CreateQuery a (children 3)
 Identifier a
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration x (children 1)
    DataType Int64
   ColumnDeclaration y (children 3)
    DataType Int64
    Literal UInt64_1
    Set
 Storage definition (children 2)
  Function MergeTree
  Identifier x
