fix(sync): wait until apply queue is empty when restore

fix:修改SERVER_STATUS的语法实例

将SELECT SERVER_VERSION()改为SELECT SERVER_STATUS()

enh(sync): log entry cache for sync

fix(test):uncomment C# docs-example temporily

* docs(diver):C# add docs with WebSocket

* docs(driver):C# docs update with commnets

fix(query): fix percentile crash on large data set

fix: wlock for meta update tag value

fix: enable sml test cases

feat: update taostools 285b5e0 for3.0

fix: remove double free msg's pCont

feat:Complete the automatic table creation function for taosX 

feat(steam):optimize window close

fix: add udfd resident funcs that teardown when udfd exits

fix: update dbOrigSize before releasing dirty pages

Feat/stream compression

enh: the expression in project is pushed down to scan

feat(stream): optimize disc buff