MySQL 5.7 Release Notes
The zlib_decompress utility decompresses mysqlpump output that was created using ZLIB compression. zlib_decompress was added in MySQL 5.7.10.
Invoke zlib_decompress like this:
zlib_decompress input_file output_file
mysqlpump --compress-output=ZLIB > dump.zlib zlib_decompress dump.zlib dump.txt
To see a help message, invoke zlib_decompress with no arguments.
To decompress mysqlpump LZ4-compressed output, use lz4_decompress. See Section 4.8.1, “lz4_decompress — Decompress mysqlpump LZ4-Compressed Output”.