libcudf C++ examples using string transforms

This C++ example demonstrates using libcudf transform API to access and create strings columns.

The example source code loads a csv file and produces a transformed column from the table using the values from the tables.

The following examples are included:

1. localize_phone_jit - Using a transform to branch on input columns and returning string values
2. localize_phone_precompiled - Performs same transformation on the table as branching but uses precompiled public APIs
3. compute_checksum_jit - Using a transform to perform a fused checksum on two columns
4. extract_email_jit - Using a transform to get a substring from a kernel
5. extract_email_precompiled - Performs same transformation on the table as output but uses precompiled public APIs
6. format_phone_jit - Using a transform kernel to output a string to a pre-allocated buffer
7. format_phone_precompiled - Performs same transformation on the table as preallocated but uses precompiled public APIs

Compile and execute

# Configure project
cmake -S . -B build/
# Build
cmake --build build/ --parallel $PARALLEL_LEVEL
# Execute
build/output info.csv output.csv 100000

If your machine does not come with a pre-built libcudf binary, expect the first build to take some time, as it would build libcudf on the host machine. It may be sped up by configuring the proper PARALLEL_LEVEL number.