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TiFlash v5.3.0
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@zhouqiang-cl zhouqiang-cl released this 29 Nov 08:25
v5.3.0
0c9c1ff
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Improvements

  • Improve the execution efficiency of the TableScan operator greatly
  • Improve the execution efficiency of the Exchange operator
  • Reduce write amplification and memory usage during GC of the storage engine (experimental feature)
  • Improve the stability and availability of TiFlash when TiFlash restarts, which reduces possible query failures following the restart
  • Support pushing down multiple new String and Time functions to the MPP engine
  • String functions: LIKE pattern, FORMAT(), LOWER(), LTRIM(), RTRIM(), SUBSTRING_INDEX(), TRIM(), UCASE(), UPPER()
  • Mathematical functions: ROUND (decimal, int)
  • Date and time functions: HOUR(), MICROSECOND(), MINUTE(), SECOND(), SYSDATE()
  • Type conversion function: CAST(time, real)
  • Aggregation functions: GROUP_CONCAT(), SUM(enum)
  • Support 512-bit SIMD
  • Enhance the cleanup algorithm for outdated data to reduce disk usage and read files more efficiently
  • Fix the issue that dashboard does not display memory or CPU information in some non-Linux systems
  • Unify the naming style of TiFlash log files (keep the naming style consistent with that of TiKV) and support dynamic modification of logger.count and logger.size
  • Improve the data validation capability of column-based files (checksums, experimental feature)

Bug Fixes

  • Fix the issue of inaccurate TiFlash Store Size statistics
  • Fix the issue that TiFlash fails to start up on some platforms due to the absence of library nsl
  • Block the infinite wait of wait index when writing pressure is heavy (a default timeout of 5 minutes is added), which prevents TiFlash from waiting too long for data replication to provide services
  • Fix the slow and no result issues of the log search when the log volume is large
  • Fix the issue that only the most recent logs can be searched when searching old historical logs
  • Fix the possible wrong result when a new collation is enabled
  • Fix the possible parsing errors when an SQL statement contains extremely long nested expressions
  • Fix the possible Block schema mismatch error of the Exchange operator
  • Fix the possible Can't compare error when comparing Decimal types
  • Fix the 3rd arguments of function substringUTF8 must be constants error of the left/substring function
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