HappenLee comments

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                                            HappenLee

[config](vec) control num free block by be config

> please also modify free block in `src/vec/exec/scan/scanner_context.cpp` just a test pr in branch `opt_perf`, if it's effective, I will create a new pr to do this in `master` branch

[feature-wip](array-type) add the array_join function

the function is a agg function. we should use group_concat to do the work. like `sum` `avg` `max`

[exec](agg) multi merge sort opt the PERCENTILE

run buildall

[exec](agg) multi merge sort opt the PERCENTILE

run buildall

[exec](agg) multi merge sort opt the PERCENTILE

run buildall

[fix](json function) fix failed when json_exists_path use not null input

The code seems ugly, we better impl `json_exists_path` in other function not in `json_extract`

[Feature] some mysql function support

> i want try. @liugddx thank you. please chose 1 function

[Feature] some mysql function support

> thank you. please chose 1 function thank you. please chose 1 function @nanfeng1999

[Pipeline](shared_scan_opt) Support shared scan opt in pipeline exec engine

run buildall

[Pipeline](shared_scan_opt) Support shared scan opt in pipeline exec engine

run buildall