Contributor Challenges (Collection-2)

[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):

1. 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.
2. 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.

Documentation

• docs: translate OpenMLDB QuickStart from Chinese to English #1321
• docs: translate the Java SDK quickstart from Chinese to English #1322
• docs: translate the Python SDK quickstart from Chinese to English #1323
• doc translation (Chinese to English): milestones #1489
• doc translation (Chinese to English): standalone_vs_cluster #1490
• doc: update the English version of compilation #1491
• doc translation (Chinese to English): install_deploy #1492
• doc translation (Chinese to English): conf #1493
• doc translation (Chinese to English): cli #1494
• doc translation (Chinese to English): rest_api #1495

Coding (Easy)

• spark connector: should handle the returns after write  #1329
• importer: count how many rows we read #1327
• Resolve the compile warning of openmldb-batch #1320
• Resolve the JavaDoc warning of openmldb-jdbc #1319
• Add assertion in unit test of OpenmldbCatalogService #1317
• Remove set from src/base dir #1289
• Delete unused scripts and test cases #1288
• Resolve the compiling warnings like comparison of integer expressions of different signedness #1373
• taskmanager: compare int with null #1377
• batch: replace the deprecated registerTempTable() to reslove the compile warning #1407
• batch: compile warning that check a long for null #1408
• Rename fedb to OpenMLDB in some files #1409
• Add return after the switch statement #1410
• Remove PZFPGA_ENABLE macro in cmd/openmldb.cc #1411
• Rename spName to deploymentName in SqlExecutor #1447
• batch: return error if select into gets empty #1459
• Rename oepnmldb_type to openmldb_type in SchemaAdapter #1499
• Add override to the method of MultipleResultSetSQL #1508
• Delete java dir from gitignore #1531

Coding (Normal)
Before getting start with the built-in function development, you may read our helpful development guide for built-in function (中文版本).

• built-in function: Support degrees() function #787
• built-in function: Support RADIANS() function #788
• built-in-function: Support char(int) function #817
• built-in function: Support char_length() and character_length() function #818
• built-in function: Support hex() function #819
• built-in function: Support locate(substr, str[, pos]) function #820
• built-in-function: Support last_day(TIMESTAMP) function #821
• built-in function: Support unhex() function #822

Misc.

• Support GitHub Codespaces #1255
• build(proto c): move openmldb generated proto cpp files into build directory #1091
• enable python style check via pylint #315