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The XFER optimization works if the target table lacks an integer primary

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key and is not empty as long as it has no indices.  It always has and
continues to work if the target table was empty. (CVS 3779)

FossilOrigin-Name: 2c62ffcb865655e8b91aaf81601548ea540c6088
This commit is contained in:
drh 2007-03-31 13:00:26 +00:00
parent 393f068912
commit bd36ba69b0
3 changed files with 18 additions and 14 deletions
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14
manifest
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@ -1,5 +1,5 @@
C More\scoverage\sfor\spager.c.\s(CVS\s3778)
D 2007-03-31T10:00:48
C The\sXFER\soptimization\sworks\sif\sthe\starget\stable\slacks\san\sinteger\sprimary\nkey\sand\sis\snot\sempty\sas\slong\sas\sit\shas\sno\sindices.\s\sIt\salways\shas\sand\ncontinues\sto\swork\sif\sthe\starget\stable\swas\sempty.\s(CVS\s3779)
D 2007-03-31T13:00:26
F Makefile.in 2f2c3bf69faf0ae7b8e8af4f94f1986849034530
F Makefile.linux-gcc 2d8574d1ba75f129aba2019f0b959db380a90935
F README 9c4e2d6706bdcc3efdd773ce752a8cdab4f90028
@ -70,7 +70,7 @@ F src/expr.c a8740c24af3f39f2d502be1a1c640c96435eaac0
F src/func.c 94372fe3cf26b81d4dcdc15f98ff240c37c8c708
F src/hash.c 67b23e14f0257b69a3e8aa663e4eeadc1a2b6fd5
F src/hash.h 1b3f7e2609141fd571f62199fc38687d262e9564
F src/insert.c aa61e77807becb8b6c3ffcf53be98d20b0e6f107
F src/insert.c 664e4ccabc6393dc3be08ce2c47ccfea4b049e15
F src/legacy.c 2631df6a861f830d6b1c0fe92b9fdd745b2c0cd6
F src/loadext.c 146fb9b9dc6133e763888d710205c32ebf8eeca2
F src/main.c a02581f5076a49f18f67b00fdc4c7ae338adc679
@ -447,7 +447,7 @@ F www/tclsqlite.tcl bb0d1357328a42b1993d78573e587c6dcbc964b9
F www/vdbe.tcl 87a31ace769f20d3627a64fa1fade7fed47b90d0
F www/version3.tcl 890248cf7b70e60c383b0e84d77d5132b3ead42b
F www/whentouse.tcl 97e2b5cd296f7d8057e11f44427dea8a4c2db513
P 2aae1964572f4d4d1eae090a997e0bd9a82a69b2
R b247f1fbf3d4ee87e5ed24496e82da0b
U danielk1977
Z d6a6a23d64b55f3f47e9a0fdb32d08db
P 665b119a241a5a95f236b3ace1b25fc18ae6f0a3
R 9f121d7e35408502111509abe72bb20f
U drh
Z b33e1fa0faf5f5d21de224dfc99146bc

2
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@ -1 +1 @@
665b119a241a5a95f236b3ace1b25fc18ae6f0a3
2c62ffcb865655e8b91aaf81601548ea540c6088

16
src/insert.c
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@ -12,7 +12,7 @@
** This file contains C code routines that are called by the parser
** to handle INSERT statements in SQLite.
**
** $Id: insert.c,v 1.181 2007/03/29 13:35:36 drh Exp $
** $Id: insert.c,v 1.182 2007/03/31 13:00:26 drh Exp $
*/
#include "sqliteInt.h"
@ -1504,10 +1504,11 @@ static int xferOptimization(
iDest = pParse->nTab++;
counterMem = autoIncBegin(pParse, iDbDest, pDest);
sqlite3OpenTable(pParse, iDest, iDbDest, pDest, OP_OpenWrite);
if( pDest->iPKey<0 ){
/* The tables do not have an INTEGER PRIMARY KEY so that
** transfer optimization is only allowed if the destination
** table is initially empty
if( pDest->iPKey<0 && pDest->pIndex!=0 ){
/* If tables do not have an INTEGER PRIMARY KEY and there
** are indices to be copied and the destination is not empty,
** we have to disallow the transfer optimization because the
** the rowids might change which will mess up indexing.
*/
addr1 = sqlite3VdbeAddOp(v, OP_Rewind, iDest, 0);
emptyDestTest = sqlite3VdbeAddOp(v, OP_Goto, 0, 0);
@ -1522,15 +1523,18 @@ static int xferOptimization(
memRowid = pParse->nMem++;
sqlite3VdbeAddOp(v, OP_MemStore, memRowid, pDest->iPKey>=0);
}
addr1 = sqlite3VdbeAddOp(v, OP_Rowid, iSrc, 0);
if( pDest->iPKey>=0 ){
addr1 = sqlite3VdbeAddOp(v, OP_Rowid, iSrc, 0);
sqlite3VdbeAddOp(v, OP_Dup, 0, 0);
addr2 = sqlite3VdbeAddOp(v, OP_NotExists, iDest, 0);
sqlite3VdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, onError,
"PRIMARY KEY must be unique", P3_STATIC);
sqlite3VdbeJumpHere(v, addr2);
autoIncStep(pParse, counterMem);
}else if( pDest->pIndex==0 ){
addr1 = sqlite3VdbeAddOp(v, OP_NewRowid, iDest, 0);
}else{
addr1 = sqlite3VdbeAddOp(v, OP_Rowid, iSrc, 0);
assert( pDest->autoInc==0 );
}
sqlite3VdbeAddOp(v, OP_RowData, iSrc, 0);