SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Asterisk
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Function viewExplain (children 1)
              ExpressionList (children 3)
               Literal \'EXPLAIN QUERY TREE\'
               Literal \'\'
               Subquery (children 1)
                SelectWithUnionQuery (children 1)
                 ExpressionList (children 1)
                  SelectQuery (children 2)
                   ExpressionList (children 1)
                    Asterisk
                   TablesInSelectQuery (children 2)
                    TablesInSelectQueryElement (children 1)
                     TableExpression (children 1)
                      TableIdentifier t1
                    TablesInSelectQueryElement (children 2)
                     TableExpression (children 1)
                      TableIdentifier t2
                     TableJoin (children 1)
                      Function and (children 1)
                       ExpressionList (children 2)
                        Function equals (children 1)
                         ExpressionList (children 2)
                          Identifier t1.x
                          Identifier t2.x
                        Function not (children 1)
                         ExpressionList (children 1)
                          Function or (children 1)
                           ExpressionList (children 2)
                            Function equals (children 1)
                             ExpressionList (children 2)
                              Identifier t1.x
                              Literal UInt64_1
                            Function isNull (children 1)
                             ExpressionList (children 1)
                              Identifier t1.x
   Function ilike (children 1)
    ExpressionList (children 2)
     Identifier explain
     Literal \'%function_name: isNull%\'
