edponce commented on a change in pull request #11127:
URL: https://github.com/apache/arrow/pull/11127#discussion_r705858924
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File path: cpp/src/arrow/compute/kernels/scalar_nested.cc
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@@ -55,6 +55,23 @@ Status ListValueLength(KernelContext* ctx, const ExecBatch&
batch, Datum* out) {
return Status::OK();
}
+Status FixedSizeListValueLength(KernelContext* ctx, const ExecBatch& batch,
Datum* out) {
+ auto width = checked_cast<const
FixedSizeListType&>(*batch[0].type()).list_size();
+ if (batch[0].kind() == Datum::ARRAY) {
+ const auto& arr = *batch[0].array();
+ ArrayData* out_arr = out->mutable_array();
+ int32_t* out_values = out_arr->GetMutableValues<int32_t>(1);
+ std::fill(out_values, out_values + arr.length, width);
Review comment:
Why not use `FixedSizeListType::offset_type` instead of explicit
`int32_t`?
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