AlterQuery  03593_backup_with_broken_projection (children 3)
 ExpressionList (children 1)
  AlterCommand UPDATE (children 2)
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier id
     Literal UInt64_0
   ExpressionList (children 1)
    Assignment _row_exists (children 1)
     Literal UInt64_0
 Identifier 03593_backup_with_broken_projection
 Set
