Slight performance improvement in the OP_Column opcode.

FossilOrigin-Name: 5c157474391f90f24e8867c77fbc6564c7955ecc

diff --git a/manifest b/manifest
index 264470f9abb01ec41441272df55b1a4a61de4efb..9f9a5c97adacbe1344fd2e08d6ff18d6b8e0c4b7 100644 (file)
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Remove\sthe\ssqlite3PagerClearCache()\sroutine,\swhich\sdoes\snot\saccomplish\sanything\nuseful.
-D 2016-05-20T18:09:01.269
+C Slight\sperformance\simprovement\sin\sthe\sOP_Column\sopcode.
+D 2016-05-20T19:51:28.931
 F Makefile.in f59e0763ff448719fc1bd25513882b0567286317
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 306d73e854b1a92ea06e5d1e637faa5c44de53c7
@@ -444,7 +444,7 @@ F src/update.c 4f05ea8cddfa367d045e03589756c02199e8f9bd
 F src/utf.c 699001c79f28e48e9bcdf8a463da029ea660540c
 F src/util.c 810ec3f22e2d1b62e66c30fe3621ebdedd23584d
 F src/vacuum.c feb1eabb20987983d9350cad98299b21fa811f52
-F src/vdbe.c d71b935d2b21bef874680c34329adedc3b021101
+F src/vdbe.c 9d0872c73555b335d7e658bb9b6fd69798ba551c
 F src/vdbe.h 5591b5add447096e31288b5a0a78ec5d7b5c5170
 F src/vdbeInt.h ddb157974436d87652de7dc641f7191496d9a8cd
 F src/vdbeapi.c ba85b78fe08dc4a9ce747e62c89a2b4a4547e74c
@@ -1490,7 +1490,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 4dc56e8684e0c74fb311c7f0ef1c367da8c7bf70
-R f1ca77b965b4fac61acdc31594820a52
+P f250166bb3c1b0c58e703b334825cf6210758fda
+R 67f498d524675be2828322b33e8cc61d
 U drh
-Z c5c16d4ca102bc8075809f03a41e82f3
+Z 6bf519f6e91709086e486df141738a73

diff --git a/manifest.uuid b/manifest.uuid
index e1934ce2a22226f34f4595693f790e3faa58612d..5befa4101614cffa2bd28d786e73c7c5391a241e 100644 (file)
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-f250166bb3c1b0c58e703b334825cf6210758fda
\ No newline at end of file
+5c157474391f90f24e8867c77fbc6564c7955ecc
\ No newline at end of file

diff --git a/src/vdbe.c b/src/vdbe.c
index 6d96f85548e3a35e5920e43de2158fcdd2cac66a..9f36a3feb2a4d953289c13ed269f05e5d8ad9f88 100644 (file)
--- a/src/vdbe.c
+++ b/src/vdbe.c
@@ -2575,9 +2575,10 @@ case OP_Column: {
   assert( p2<pC->nHdrParsed );
   assert( rc==SQLITE_OK );
   assert( sqlite3VdbeCheckMemInvariants(pDest) );
-  if( VdbeMemDynamic(pDest) ) sqlite3VdbeMemSetNull(pDest);
+  if( VdbeMemDynamic(pDest) ){
+    sqlite3VdbeMemSetNull(pDest);
+  }
   assert( t==pC->aType[p2] );
-  pDest->enc = encoding;
   if( pC->szRow>=aOffset[p2+1] ){
     /* This is the common case where the desired content fits on the original
     ** page - where the content is not on an overflow page */
@@ -2591,6 +2592,7 @@ case OP_Column: {
       */
       static const u16 aFlag[] = { MEM_Blob, MEM_Str|MEM_Term };
       pDest->n = len = (t-12)/2;
+      pDest->enc = encoding;
       if( pDest->szMalloc < len+2 ){
         pDest->flags = MEM_Null;
         if( sqlite3VdbeMemGrow(pDest, len+2, 0) ) goto no_mem;
@@ -2603,6 +2605,7 @@ case OP_Column: {
       pDest->flags = aFlag[t&1];
     }
   }else{
+    pDest->enc = encoding;
     /* This branch happens only when content is on overflow pages */
     if( ((pOp->p5 & (OPFLAG_LENGTHARG|OPFLAG_TYPEOFARG))!=0
           && ((t>=12 && (t&1)==0) || (pOp->p5 & OPFLAG_TYPEOFARG)!=0))