[BUG] CudfColumnSizeOverflowException in populating a column of input file name

[jihoonson]

Describe the bug GpuInputFileName.columnarEval populates a string column with a scalar value which is the input file path. Since the file path length can vary, this can throw the CudfColumnSizeOverflowException if inputFilePath.getLength() * batch.numRows() exceeds the cudf column size limit. The file path was about 200 bytes long when I saw this error in my testing.

Steps/Code to reproduce bug

Place your data set in a directory where its path length is significantly long and read it. Your data set should be reasonably large as well so that inputFilePath.getLength() * batch.numRows() exceeds the cudf column size limit.

Expected behavior

The plugin should be able to handle this automatically by adjusting the batch size based on the file path length.