zhangstar333

[improve](percentile_approx) use pdqsort to improve percentile_approx function performance

3

## Proposed changes could faster about 1s on table rows of count 150000000 

# Versions have add many be configs in code, But not add docs to explain those. - [x] dev - [ ] 3.0 - [ ] 2.1 - [ ]...

[feature](function)support bit_test function

11

## Proposed changes support bit_test function doc: https://github.com/apache/doris-website/pull/1214

[feature](function)support count_substrings functions

23

## Proposed changes support count_substrings functions doc: https://github.com/apache/doris-website/pull/1211