fix(query): fix coverity issues.

fix: add cachesize in show create database result

fix: fix show create table crash issue

fix(wal): reference

fix: enable adjust numOfVnodeFetchThreads

fix: get next row from rb tree from last files when backward scaning

fix :  avoid invalid read/write

Test3.0/lihui

enh(stream): internal optimize

fix: commit txn for rsma

fix(shell): correct the position of cursor error when  input chinese 

fix(stream):session window max_delay crash

enh: alter db replica

some problems of parser

test: add case for alter dnode