CreateQuery data (children 3)
 Identifier data
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration key (children 1)
    DataType Int
   ColumnDeclaration value (children 1)
    DataType AggregateFunction (children 1)
     ExpressionList (children 2)
      Identifier sum
      DataType UInt64
 Storage definition (children 2)
  Function AggregatingMergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier key
    Identifier value
