未验证 提交 a81833c7 编写于 作者: W wade zhang 提交者: GitHub

Merge pull request #19991 from taosdata/docs/isfilled_version

fix _isfilled support version
......@@ -877,8 +877,8 @@ INTERP(expr)
- The number of rows in the result set of `INTERP` is determined by the parameter `EVERY(time_unit)`. Starting from timestamp1, one interpolation is performed for every time interval specified `time_unit` parameter. The parameter `time_unit` must be an integer, with no quotes, with a time unit of: a(millisecond)), s(second), m(minute), h(hour), d(day), or w(week). For example, `EVERY(500a)` will interpolate every 500 milliseconds.
- Interpolation is performed based on `FILL` parameter. For more information about FILL clause, see [FILL Clause](../distinguished/#fill-clause).
- `INTERP` can only be used to interpolate in single timeline. So it must be used with `partition by tbname` when it's used on a STable.
- Pseudocolumn `_irowts` can be used along with `INTERP` to return the timestamps associated with interpolation points(support after version 3.0.1.4).
- Pseudocolumn `_isfilled` can be used along with `INTERP` to indicate whether the results are original records or data points generated by interpolation algorithm(support after version 3.0.2.3).
- Pseudocolumn `_irowts` can be used along with `INTERP` to return the timestamps associated with interpolation points(support after version 3.0.2.0).
- Pseudocolumn `_isfilled` can be used along with `INTERP` to indicate whether the results are original records or data points generated by interpolation algorithm(support after version 3.0.3.0).
### LAST
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......@@ -879,8 +879,8 @@ INTERP(expr)
- INTERP 根据 EVERY(time_unit) 字段来确定输出时间范围内的结果条数,即从 timestamp1 开始每隔固定长度的时间(time_unit 值)进行插值,time_unit 可取值时间单位:1a(毫秒),1s(秒),1m(分),1h(小时),1d(天),1w(周)。例如 EVERY(500a) 将对于指定数据每500毫秒间隔进行一次插值.
- INTERP 根据 FILL 字段来决定在每个符合输出条件的时刻如何进行插值。关于 FILL 子句如何使用请参考 [FILL 子句](../distinguished/#fill-子句)
- INTERP 只能在一个时间序列内进行插值,因此当作用于超级表时必须跟 partition by tbname 一起使用。
- INTERP 可以与伪列 _irowts 一起使用,返回插值点所对应的时间戳(3.0.1.4版本以后支持)。
- INTERP 可以与伪列 _isfilled 一起使用,显示返回结果是否为原始记录或插值算法产生的数据(3.0.2.3版本以后支持)。
- INTERP 可以与伪列 _irowts 一起使用,返回插值点所对应的时间戳(3.0.2.0版本以后支持)。
- INTERP 可以与伪列 _isfilled 一起使用,显示返回结果是否为原始记录或插值算法产生的数据(3.0.3.0版本以后支持)。
### LAST
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