fix a few failing roundtrip tests#1

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nevi-me wants to merge 5 commits intointeger32llc:roundtrip-testsfrom

nevi-me:roundtrip-tests

Commits on Sep 25, 2020

ARROW-8289: [Rust] Parquet Arrow writer with nested support

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ARROW-8423: [Rust] [Parquet] Serialize Arrow schema metadata
nevi-me
committed
ARROW-10095: [Rust] Update rust-parquet-arrow-writer branch's encode_arrow_schema with ipc changes

carols10cents
authored and
nevi-me
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Commits on Oct 2, 2020

Add roundtrip Arrow -> Parquet tests for all Arrow DataTypes
carols10cents
committed

Commits on Oct 3, 2020

fix a few failing roundtrip tests
nevi-me
committed