nirandaperera commented on a change in pull request #10802:
URL: https://github.com/apache/arrow/pull/10802#discussion_r684367917
##########
File path: cpp/src/arrow/compute/kernels/vector_selection.cc
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@@ -2146,6 +2147,203 @@ class TakeMetaFunction : public MetaFunction {
}
};
+// ----------------------------------------------------------------------
+// DropNull Implementation
+
+Status GetDropNullFilter(const Array& values, MemoryPool* memory_pool,
+ std::shared_ptr<arrow::BooleanArray>* out_array) {
+ auto bitmap_buffer = values.null_bitmap();
+ *out_array = std::make_shared<BooleanArray>(values.length(), bitmap_buffer,
nullptr, 0,
+ values.offset());
+ return Status::OK();
+}
+
+Status CreateEmptyArray(std::shared_ptr<DataType> type, MemoryPool*
memory_pool,
+ std::shared_ptr<Array>* output_array) {
+ std::unique_ptr<ArrayBuilder> builder;
+ RETURN_NOT_OK(MakeBuilder(memory_pool, type, &builder));
+ RETURN_NOT_OK(builder->Resize(0));
+ ARROW_ASSIGN_OR_RAISE(*output_array, builder->Finish());
+ return Status::OK();
+}
Review comment:
Yep! We just had this discussion in Zulip.
https://ursalabs.zulipchat.com/#narrow/stream/271283-help.2Fc.2B.2B/topic/creating.20empty.20array.2F.20table.20using.20Slice
https://issues.apache.org/jira/browse/ARROW-7051
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