Explain EXPLAIN QUERY TREE (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Function count (children 1)
      ExpressionList
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function numbers (children 1)
        ExpressionList (children 1)
         Literal UInt64_1000
    ExpressionList (children 3)
     ExpressionList (children 3)
      Identifier number
      Function plus (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_1
      Function plus (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_2
     ExpressionList (children 2)
      Function modulo (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_2
      Function modulo (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_3
     ExpressionList (children 2)
      Function divide (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_2
      Function divide (children 1)
       ExpressionList (children 2)
        Identifier number
        Literal UInt64_3
