040000 tree d40bec2b02df24c82dcedae3716e72dcedd270ed	caching
040000 tree 2daba286c55cbb7c5456a22a06e4fc41598f68c9	comparison
040000 tree 96b0eb2dab28acbc914d647d58db3d565cff8e89	database
040000 tree ead11b0f4c4aa8ac898320b314cf931cfa5ac368	hadoop
040000 tree e51e863e4e4023847e54d3ef20ba233924df688a	platforms
040000 tree 980cf1e16ead9a02117db612d632f784e1130e55	spark