lionel- commented on a change in pull request #7514:
URL: https://github.com/apache/arrow/pull/7514#discussion_r444292367
##########
File path: r/src/array_from_vector.cpp
##########
@@ -1067,12 +1110,22 @@ std::shared_ptr<arrow::DataType>
InferArrowTypeFromVector<VECSXP>(SEXP x) {
if (Rf_inherits(x, "data.frame")) {
return InferArrowTypeFromDataFrame(x);
} else {
- if (XLENGTH(x) == 0) {
- Rcpp::stop(
- "Requires at least one element to infer the values' type of a list
vector");
- }
+ SEXP ptype = Rf_getAttrib(x, symbols::ptype);
+ if (ptype == R_NilValue) {
Review comment:
Yes in vctrs and rlang we generally use pointer comparison with
singletons (NULL, symbols, cached objects). I guess it's best to use the local
style though?
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
[email protected]
