fix: preserve empty projection when ser/de HashJoinExec and NestedLoopJoinExec
#8487
| Job | Run time |
|---|---|
| 1m 42s | |
| 1m 42s |
HashJoinExec and NestedLoopJoinExec
#8487
| Job | Run time |
|---|---|
| 1m 42s | |
| 1m 42s |