These Parquet files were created by modifying Impala's HdfsParquetTableWriter.

String Data
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These files have two string columns 'a' and 'b'. Each columns using different compression types.

tinytable_0_gzip_snappy.parq: column 'a' is compressed by gzip, column 'b' is compressed by snappy
tinytable_1_gzip_snappy.parq: column 'a' is compressed by snappy, column 'b' is compressed by gzip