Code optimization for UrowID

Author: sharadraju

lib/types.js

@@ -256,7 +256,7 @@ const DB_TYPE_CONVERSION_MAP = new Map([
     [DB_TYPE_VARCHAR, DB_TYPE_VARCHAR]
   ])],
   [DB_TYPE_ROWID, new Map([
-    [DB_TYPE_VARCHAR, DB_TYPE_VARCHAR]
+    [DB_TYPE_VARCHAR, DB_TYPE_ROWID]
   ])],
   [DB_TYPE_TIMESTAMP, new Map([
     [DB_TYPE_VARCHAR, DB_TYPE_VARCHAR],
@@ -271,7 +271,7 @@ const DB_TYPE_CONVERSION_MAP = new Map([
     [DB_TYPE_TIMESTAMP_LTZ, DB_TYPE_TIMESTAMP_LTZ]
   ])],
   [DB_TYPE_UROWID, new Map([
-    [DB_TYPE_VARCHAR, DB_TYPE_VARCHAR]
+    [DB_TYPE_VARCHAR, DB_TYPE_ROWID]
   ])],
 ]);