cols desc #29882
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cols desc #29882
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dapan1121
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Feb 21, 2025
| COLS(select_function(expr), output_expr1, [, output_expr2] ... ) | ||
| ``` | ||
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| **功能说明**：在选择函数 func(expr) 执行结果所在数据行上，执行表达式 output_expr1, [,output_expr2]，返回其结果，func(expr)结果不输出. |
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语法里是select_function(expr)这里是func(expr)，需要保持一致
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| **使用说明:** | ||
| - func 函数类型：必须是单行选择函数（输出结果为一行的选择函数，例如 last 是单行选择函数， 但 top 是多行选择函数）。 | ||
| - 注意, 参数 func 的结果并没有返回，如需输出 func 结果，需要在 cols 中加上相应的 output_expr 参数。 |
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如果输出func结果，增加示例：select fist(ts), cols(first(ts), c1) from ...
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