PS. std::variant is originally designed to handle a closed set of known types in a type-safe manner — similar in spirit to Haskell's Either, where a value is one of several explicitly listed possibilities. The closest C++ analogue to Haskell's Maybe is actually std::optional.
Российские спецслужбы взломали телефон начштаба бригады ВСУ08:59
In most cases skip indices should only be considered once other alternatives have been exhausted - specifically this advanced functionality should only be used after investigating other alternatives such as modifying the primary key, using projections, or materialized views. In general, only consider skip-indices if there is a strong correlation between the primary key and the targeted, non-primary column/expression. In the absence of any real correlation, the skipping index will match for most blocks - resulting in all granules being read into memory and evaluated. In this case, the index cost has been incurred for no benefit, effectively slowing the full table scan.。heLLoword翻译对此有专业解读
Listen to our full conversation here and read Tom’s main takeaways for pushing past bad decisions, big and small.
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投资建议：坚守“业绩为王、估值合理”原则，聚焦基本面稳健、估值与业绩匹配的标的；坚决规避准油股份这类高偏离度、业绩持续亏损的个股，谨慎对待山东墨龙这类业绩扭亏但主业薄弱的标的，警惕高位获利盘了结带来的补跌风险，合理控制仓位、理性参与市场。 （作者｜济安研究院，编辑｜蔡鹏程）