Avoid serialization of pyarrow tables using PyArrowConvert in pre_transform_spec #111
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This avoids the copy and serialization steps that were required previously
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Overview
This PR updates the
pre_transform_specfunctionality to avoid copying/serializing PyArrow tables by using thePyArrowConvertfunctions from thearrow-rscrate.This PR also follows the
datafusion-pythonproject by enabling themimallocglobal allocator (datafusion-contrib/datafusion-python#30) in thevegafusion-python-embedlibrary.