CreateQuery dst (children 3)
 Identifier dst
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration step (children 1)
    DataType UInt16
   ColumnDeclaration rounded_event_time (children 1)
    DataType DateTime
   ColumnDeclaration key (children 1)
    DataType UInt64
   ColumnDeclaration value (children 1)
    DataType AggregateFunction (children 1)
     ExpressionList (children 2)
      Identifier max
      DataType Int64
 Storage definition (children 2)
  Function AggregatingMergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 3)
    Identifier step
    Identifier rounded_event_time
    Identifier key
