Contributor Challenges (Collection-3)

[lumianph]

The OpenMLDB project is a community-driven project, thus we welcome all kinds of contribution from the community. We have started an OpenMLDB Contributor Program, which provides rewards to encourage you to join our community.

Here is the explanation about this program (we also provide a Chinese version here):

We have listed issues that are suitable for contributors who join the OpenMLDB community for the first time (see the below list). If you would like to contribute, please leave a message of "I would like to help". When a PR is submitted, please also link the PR to the corresponding issue.
For a successful contributor, in order to redeem your rewards (mouse pad, USB hub, OpenMLDB customized souvenir and so on), please shoot an email to contact@openmldb.ai, or join Slack to contact us.
Before you start, we strongly encourage to read through our Contribution Guideline.

We have categorized issues to help you find topics that interest you.

Coding (easy)

• Remove unused variable #1746
• use constant instead of int in SimpleResultSet #1762
• check if null in PreparedStatement #1759
• Remove unused gflag variable #1775
• Fix typo of PhysicalAggrerationNode #1767
• remove unused code in SimpleResultSet #1760
• set the constant in getSQLStateType #1758
• Add assertion in unit test of OpenmldbCatalogService #1317
• batch: replace the deprecated registerTempTable() to reslove the compile warning #1407
• refactor const std::shared_ptr<T> to std::shared_ptr<const T> #1293
• batch: compile warning that check a long for null #1408
• Resolve the compile warning of openmldb-batch #1320

Documentations

• docs: translate the Chinese doc of upgrade.md into English #1791
• docs: translate the Chinese doc of backup.md into English #1792
• docs: translate the Chinese doc of scale.md into English #1793
• docs: translate the Chinese doc of monitoring.md into English #1794
• docs: translate the Chinese doc of faq.md into English #1796

Misc.

• Delete java dir from gitignore #1531
• build(proto c): move openmldb generated proto cpp files into build directory #1091
• scripts: improve onebox script #1328
• Resolve the JavaDoc warning of openmldb-jdbc #1319
• enable python style check via pylint #315
• Auto release the installing package of macos  #1894