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tidb-server rc4

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@shenli shenli released this 04 Aug 11:54
· 18 commits to rc4 since this release
  • The SQL query optimizer refactoring:
    • Better support for TopN queries
    • Support the automatic choice of the of the Join physical operator based on the cost
    • Improved Projection Elimination
  • The version check of schema is based on Table to avoid the impact of DDL on the ongoing transactions
  • Support BatchIndexJoin
  • Improve the Explain statement
  • Improve the Index Scan performance
  • Many enhancements have been introduced to be more compatible with MySQL
  • Support the JSON type and operations
  • Support the configuration of query prioritizing and isolation level
  • Speed up DropIndex operation