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{ "_yql_view_ksv"="SELECT key as k, subkey as s, value as v FROM self"; "_yql_row_spec" = { "Type" = [ "StructType"; [ [ "key"; [ "DataType"; "String" ] ]; [ "subkey"; [ "DataType"; "String" ] ]; [ "value"; [ "DataType"; "String" ] ] ] ] } }