SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 15)
    Identifier array
    Identifier struct.d1
    Identifier struct.a1
    Identifier struct.a2
    Identifier struct.a3
    Identifier struct.a4
    Identifier struct.a5
    Identifier struct.a6
    Identifier class.d1
    Identifier class.a1
    Identifier class.a2
    Identifier class.a3
    Identifier class.a4
    Identifier class.a5
    Identifier class.a6
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier aliases_test
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 1)
       Identifier struct (alias class)
