message: Changed octet_length to support just BLOB types.
diff: @@ -38,7 +38,7 @@ void LengthFun::RegisterFunction(BuiltinFunctions &set) {
  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,
  + set.AddFunction(ScalarFunction("octet_length", {SQLType::BLOB}, SQLType::BIGINT,
  ScalarFunction::UnaryFunction<string_t, int64_t, StrLenOperator, true>));
  }
  