ARROW-10225: [Rust] [Parquet] Fix null comparison in roundtrip
ARROW-10225: [Rust] [Parquet] Fix null comparison in roundtrip

Closes #8388 from nevi-me/ARROW-10225

Authored-by: Neville Dipale <4e1ab218b24f06847d563ff3773c7517c139f863@gmail.com>
Signed-off-by: Neville Dipale <4e1ab218b24f06847d563ff3773c7517c139f863@gmail.com>

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