[TS-925]<fix>(query): fixed inconsistant primary col name

[TS-927]<fix>(query): fix fill(linear) with null values

[TS-802]<fix>(query): add TSDB_FUNC_LAST_DST

[TD-12730]<test>remove sys.py

[TS-927]<fix>(query): fix fill(linear) with null values

[TS-983]<feature>(connector,query,insert,other):create subtable to specific vgroups by _taos_meta_sync_table_name_taos_

TS-1026: fix subquery such as select * (select * from empty_stable) empty result error 

[TS-983]<feature>(connector,query,insert,other):create subtable to specific vgroups by _taos_meta_sync_table_name_taos_

[TD-1026](query,insert,other,connector,tools):fix test case so that it can generate new table name when tablename is all lower

[TS-445] <feature>: master limit offset optimization

Fix/TS-530 CQ Support write  result to superTable

[TS-802]<bug>(query): fixed first last problem with order by

[TS-1026](query,insert,other,connector,tools):fix app error of select from (select * from empty_stable) by set subquery command to retrieve empty results

[TS-2016](query,insert,other,connector,tools):fix app error of select from (select * from empty_stable) by set subquery command to retrieve empty results

[TS-995]<fix>(query): validate pTableCheckInfo when querying last/las…

[TS-981]<fix>(other): new config parameter offlineInterval