Sagnik Chakraborty created ARROW-9501:
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Summary: [C++][Gandiva] Add logic in timestampdiff() when end date
is last day of a month
Key: ARROW-9501
URL: https://issues.apache.org/jira/browse/ARROW-9501
Project: Apache Arrow
Issue Type: Task
Reporter: Sagnik Chakraborty
{{timestampdiff}}(*month*, _startDate_, _endDate_) returns wrong result in
Gandiva when the _endDate_ < _startDate_ and _endDate_ is the last day of the
month. An additional month is said to have passed when the end day is greater
than or equal to the start day, but this does not hold true for dates which are
last days of the month.
Case in point, if _startDate_ = *2020-01-31*, _endDate_ = *2020-02-29*,
previously {{timestampdiff}}() returned *0*, but the correct result should be
*1*.
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