* prepare change memmanager for wal
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

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

* rewrite insert memmanager
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

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

* rewrite insert machinery
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

* insert fields validation
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

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

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

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

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

* fix get entity by id bug
Signed-off-by: Ngroot <yihua.mo@zilliz.com>

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

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

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

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

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

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

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

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