CreateQuery t1 (children 3)
 Identifier t1
 Storage definition (children 1)
  Function Log (children 1)
   ExpressionList
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 2)
    ExpressionList (children 1)
     Asterisk
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.tables (alias t)
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       TableIdentifier system.databases (alias d)
      TableJoin (children 1)
       Function equals (children 1)
        ExpressionList (children 2)
         Identifier t.database
         Identifier d.name