Explain EXPLAIN QUERY TREE (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Function materialize (alias s) (children 1)
      ExpressionList (children 1)
       Literal \'Привет, World\'
    Function or (children 1)
     ExpressionList (children 3)
      Function like (children 1)
       ExpressionList (children 2)
        Identifier s
        Literal \'hell%\'
      Function ilike (children 1)
       ExpressionList (children 2)
        Identifier s
        Literal \'%привет%\'
      Function ilike (children 1)
       ExpressionList (children 2)
        Identifier s
        Literal \'world%\'
    Set
