursor;
assert( pCrsr );
rc = sqlite3BtreeFirst(pCrsr, &res);
if( rc ) goto abort_due_to_error;
if( res==0 ){
if( res!=0 ){
sz = -1; /* -Infinity encoding */
}else{
sz = sqlite3BtreeRowCountEst(pCrsr);
if( ALWAYS(sz>=0) && sqlite3LogEst((u64)sz)<pOp->p3 ) res = 1;
assert( sz>0 );
sz = sqlite3LogEst((u64)sz);
}
res = sz>=pOp->p3 && sz<=pOp->p4.i;
VdbeBranchTaken(res!=0,2);
if( res ) goto jump_to_p2;
break;