[sql] Import reference version of SQLite 3.7.6.3.

third_party/sqlite/sqlite-src-3070603/src/expr.c

Index: third_party/sqlite/sqlite-src-3070603/src/expr.c
diff --git a/third_party/sqlite/src/src/expr.c b/third_party/sqlite/sqlite-src-3070603/src/expr.c
similarity index 99%
copy from third_party/sqlite/src/src/expr.c
copy to third_party/sqlite/sqlite-src-3070603/src/expr.c
index 9d1193b35825ff7ea5b10d9e391ca425a1771840..c0e9ba6fd503da0316f0b21a33f90aad8ed84329 100644
--- a/third_party/sqlite/src/src/expr.c
+++ b/third_party/sqlite/sqlite-src-3070603/src/expr.c
@@ -578,10 +578,12 @@ void sqlite3ExprAssignVarNumber(Parse *pParse, Expr *pExpr){
     ** has never appeared before, reuse the same variable number
     */
     int i;
+    u32 n;
+    n = sqlite3Strlen30(z);
     for(i=0; i<pParse->nVarExpr; i++){
       Expr *pE = pParse->apVarExpr[i];
       assert( pE!=0 );
-      if( strcmp(pE->u.zToken, z)==0 ){
+      if( memcmp(pE->u.zToken, z, n)==0 && pE->u.zToken[n]==0 ){
         pExpr->iColumn = pE->iColumn;
         break;
       }
@@ -779,9 +781,7 @@ static Expr *exprDup(sqlite3 *db, Expr *p, int flags, u8 **pzBuffer){
       }else{
         int nSize = exprStructSize(p);
         memcpy(zAlloc, p, nSize);
-        if( EXPR_FULLSIZE>nSize ){
-          memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
-        }
+        memset(&zAlloc[nSize], 0, EXPR_FULLSIZE-nSize);
       }
 
       /* Set the EP_Reduced, EP_TokenOnly, and EP_Static flags appropriately. */