* change few default values.

* [TD-3851]<fix>: taosdemo performance boost.

change max sql len default value to 1024*1024
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3962]<fix>: fix insert special character error in preparedStatement

* change

* change

* change

* change

* change

* change

* [TD-3962]<test>: add test cases for insert special character

* change

* change

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

modify smoketest.sh to python3.8

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

* [TD-4025]<fix>: travis ci broken due to valgrind dependency missed.

change focal to bionic.

* [TD-4025]<fix>: travis ci broken due to ubuntu 20.04 repo issue.

cherry pick from master.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

[TD-2639] <docs>: fix lib name typo.

[TD-2639] <docs>: fix url link format.

Merge pull request #5936 from taosdata/dependabot/maven/tests/comparisonTest/cassandra/cassandratest/commons-io-commons-io-2.7

Bump commons-io from 2.4 to 2.7 in /tests/comparisonTest/cassandra/cassandratest

Merge pull request #5937 from taosdata/dependabot/maven/tests/comparisonTest/opentsdb/opentsdbtest/commons-io-commons-io-2.7

Bump commons-io from 2.4 to 2.7 in /tests/comparisonTest/opentsdb/opentsdbtest

* [TD-3985]<fix>: taosdemo timestamp step overflow.

* fix specified subscribe test.

* replace potential overflow of int32 to int64

* replace potential int32 overflow variables to int64.

* replace potential int32 overflow variables to int64.

* change max of int16 to int64 after type changed.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

Feature/query

[TD-2639] <docs>: update description about performance testing tools …

* [TD-3985]<fix>: taosdemo timestamp step overflow.

* fix specified subscribe test.

* replace potential overflow of int32 to int64

* replace potential int32 overflow variables to int64.

* replace potential int32 overflow variables to int64.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

[TD-3882]change compressMsgSize max size

* [TD-3414]<test>: add insert function with json files of taodemo-testcase -repeat

* [TD-3879]add stmt mode for taodemo go

* [TD-3414]<test>: add insert function with json files of taodemo-testcase

* [TD-3918] <test>  add case to verify the bug of TD-3897

* [TD-3453]<test>:modify filepath  in scripts

* Update fulltest.sh

* [TD-3918] <test> fix the case

* Update queryFilterTswithDateUnit.py

* [TD-3850]<fix>: fix vnode write enqueue flowctrl UAF & no response

* Hotfix/sangshuduo/td 3401 query statistic (#5907)

* [TD-3401]<fix>: taosdemo query statistic.

refactor func name.

* [TD-3401]<fix>: taosdemo query statistic.

refactor func name 2.

* [TD-3401]<fix>: taosdemo support query statistic.

implementation.

* cleanup

* [TD-3401]<fix>: taosdemo query statistic.

change us to ms.

* [TD-3401]<fix>: taosdemo query statistic.

increase sql buffer for query.

* [TD-3401]<fix>: taosdemo query statistic

more accurate result.

* [TD-3401]<fix>: taosdemo query statistic.

modify last time logic.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* improve coverage of operations

* [TD-3944]<fix>: make default offline threshold to 10 days. (#5912)
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3572]<enhance>: response out of dnodes if #dnodes <= maxDbReplica

* [TD-3937]<test>: add taosdemo performance test compare scripts

* update script

* Hotfix/sangshuduo/td 3317 for master (#5921)

* [TD-3317]<fix>: taosdemo interlace insertion.

patch for master.

* [TD-3317]<fix>: taosdemo support interlace mode.

adjust remainder rows logic.

* [TD-3317]<fix>: taosdemo support interlace mode.

fix global and stable interlace rows logic.

* [TD-3317]<fix>: taosdemo support interlace mode.

fix 'interlaceRows' is used uninitialized
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3968]<fix>: taosdemo data length should be 16*1024 (#5926)
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3969]<fix>: taosdemo re-enable batch-create-tbl-num
Co-authored-by: tomchon <haoran920c@163.com>
Co-authored-by: Nliuyq-617 <yqliu@taosdata.com>
Co-authored-by: Nwu champion <wuchampion@foxmail.com>
Co-authored-by: Nwu champion <cpwu@taosdata.com>
Co-authored-by: NMinglei Jin <mljin@taosdata.com>
Co-authored-by: Nhuili <52318143+plum-lihui@users.noreply.github.com>
Co-authored-by: NShengliang Guan <slguan@taosdata.com>
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>
Co-authored-by: NPing Xiao <pxiao@taosdata.com>

[TD-3991]fix client log

* [TD-3985]<fix>: taosdemo timestamp step overflow.

* fix specified subscribe test.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

The update contains TD-3983 TD-3912 fixes.

[TD-850] <docs>: fix typo.

[TD-2639] <docs>: remove ambiguous description about select expression.

By this commit, It will close TD-3639.

It will not require test case to write *correct* datetime string to pass
a test case. One test could use seconds, milliseconds or microseconds to
check data.

That means the three tests are equivalent:

```python
.checkData(0, 0, "2020-01-01 00:00:00")
.checkData(0, 0, "2020-01-01 00:00:00.000")
.checkData(0, 0, "2020-01-01 00:00:00.000000")
```

* [TD-3414]<test>: add insert function with json files of taodemo-testcase -repeat

* [TD-3879]add stmt mode for taodemo go

* [TD-3414]<test>: add insert function with json files of taodemo-testcase

* [TD-3918] <test>  add case to verify the bug of TD-3897

* [TD-3453]<test>:modify filepath  in scripts

* Update fulltest.sh

* [TD-3918] <test> fix the case

* Update queryFilterTswithDateUnit.py

* [TD-3850]<fix>: fix vnode write enqueue flowctrl UAF & no response

* Hotfix/sangshuduo/td 3401 query statistic (#5907)

* [TD-3401]<fix>: taosdemo query statistic.

refactor func name.

* [TD-3401]<fix>: taosdemo query statistic.

refactor func name 2.

* [TD-3401]<fix>: taosdemo support query statistic.

implementation.

* cleanup

* [TD-3401]<fix>: taosdemo query statistic.

change us to ms.

* [TD-3401]<fix>: taosdemo query statistic.

increase sql buffer for query.

* [TD-3401]<fix>: taosdemo query statistic

more accurate result.

* [TD-3401]<fix>: taosdemo query statistic.

modify last time logic.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* improve coverage of operations

* [TD-3944]<fix>: make default offline threshold to 10 days. (#5912)
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3572]<enhance>: response out of dnodes if #dnodes <= maxDbReplica

* [TD-3937]<test>: add taosdemo performance test compare scripts

* update script

* Hotfix/sangshuduo/td 3317 for master (#5921)

* [TD-3317]<fix>: taosdemo interlace insertion.

patch for master.

* [TD-3317]<fix>: taosdemo support interlace mode.

adjust remainder rows logic.

* [TD-3317]<fix>: taosdemo support interlace mode.

fix global and stable interlace rows logic.

* [TD-3317]<fix>: taosdemo support interlace mode.

fix 'interlaceRows' is used uninitialized
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3968]<fix>: taosdemo data length should be 16*1024 (#5926)
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

* [TD-3969]<fix>: taosdemo re-enable batch-create-tbl-num
Co-authored-by: tomchon <haoran920c@163.com>
Co-authored-by: Nliuyq-617 <yqliu@taosdata.com>
Co-authored-by: Nwu champion <wuchampion@foxmail.com>
Co-authored-by: Nwu champion <cpwu@taosdata.com>
Co-authored-by: NMinglei Jin <mljin@taosdata.com>
Co-authored-by: Nhuili <52318143+plum-lihui@users.noreply.github.com>
Co-authored-by: NShengliang Guan <slguan@taosdata.com>
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>
Co-authored-by: NPing Xiao <pxiao@taosdata.com>

[TD-850] <docs>: describe limitation about calculation between columns.