CreateQuery test_table (children 3)
 Identifier test_table
 Storage definition (children 2)
  Function MergeTree
  Identifier sum
 SelectWithUnionQuery (children 1)
  ExpressionList (children 2)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Literal UInt64_100 (alias sum)
   SelectQuery (children 1)
    ExpressionList (children 1)
     Literal UInt64_200 (alias sum)
