* optimize merge strategy
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* #2365
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* fix typo
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* optimize search
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* code format
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* merge manager
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* fix build error
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* layered merge strategy
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* fix ut
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* use simple
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* fix parallel multi collections query crashissue
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* #1686 API search_in_files cannot work correctly when vectors is stored in certain non-default partition
Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

* #1686 API search_in_files cannot work correctly when vectors is stored in certain non-default partition
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* refine request code
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* typo
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* combine search request
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* combine search request
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* #1728 Optimize request handler to combine similar query
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* typo
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* remove some log

* #1240 Update license declaration of each files
Signed-off-by: Njinhai <hai.jin@zilliz.com>

* #1240 Update CHANGELOG
Signed-off-by: Njinhai <hai.jin@zilliz.com>

* refactoring(create_table done)

* refactoring

* refactor server delivery (insert done)

* refactoring server module (count_table done)

* server refactor done

* cmake pass

* refactor server module done.

* set grpc response status correctly

* format done.

* fix redefine ErrorMap()

* optimize insert reducing ids data copy

* optimize grpc request with reducing data copy

* clang format

* [skip ci] Refactor server module done. update changlog. prepare for PR

* remove explicit and change int32_t to int64_t

* add TracerUtil

* Interceptor ok

* add handler

* add context

* minor update

* keep span in trace context

* add span in search okay

* Update Context.cpp

* refactor

* refactor

* refactor

* format

* add context in SearchJob

* trace search okay

* add back finish span in interceptor

* add namespace

* add tracing config in server config

* add random id

* debug mode okay

* update CMakeLists

* add opentracing to cmake

* update unittest

* add tracing namespace

* remove std::run_time error

* add lock when erasing context_map

* update tracing config

* lint

* update CHANGELOG

* small fix

* fix server unit test

* fix scheduler unit test

* fix db unit test

* lint

* fix db unit test gpu version

* rename to tracing_config

* fix

* update

* trigger ci