[Feature](func) Support function PERIOD_ADD and PERIOD_DIFF #2972
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zclllyybb
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Nov 1, 2025
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所有函数至少有一个某些输入参数为NULL的case
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| | 参数 | 说明 | | ||
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| | `<period>` | 代表一个由年和月组成的周期。<ul><li>**格式**：月份固定占末尾两位，格式解读为 YYYYMM 或 YYMM。若使用 YYMM 格式，当 YY 小于 70 时会被解读为 20YY，当 YY 大于等于 70 时会被解读为 19YY。</li><li>**值范围**：接受 `[0, 2^63-1]` 范围内的整型参数，且最后两位（月份）必须在 `[1, 12]` 范围内。</li><li>**年份位数**：函数不限制年份部分的位数，这意味着年份可以超过四位。</li></ul> | |
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既然年份位数不一定，那么就不能说是YYYYMM和YYMM了，这俩函数的描述还得重新斟酌下
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