[SPARK-11694][FOLLOW-UP] Clean up imports, use a common function for metadata and add a test for FIXED_LEN_BYTE_ARRAY #9754
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As discussed #9660 #9060, I cleaned up unused imports, added a test for fixed-length byte array and used a common function for writing metadata for Parquet.
For the test for fixed-length byte array, I have tested and checked the encoding types with parquet-tools.