Remove an unnecessary sqlite3_bind_int64() call from sqlite3_blob_open().

Also other minor refactoring of the sqlite3_blob implementation.

FossilOrigin-Name: 9d197a532349f4b1caf66bbed70ca46df86cb86f

manifest

@@ -1,5 +1,5 @@
-C Minor\sperformance\soptimization\sand\ssize\sreduction\sto\sthe\saccessPayload()\nroutine\sin\sbtree.c.
+C Remove\san\sunnecessary\ssqlite3_bind_int64()\scall\sfrom\ssqlite3_blob_open().\nAlso\sother\sminor\srefactoring\sof\sthe\ssqlite3_blob\simplementation.
-D 2017-01-20T20:43:14.971
+D 2017-01-21T14:11:28.343
 F Makefile.in 41bd4cad981487345c4a84081074bcdb876e4b2e
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc b8ca53350ae545e3562403d5da2a69cec79308da
@@ -462,7 +462,7 @@ F src/vdbe.h b0866e4191f096f1c987a84b042c3599bdf5423b
 F src/vdbeInt.h 281cb70332dc8b593b8c7afe776f3a2ba7d4255e
 F src/vdbeapi.c d6ebaa465f070eb1af8ba4e7b34583ece87bdd24
 F src/vdbeaux.c 35c9a9908174e5a26c96d15e1f98214814a39147
-F src/vdbeblob.c fe3694fcc3cf2cad395416f5289bd0e935c2659d
+F src/vdbeblob.c 824f360105b8cd43c2ec8c4611fd3b162a3a3eed
 F src/vdbemem.c 3b5a9a5b375458d3e12a50ae1aaa41eeec2175fd
 F src/vdbesort.c eda25cb2d1727efca6f7862fea32b8aa33c0face
 F src/vdbetrace.c 41963d5376f0349842b5fc4aaaaacd7d9cdc0834
@@ -1547,7 +1547,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 8971d98f25a4f5fb060db8ed6a4b06f083122a50
+P 264e5c10d7144910b3223b64546567fa20e4bc65
-R 6803846831f043d39b9c85f99ff10309
+R 8ac11845f3680b4a63ed584c4ec0c997
 U drh
-Z 62cd4db9c45f8ac36491823fd1143808
+Z e8ceb26091bad5772496cc1502eaca7e

manifest.uuid

@@ -1 +1 @@
-264e5c10d7144910b3223b64546567fa20e4bc65
+9d197a532349f4b1caf66bbed70ca46df86cb86f

src/vdbeblob.c

@@ -23,10 +23,10 @@
 */
 typedef struct Incrblob Incrblob;
 struct Incrblob {
-  int flags;              /* Copy of "flags" passed to sqlite3_blob_open() */
   int nByte;              /* Size of open blob, in bytes */
   int iOffset;            /* Byte offset of blob in cursor data */
-  int iCol;               /* Table column this handle is open on */
+  u16 iCol;               /* Table column this handle is open on */
+  u8 isPureKV;            /* True if pTab is a pure key/value table */
   BtCursor *pCsr;         /* Cursor pointing at blob row */
   sqlite3_stmt *pStmt;    /* Statement holding cursor open */
   sqlite3 *db;            /* The associated database */
@@ -117,7 +117,7 @@ int sqlite3_blob_open(
   const char *zTable,     /* The table containing the blob */
   const char *zColumn,    /* The column containing the blob */
   sqlite_int64 iRow,      /* The row containing the glob */
-  int flags,              /* True -> read/write access, false -> read-only */
+  int wrFlag,             /* True -> read/write access, false -> read-only */
   sqlite3_blob **ppBlob   /* Handle for accessing the blob returned here */
 ){
   int nAttempt = 0;
@@ -139,7 +139,7 @@ int sqlite3_blob_open(
     return SQLITE_MISUSE_BKPT;
   }
 #endif
-  flags = !!flags;                /* flags = (flags ? 1 : 0); */
+  wrFlag = !!wrFlag;                /* wrFlag = (wrFlag ? 1 : 0); */
 
   sqlite3_mutex_enter(db->mutex);
 
@@ -199,9 +199,8 @@ int sqlite3_blob_open(
 
     /* If the value is being opened for writing, check that the
     ** column is not indexed, and that it is not part of a foreign key. 
-    ** It is against the rules to open a column to which either of these
+    */
-    ** descriptions applies for writing.  */
+    if( wrFlag ){
-    if( flags ){
       const char *zFault = 0;
       Index *pIdx;
 #ifndef SQLITE_OMIT_FOREIGN_KEY
@@ -272,7 +271,7 @@ int sqlite3_blob_open(
       int iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
       VdbeOp *aOp;
 
-      sqlite3VdbeAddOp4Int(v, OP_Transaction, iDb, flags, 
+      sqlite3VdbeAddOp4Int(v, OP_Transaction, iDb, wrFlag, 
                            pTab->pSchema->schema_cookie,
                            pTab->pSchema->iGeneration);
       sqlite3VdbeChangeP5(v, 1);     
@@ -289,7 +288,7 @@ int sqlite3_blob_open(
 #else
         aOp[0].p1 = iDb;
         aOp[0].p2 = pTab->tnum;
-        aOp[0].p3 = flags;
+        aOp[0].p3 = wrFlag;
         sqlite3VdbeChangeP4(v, 1, pTab->zName, P4_TRANSIENT);
       }
       if( db->mallocFailed==0 ){
@@ -297,7 +296,7 @@ int sqlite3_blob_open(
 
         /* Remove either the OP_OpenWrite or OpenRead. Set the P2 
         ** parameter of the other to pTab->tnum.  */
-        if( flags ) aOp[1].opcode = OP_OpenWrite;
+        if( wrFlag ) aOp[1].opcode = OP_OpenWrite;
         aOp[1].p2 = pTab->tnum;
         aOp[1].p3 = iDb;   
 
@@ -319,14 +318,13 @@ int sqlite3_blob_open(
       }
     }
    
-    pBlob->flags = flags;
+    pBlob->isPureKV = (pTab->nCol==2 && pTab->iPKey==0);
     pBlob->iCol = iCol;
     pBlob->db = db;
     sqlite3BtreeLeaveAll(db);
     if( db->mallocFailed ){
       goto blob_open_out;
     }
-    sqlite3_bind_int64(pBlob->pStmt, 1, iRow);
     rc = blobSeekToRow(pBlob, iRow, &zErr);
   } while( (++nAttempt)<SQLITE_MAX_SCHEMA_RETRY && rc==SQLITE_SCHEMA );