* cherry pick from develop branch.

* [TD-5136]<feature>: taosdemo simulate real senario.

* update test case according to taosdemo change

* adjust range of semi-random data.

* make demo mode use different tag name and value.

* change malloc to calloc for pid allocation.

* fix typo.

* fix binary length default value and group id logic.

* fix help msg.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

fix: fix altering schema  too much corrupting meta file

merge from cenc into master

[TD-6184]<enhance>: optimize insert from imported file

Feature/cenc

* [TD-5844]<feature>: make cmd line parameter similar.

* fix test case align with taosdemo change.

* fix windows stack overflow issue.

* fix mac compile error.

* fix taosdemo cmdline parameter in tests/pytest/tools/taosdemoAllTest/NanoTestCase/taosdemoTestSupportNanoInsert.py

* make taos.exe use mysql style password input.

* make taos shell and taosdump use mysql style password input.

* determine scanf return value.

* cherry pick from develop/feature branch.

merge from 2.0 branch

[TD-6020]fix taos crash issue

[TD-6198]<fix> fix bigint sum error

* cherry pick from develop branch.

* [TD-5136]<feature>: taosdemo simulate real senario.

* update test case according to taosdemo change

* adjust range of semi-random data.

* make demo mode use different tag name and value.

* change malloc to calloc for pid allocation.

* fix typo.

* fix binary length default value and group id logic.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

[TD-5798] <test> add case for td5798

change version number

[TD-6165]<enhance>: use memcpy to replace wcsncmp for nchar type comparision

[TD-6165]<enhance>: use memcpy to replace wcsncmp for nchar type comparision

[TD-6149]fix msg null issue

* [TD-6166]<fix>: pointer not initialized led taos.exe exit on windows.

* another line.

* [TD-6166]<fix>: pointer not initialized led taos.exe exit on windows.

* another line.

[TD-6135]fix interp crash issue

[TD-6086]<fix>:add test case

[TD-6017]<fix>:support top/bottom query is not the first expression when validate order by node