message: [explore] fix IN filter on numeric field
diff: @@ -477,6 +477,7 @@ class SqlaTable(Model, BaseDatasource):
  if op == 'not in':
  cond = ~cond
  where_clause_and.append(cond)
  + else:
  if col_obj.is_num:
  eq = utils.string_to_num(flt['val'])
  if op == '==':
  