Avoid duplicate b-tree searches in the duplicate row detector used to

implement DISTINCT.

FossilOrigin-Name: d577dda0a7fbfacda57e8cad2bc4651d2a05d813

src/select.c

@@ -657,6 +657,7 @@ static void codeDistinct(
   sqlite3VdbeAddOp4Int(v, OP_Found, iTab, addrRepeat, iMem, N); VdbeCoverage(v);
   sqlite3VdbeAddOp3(v, OP_MakeRecord, iMem, N, r1);
   sqlite3VdbeAddOp4Int(v, OP_IdxInsert, iTab, r1, iMem, N);
+  sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
   sqlite3ReleaseTempReg(pParse, r1);
 }