message: Added function octet_length to get the length of a BLOB type.
diff: @@ -50,6 +50,9 @@ void LengthFun::RegisterFunction(BuiltinFunctions &set) {
  ScalarFunction::UnaryFunction<string_t, int64_t, StrLenOperator, true>));
  set.AddFunction(ScalarFunction("bit_length", {SQLType::VARCHAR}, SQLType::BIGINT,
  ScalarFunction::UnaryFunction<string_t, int64_t, BitLenOperator, true>));
  + // length for BLOB type
  + set.AddFunction(ScalarFunction("octet_length", {SQLType::VARCHAR}, SQLType::BIGINT,
  + ScalarFunction::UnaryFunction<string_t, int64_t, StrLenOperator, true>));
  }
  struct UnicodeOperator {
  