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It is not necessary to de-ephermeralize the output registers in the

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OP_ResultRow opcode.  Omit that step for a size reduction and performance
increase.

FossilOrigin-Name: 8a07745aed1d0a4eead55d43f1923597b12371f307ecf5bc19c5a1db9a107a50
This commit is contained in:
drh 2022-04-01 20:19:36 +00:00
parent 35e9e350ca
commit 3b8b5be3b7
3 changed files with 22 additions and 35 deletions
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@ -1,5 +1,5 @@
C There\sis\sno\sneed\sfor\ssqlite3_step()\sto\scheck\sfor\san\sOOM\scondition\sprior\nto\sstarting\sup.
D 2022-04-01T19:13:39.542
C It\sis\snot\snecessary\sto\sde-ephermeralize\sthe\soutput\sregisters\sin\sthe\nOP_ResultRow\sopcode.\s\sOmit\sthat\sstep\sfor\sa\ssize\sreduction\sand\sperformance\nincrease.
D 2022-04-01T20:19:36.366
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F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -624,7 +624,7 @@ F src/upsert.c 8789047a8f0a601ea42fa0256d1ba3190c13746b6ba940fe2d25643a7e991937
F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
F src/util.c 602fe229f32a96ceccae4f40824129669582096f7c355f53dbac156c9fecef23
F src/vacuum.c 6c38ddc52f0619865c91dae9c441d4d48bf3040d7dc1bc5b22da1e45547ed0b3
F src/vdbe.c 8f8373466beab434b7d1991fafec68a13318adf10ccf345a14ed178873c66632
F src/vdbe.c c8f0fc516a54aa9c696ca0cd4f54b550ea86ab08bcee70b8982f5e3b0305ab8b
F src/vdbe.h a1d0e3b934e835e73edd146f2e7c4eadb711b5c9875c18159a57483fd78e550e
F src/vdbeInt.h 22babf1e585ae7e5c49f2e6442969b88f07bdcc3d154164346d25ef4efa3ebf3
F src/vdbeapi.c 5c498998c99667f16cac2519f2fa439fe46acf99a332b0caa73637fc2ab35c22
@ -1945,8 +1945,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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# Remove this line to create a well-formed Fossil manifest.

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@ -1 +1 @@
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8a07745aed1d0a4eead55d43f1923597b12371f307ecf5bc19c5a1db9a107a50

43
src/vdbe.c
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@ -1549,45 +1549,32 @@ case OP_FkCheck: {
** the result row.
*/
case OP_ResultRow: {
Mem *pMem;
int i;
assert( p->nResColumn==pOp->p2 );
assert( pOp->p1>0 || CORRUPT_DB );
assert( pOp->p1+pOp->p2<=(p->nMem+1 - p->nCursor)+1 );
/* Invalidate all ephemeral cursor row caches */
p->cacheCtr = (p->cacheCtr + 2)|1;
/* Make sure the results of the current row are \000 terminated
** and have an assigned type. The results are de-ephemeralized as
** a side effect.
*/
pMem = p->pResultSet = &aMem[pOp->p1];
for(i=0; i<pOp->p2; i++){
assert( memIsValid(&pMem[i]) );
Deephemeralize(&pMem[i]);
assert( (pMem[i].flags & MEM_Ephem)==0
|| (pMem[i].flags & (MEM_Str|MEM_Blob))==0 );
sqlite3VdbeMemNulTerminate(&pMem[i]);
REGISTER_TRACE(pOp->p1+i, &pMem[i]);
p->pResultSet = &aMem[pOp->p1];
#ifdef SQLITE_DEBUG
/* The registers in the result will not be used again when the
** prepared statement restarts. This is because sqlite3_column()
** APIs might have caused type conversions of made other changes to
** the register values. Therefore, we can go ahead and break any
** OP_SCopy dependencies. */
pMem[i].pScopyFrom = 0;
#endif
{
Mem *pMem = p->pResultSet;
int i;
for(i=0; i<pOp->p2; i++){
assert( memIsValid(&pMem[i]) );
REGISTER_TRACE(pOp->p1+i, &pMem[i]);
/* The registers in the result will not be used again when the
** prepared statement restarts. This is because sqlite3_column()
** APIs might have caused type conversions of made other changes to
** the register values. Therefore, we can go ahead and break any
** OP_SCopy dependencies. */
pMem[i].pScopyFrom = 0;
}
}
#endif
if( db->mallocFailed ) goto no_mem;
if( db->mTrace & SQLITE_TRACE_ROW ){
db->trace.xV2(SQLITE_TRACE_ROW, db->pTraceArg, p, 0);
}
/* Return SQLITE_ROW
*/
p->pc = (int)(pOp - aOp) + 1;
rc = SQLITE_ROW;
goto vdbe_return;