Executing compute functions
The Arrow compute library has a global FunctionRegistry, which allows looking up functions by name and listing what is available to call. The list of available compute functions can also be found in the Arrow documentation at https://arrow.apache.org/docs/cpp/compute.html#available-functions. Let's see how to execute these functions now!
Using the C++ compute library
The compute library is managed as a separate module in the base Arrow package. If you've compiled the library yourself from source, make sure that you've used the ARROW_COMPUTE=ON option during configuration.
Example 1 – adding a scalar value to an array
Our first example is going to be a simple scalar function call on an array of data, using the same Parquet file as we did previously in the C Data API examples:
- First things first, we need to read the column we want from the Parquet file. We can use the Parquet C++ library to open the file and it provides...
