CreateQuery t (children 3)
 Identifier t
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration c0 (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int
 Storage definition (children 4)
  Function MergeTree (children 1)
   ExpressionList
  Identifier c0
  Identifier c0
  Set
