Explain EXPLAIN QUERY TREE (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Function tuple (children 1)
      ExpressionList (children 1)
       Function sumIf (children 1)
        ExpressionList (children 2)
         Function toInt64 (children 1)
          ExpressionList (children 1)
           Literal UInt64_1
         Literal UInt64_1
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function numbers (children 1)
        ExpressionList (children 1)
         Literal UInt64_100
    Set
