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The OP_RealAffinity opcode is not necessary after reading values from

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a virtual table (such as rtree).  It is harmless, but it does use CPU
cycles.  Might as well leave it off.

FossilOrigin-Name: dc18d89354cffcb726722c234a0271ab628a71277b22887eea2bf118028193a6
This commit is contained in:
drh 2020-05-16 18:01:02 +00:00
parent becd68ba0d
commit 8c1febb2f9
3 changed files with 13 additions and 13 deletions
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14
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@ -1,5 +1,5 @@
C Fix\sa\suse-after-free\sbug\sin\sthe\sfts3\ssnippet()\sfunction.
D 2020-05-16T17:26:58.154
C The\sOP_RealAffinity\sopcode\sis\snot\snecessary\safter\sreading\svalues\sfrom\na\svirtual\stable\s(such\sas\srtree).\s\sIt\sis\sharmless,\sbut\sit\sdoes\suse\sCPU\ncycles.\s\sMight\sas\swell\sleave\sit\soff.
D 2020-05-16T18:01:02.987
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -600,7 +600,7 @@ F src/threads.c 4ae07fa022a3dc7c5beb373cf744a85d3c5c6c3c
F src/tokenize.c eee7bae3ec0bc4abee951554bf46a8ba567c0f7752ac90c820ed8afff4c612dc
F src/treeview.c 82c6391a3ba76215d4185fd4719a56ec4caf186a40c8a7b6e6ba4ae4467c2742
F src/trigger.c 4ada1037cc99777f647a882cdacbd1a4deb6567b69daf02946286401b88cdc04
F src/update.c 3eb778c42155d944377a4ee5e440b04520f07094804ed6ce63d2528f619614d9
F src/update.c 3199098455830fc2d8c8fc4ae3ec2ea513eef64339ae9a7048db62b21169bc7a
F src/upsert.c 2920de71b20f04fe25eb00b655d086f0ba60ea133c59d7fa3325c49838818e78
F src/utf.c 95fb6e03a5ca679045c5adccd05380f0addccabef5911abddcb06af069500ab7
F src/util.c 3b6cedf7a0c69bd6e1acce832873952d416212d6293b18d03064e07d7a9b5118
@ -1866,7 +1866,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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Z f53eca45dfc23be88eb50db1df821f15

2
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@ -1 +1 @@
0d69f76f0865f9626078bee087a22fb826407279e78cf9d5382e1c985c9f64a9
dc18d89354cffcb726722c234a0271ab628a71277b22887eea2bf118028193a6

10
src/update.c
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@ -53,10 +53,10 @@ static void updateVirtualTable(
** function is capable of transforming these types of expressions into
** sqlite3_value objects.
**
** If parameter iReg is not negative, code an OP_RealAffinity instruction
** on register iReg. This is used when an equivalent integer value is
** stored in place of an 8-byte floating point value in order to save
** space.
** If column as REAL affinity and the table is an ordinary b-tree table
** (not a virtual table) then the value might have been stored as an
** integer. In that case, add an OP_RealAffinity opcode to make sure
** it has been converted into REAL.
*/
void sqlite3ColumnDefault(Vdbe *v, Table *pTab, int i, int iReg){
assert( pTab!=0 );
@ -73,7 +73,7 @@ void sqlite3ColumnDefault(Vdbe *v, Table *pTab, int i, int iReg){
}
}
#ifndef SQLITE_OMIT_FLOATING_POINT
if( pTab->aCol[i].affinity==SQLITE_AFF_REAL ){
if( pTab->aCol[i].affinity==SQLITE_AFF_REAL && !IsVirtual(pTab) ){
sqlite3VdbeAddOp1(v, OP_RealAffinity, iReg);
}
#endif