OSV-2020-63 UNKNOWN READ in arrow::BaseBinaryBuilder<arrow::BinaryType>::UnsafeAppend

OSS-Fuzz report: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20697 Crash type: UNKNOWN READ Crash state: arrow::BaseBinaryBuilder::UnsafeAppend parquet::PlainByteArrayDecoder::DecodeArrowDense parquet::PlainByteArrayDecoder::DecodeArrow...