CreateQuery T1 (children 4)
 Identifier T1
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration A (children 1)
    DataType Int32
   ColumnDeclaration B (children 1)
    DataType Int32
 Storage definition (children 2)
  Function MergeTree
  Identifier A
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 2)
     Literal UInt64_1 (alias A)
     Literal UInt64_2 (alias B)
