MaxGekk opened a new pull request #35607:
URL: https://github.com/apache/spark/pull/35607
### What changes were proposed in this pull request?
In the PR, I propose to add new function `TIMESTAMPDIFF` with the following
parameters:
1. `unit` - sthis indicates the units of the difference between the given
timestamps. Supported string values of `unit` are (case insensitive):
- YEAR
- QUARTER
- MONTH
- WEEK
- DAY, DAYOFYEAR
- HOUR
- MINUTE
- SECOND
- MILLISECOND
- MICROSECOND
2. `timestampStart` - A timestamp which the expression subtracts from
`timestampEnd`.
3. `timestampEnd` - A timestamp from which the expression subtracts
`timestampStart`.
### Why are the changes needed?
1. To make the migration process from other systems to Spark SQL easier.
2. To achieve feature parity with other DBMSs.
### Does this PR introduce _any_ user-facing change?
No. This is new feature.
### How was this patch tested?
By running new tests:
```
$ build/sbt "sql/test:testOnly
org.apache.spark.sql.expressions.ExpressionInfoSuite"
$ build/sbt "sql/testOnly *ExpressionsSchemaSuite"
```
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