{ "Columns":[ { "Name":"building", "Multiplicity":"1", "Type":"String" }, { "Name":"meter", "Multiplicity":"1", "Type":"String" }, { "Name":"funcid", "Multiplicity":"1", "Type":"Long" }, { "Name":"receivetime", "Multiplicity":"1", "Type":"String" }, { "Name":"data", "Multiplicity":"1", "Type":"Double" } ], "Key":[ "building", "meter", "funcid", "receivetime" ], "Indexes":[ ] }