dosubot[bot] commented on issue #42679:
URL: https://github.com/apache/superset/issues/42679#issuecomment-5162865435

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   This is a valid gap — the Custom Timestamp filter currently relies entirely 
on `fetchTimeRange(...)` for validation, which only checks whether the 
time-range expression can be parsed/evaluated, not whether start equals end 
[[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/explore/components/controls/DateFilterControl/DateFilterLabel.tsx).
 `CustomFrame.tsx` enforces that relative grain values are positive integers 
but does **no comparison** between `sinceDatetime` and `untilDatetime` 
[[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/explore/components/controls/DateFilterControl/components/CustomFrame.tsx).
   
   The `validTimeRange` flag in `DateFilterLabel.tsx` gates the Apply button 
and could be extended to catch this case 
[[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/explore/components/controls/DateFilterControl/DateFilterLabel.tsx).
 A fix would involve:
   
   1. **`CustomFrame.tsx`** — add a check when both `sinceDatetime` and 
`untilDatetime` are set; if they're equal, surface a validation message like 
*"Start timestamp must be earlier than end timestamp"* 
[[2]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/explore/components/controls/DateFilterControl/components/CustomFrame.tsx).
   2. **`DateFilterLabel.tsx`** — in the debounced validation callback, set 
`validTimeRange = false` and display the error when start equals end, which 
disables Apply 
[[1]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/explore/components/controls/DateFilterControl/DateFilterLabel.tsx).
   3. Optionally, add a helper in **`utils/dateParser.ts`** inside 
`customTimeRangeEncode` to reject equal start/end at the encoding level 
[[3]](https://github.com/apache/superset/blob/829e4d92d91ceae4b43b1ed3b063ffe45377799c/superset-frontend/src/explore/components/controls/DateFilterControl/utils/dateParser.ts).
   
   [PR #42283](https://github.com/apache/superset/pull/42283), which added 
shared validation to reject unparseable `time_range` values, provides a good 
pattern for this kind of change.
   
   
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