* PR 983: doc: fix nav bar
* PR 982: fix: batch merge causing redundant row
* PR 981: fix: use the same interface
* PR 979: docs: added logo
* PR 980: docs: Update README.md
* PR 975: Simplify the ludwig dependency
* PR 972: feat: improve dev doc
* PR 971: Revert "feat: Integrating thirdy party Slack API "
* PR 967: feat: Integrating thirdy party Slack API
* PR 966: Developer guide for new structure data source integration
* PR 949: feat: improve circle ci
* PR 946: Support `SELECT Func