readParquetSchema without loading entire file

[AshyIsMe]

Intended to allow reading just the schema from a parquet file without having to read all of the data into memory.

Unfortunately this approach still reads the entire file into memory (and then seems to leak that memory immediately...).

It looks like this is a limitation of the arrow glib C binding but that seems so brain-dead that I surely must be wrong...

[interregna]

Sounds like this doesn't solve the problem. Will take a look and see if there's some way to release the memory and not read the whole file.