Explain EXPLAIN QUERY TREE (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 5)
    ExpressionList (children 1)
     Function avg (alias k) (children 1)
      ExpressionList (children 1)
       Function multiply (children 1)
        ExpressionList (children 2)
         Function log (children 1)
          ExpressionList (children 1)
           Literal UInt64_2
         Identifier number
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       Function numbers (children 1)
        ExpressionList (children 1)
         Literal UInt64_10000000
    ExpressionList (children 2)
     Function modulo (children 1)
      ExpressionList (children 2)
       Identifier number
       Literal UInt64_5
     Function multiply (children 1)
      ExpressionList (children 2)
       Function modulo (children 1)
        ExpressionList (children 2)
         Identifier number
         Literal UInt64_5
       Function modulo (children 1)
        ExpressionList (children 2)
         Identifier number
         Literal UInt64_5
    Function less (children 1)
     ExpressionList (children 2)
      Function multiply (children 1)
       ExpressionList (children 2)
        Function modulo (children 1)
         ExpressionList (children 2)
          Identifier number
          Literal UInt64_5
        Function modulo (children 1)
         ExpressionList (children 2)
          Identifier number
          Literal UInt64_5
      Literal UInt64_5
    ExpressionList (children 1)
     OrderByElement (children 1)
      Identifier k
