CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType Int32
   ColumnDeclaration pv (children 1)
    DataType AggregateFunction (children 1)
     ExpressionList (children 2)
      Identifier sum
      DataType Int32
 Storage definition (children 2)
  Function AggregatingMergeTree (children 1)
   ExpressionList
  Identifier id
