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