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docs: Time-Series Extensions - added pseudocolumns 

Added the _wstart, _wend, and _wduration pseudocolumns to the documentation.
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Sean Ely 2022-08-22 14:13:58 -07:00 committed by GitHub
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docs/en/12-taos-sql/12-distinguished.md
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@ -58,6 +58,15 @@ The following restrictions apply:
- The window clause cannot be used with a GROUP BY clause.
- `WHERE` clause can be used to specify the starting and ending time and other filter conditions
### Window Pseudocolumns
**\_WSTART, \_WEND, and \_WDURATION**
The \_WSTART, \_WEND, and \_WDURATION pseudocolumns indicate the beginning, end, and duration of a window.
These pseudocolumns occur after the aggregation clause.
### FILL Clause
`FILL` clause is used to specify how to fill when there is data missing in any window, including: