v5.0.2 is a patch release. Key changes include:

• Avoid frequently reading the mysql.stats_histograms table if the cached statistics is up-to-date to avoid high CPU usage #24317;
• Fix the panic issue caused by using the prefix index and index join in some cases #24547 #24716 #24717.

v5.2.0-alpha is a pre-release release. See full release notes for details.

v4.0.13 is a patch release. Key changes include:

• Support changing an AUTO_INCREMENT column to an AUTO_RANDOM one #24608;
• Add the infoschema.client_errors_summary tables to help users keep track of the errors that have been returned to clients #23267.

v5.1.0-alpha is a pre-release release. See full release notes for details.

v5.0.1 is a patch release. Key changes include:

• Fix the issue that the execution result of project elimination might be wrong when the projection result is empty #24093;
• Fix the issue of wrong query results when a column contains NULL values in some cases #24063.

v5.0.0 is a major release. Key changes include:

• tidb_gc_concurrency;
• tidb_gc_enable.

v4.0.12 is a patch release. Key changes include:

• Refine the output information of the EXPLAIN statement for the batch cop mode #23164;
• Add the warning information for expressions that cannot be pushed to the storage layer in the output of the EXPLAIN statement #23020.

v4.0.11 is a patch release. Key changes include:

• Support the utf8_unicode_ci and utf8mb4_unicode_ci collations #22558;
• Reorder inner joins that are simplified from outer joins #22402.

v4.0.10 is a patch release. Key changes include:

• Make the size limit of transaction entries configurable #21843;
• Fix a concurrency bug that might cause the batch client timeout #22336.

v5.0.0-rc is a pre-release release. Key changes include:

• Support collation utf8mb4_unicode_ci and utf8_unicode_ci;
• project.

v5.0.2 is a patch release. Key changes include:

• Avoid frequently reading the mysql.stats_histograms table if the cached statistics is up-to-date to avoid high CPU usage #24317;
• Fix the panic issue caused by using the prefix index and index join in some cases #24547 #24716 #24717.

v5.2.0-alpha is a pre-release release. See full release notes for details.

v4.0.13 is a patch release. Key changes include:

• Support changing an AUTO_INCREMENT column to an AUTO_RANDOM one #24608;
• Add the infoschema.client_errors_summary tables to help users keep track of the errors that have been returned to clients #23267.

v5.1.0-alpha is a pre-release release. See full release notes for details.

v5.0.1 is a patch release. Key changes include:

• Fix the issue that the execution result of project elimination might be wrong when the projection result is empty #24093;
• Fix the issue of wrong query results when a column contains NULL values in some cases #24063.

v5.0.0 is a major release. Key changes include:

• tidb_gc_concurrency;
• tidb_gc_enable.

v4.0.12 is a patch release. Key changes include:

• Refine the output information of the EXPLAIN statement for the batch cop mode #23164;
• Add the warning information for expressions that cannot be pushed to the storage layer in the output of the EXPLAIN statement #23020.

v4.0.11 is a patch release. Key changes include:

• Support the utf8_unicode_ci and utf8mb4_unicode_ci collations #22558;
• Reorder inner joins that are simplified from outer joins #22402.

v4.0.10 is a patch release. Key changes include:

• Make the size limit of transaction entries configurable #21843;
• Fix a concurrency bug that might cause the batch client timeout #22336.

v5.0.0-rc is a pre-release release. Key changes include:

• Support collation utf8mb4_unicode_ci and utf8_unicode_ci;
• project.