[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC):2025-09-05。"],[],[],null,["# List query optimizer versions\n\nSpanner provides a built-in `SPANNER_SYS.SUPPORTED_OPTIMIZER_VERSIONS`\ntable to keep track of query optimizer versions. You can retrieve this data\nusing SQL queries.\n\n`SPANNER_SYS.SUPPORTED_OPTIMIZER_VERSIONS` table schema\n-------------------------------------------------------\n\n### List all supported optimizer versions\n\n SELECT * FROM SPANNER_SYS.SUPPORTED_OPTIMIZER_VERSIONS\n\nAn example result:\n\nWhat's next\n-----------\n\n- To learn more about the query optimizer, see [Query optimizer overview](/spanner/docs/query-optimizer/overview).\n- To learn more about how the query optimizer has evolved, see [Query optimizer\n versions](/spanner/docs/query-optimizer/versions)."]]