refactor(sync): adjust elect timer

modify start api for no remove taosdlog file

fix: alter table check

fix: fix merge join crash issue

enh: improve test coverage of tsma

test: refine query cases

fix(executor):add lock to hash map

fix: zero new dest pages to avoid double free ovfl cell

test: add data and topic of taosdshell cases

fix(util):  improve coverage rate with removing no reference function

fix: remove/comment out unused code for more coverage

enh: redistribute vgroup

fear(stream): add log

fix(query):set correct column match info size.