040000 tree a16a1d5f3478d8177a8cbf6426b29e6f9f0930f1	caching
040000 tree 8a0cb422ce0bb5ae42343f55e0576c89f55afdd1	comparison
040000 tree 78993a35807b3050ac96f7491969e6869a308ee2	database
040000 tree d45219d4a9743817c06ed4c0a0fb44a2cc0e77ce	hadoop
040000 tree 8a29731c0f2da52ac5c7772745528d50cfa5fa75	platforms
040000 tree ab0ffa126a71fa1654d89eb4b527e7f0caec1914	spark