1. Fix some `passedByValue` issues. 2. Fix some `dereferenceBeforeCheck` issues. 3. Fix some `uninitMemberVar` issues. 4. Fix some iterator `eraseDereference` issues. 5. Fix compile issue introduced from #7923 #7905 #7848
How to use:
1. g++ doris_client.cpp -o doris_client `mysql_config --cflags --libs`
2. ./doris_client
What can this demo do:
This is a cpp demo for doris client, you can test basic function such as
connection, CRUD of your doris. You should install mysql prior to running
this demo.