Explain EXPLAIN SYNTAX (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    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)
       Function modulo (children 1)
        ExpressionList (children 2)
         Identifier number
         Literal UInt64_2
       Literal UInt64_3
     Function modulo (children 1)
      ExpressionList (children 2)
       Identifier number
       Literal UInt64_2
    ExpressionList (children 1)
     OrderByElement (children 1)
      Identifier k
