Explain EXPLAIN (children 1)
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 4)
    ExpressionList (children 3)
     WithElement (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 2)
           Identifier key
           Function ROW_NUMBER (alias rn) (children 1)
            ExpressionList
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier test
     WithElement (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 2)
           Identifier key
           Function greater (alias has_any) (children 1)
            ExpressionList (children 2)
             Function count (children 1)
              ExpressionList
             Literal UInt64_0
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier test
          ExpressionList (children 1)
           Identifier key
     WithElement (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Asterisk
          TablesInSelectQuery (children 3)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier view_1 (alias v1)
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier view_2 (alias v2_1)
            TableJoin (children 1)
             ExpressionList (children 1)
              Identifier key
           TablesInSelectQueryElement (children 2)
            TableExpression (children 1)
             TableIdentifier view_2 (alias v2_2)
            TableJoin (children 1)
             ExpressionList (children 1)
              Identifier key
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier v1.rn
            Literal UInt64_1
    ExpressionList (children 1)
     Function count (children 1)
      ExpressionList
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier events
    Identifier v2_1.has_any
