Explain EXPLAIN QUERY TREE (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 2)
     Function transform (alias value) (children 1)
      ExpressionList (children 4)
       Identifier number
       Literal Array_[UInt64_2, UInt64_4, UInt64_6]
       Literal Array_[\'google\', \'censor.net\', \'yahoo\']
       Literal \'other\'
     Identifier value
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.numbers
    Literal UInt64_10
