Fixed issue where wasNull=true could not be assigned because the previous value wasNull

[TD-10770]<fix>: fix python connector tests and examples error in case of new schemaless api (#8458)

* [TD-10770]<fix>: fix python connector tests and examples error in case of new schemaless api

* [TD-5892]<fix>: update python connector version to 2.1.1

* [TD-3197] <fix>: fix taosdemo coverity scan issues.

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

fix subscribeTest pids uninitialized.

* [TD-3197] <fix>: fix taosdemo coverity scan issues.

* [TD-3197] <fix>: fix coverity scan issues.

check super tbl info pointer.

* [TD-3197] <fix>: fix coverity scan issues.

move sub tbl query thread join into loop

* [TD-3197] <fix>: fix coverity scan issues.

remove unused variable

* [TD-3197] <fix>: fix coverity scan issues.

use more secure random library

* [TD-3197] <fix>: fix coverity scan issues.

use strncpy for more safe

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

replace arc4random with rand().

* [TD-3197] <fix>: fix coverity scan issues.

check stb info pointer for start time

* [TD-3197] <fix>: fix coverity scan issues.

fix strcpy vulnerability

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

modify taosdemoTest2. try to check database continously.

* [TD-3197] <fix>: taosdemo coverity scan issues.

* [TD-3197] <fix>: fix memory leak when parsing arguments.

* [TD-3197] <fix>: fix cmake strip arguments.

* [TD-3197] <fix>: taosdemo coverity scan.

fix cmake string manipulation.

* [TD-3197]<fix>: taosdemo coverity scan issue.

configDir buffer overwrite.

* [TD-3197]<fix>: coverity scan issue.

taosdump argument validation.

* [TD-3197]<fix>: taosdemo and taosdump coverity scan issues.

* [TD-3197]<fix>: taosdemo coverity scan.

append result buf to file. for develop branch.

* exit if read sample file failed.

* fix converity scan issue.

* fix coverity scan issue.

* fix coverity scan memory leak.

* fix resource leak reported by coverity scan.

* fix taosdemo coverity scan issue.

* fix tcsetattr and getchar return value determination bug.

* fix coverity scan issue.

* fix two more coverity scan issues.

* fix stmt batch coverity scan issue.

* change to portable format.

* delete tests/examples/c/'-g' file

* fix example compile error.

* fix coverity scan issue

* fix taosdemo coverity scan issue.

* fix taosdemo test case for restful query

* make initOfQueryMeta() back to solve restful issue.

* fix test case keep 36 days.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-10401]<feature>: tdengine plugin based on datax

* datax JNI plugin

* remove getGlobalMethod in dataxPlugin method

* change

* change

* change

* taos_schemaless changed

* add getErrMsgByCode for insertOpentsdbJson

* remove useless print

* change implements

* fix Darwin compile error

* [TD-10771]<fix>: fix invalid syntax error for python2
Co-authored-by: NHuo Linhe <linhehuo@gmail.com>

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