CreateQuery t (children 4)
 Identifier t
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration id (children 1)
    DataType UInt32
 Storage definition (children 2)
  Function MergeTree
  Identifier id
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Literal UInt64_1
