swap_hash_join is no longer public so comet doesn't compile

[alamb]

Describe the bug

• part of to Test DataFusion 44.0.0 with Comet #13835

When upgrading comet to use the latest datafusion pun (andygrove/datafusion-comet#1) it fails to compile with the following error:

error[E0603]: function `swap_hash_join` is private
   --> core/src/execution/planner.rs:56:41
    |
56  |     physical_optimizer::join_selection::swap_hash_join,
    |                                         ^^^^^^^^^^^^^^ private function
    |
note: the function `swap_hash_join` is defined here
   --> /Users/andrewlamb/.cargo/git/checkouts/datafusion-c36d6291a88e48f3/e99e02b/datafusion/core/src/physical_optimizer/join_selection.rs:179:1
    |
179 | / pub(crate) fn swap_hash_join(
180 | |     hash_join: &HashJoinExec,
181 | |     partition_mode: PartitionMode,
182 | | ) -> Result<Arc<dyn ExecutionPlan>> {
    | |___________________________________^

This appears to have been introduced in #13893 from @berkaysynnada

To Reproduce

See andygrove/datafusion-comet#1

Expected behavior

No response

Additional context

No response