lidavidm commented on code in PR #34406:
URL: https://github.com/apache/arrow/pull/34406#discussion_r1126828055
##########
cpp/src/arrow/compute/exec/options.h:
##########
@@ -614,6 +616,13 @@ class ARROW_EXPORT TableSinkNodeOptions : public
ExecNodeOptions {
///
/// \see QueryOptions for more details
std::optional<bool> sequence_output;
+ /// \brief Custom names to use for the columns.
+ ///
+ /// If specified then names must be provided for all fields. Currently, only
a flat
+ /// schema is supported (see ARROW-15901).
Review Comment:
nit: maybe we should refer to the GitHub issue instead? (I assume this was
copied from above)
##########
cpp/src/arrow/compute/exec/exec_plan.cc:
##########
@@ -925,14 +943,32 @@ struct BatchConverter {
});
}
+ Result<std::shared_ptr<Schema>> InitializeSchema(
+ const std::vector<std::string>& names) {
+ // By this point this->schema will have been set by the SinkNode. We
potentially
+ // rename it with the names provided by the user and then return this in
case the user
+ // wants to know the output schema.
+ if (!names.empty()) {
+ if (static_cast<int>(names.size()) != schema->num_fields()) {
+ return Status::Invalid(
+ "A plan was created with custom field names but the number of
names did not "
+ "match the number of output columns");
Review Comment:
nit: include expected/actual count in the message for convenience?
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