[GitHub] [spark] MaxGekk opened a new pull request #24342: [SPARK-27438][SQL] Parse strings with timestamps by to_timestamp() in microsecond precision

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MaxGekk opened a new pull request #24342: [SPARK-27438][SQL] Parse strings with timestamps by to_timestamp() in microsecond precision
URL: https://github.com/apache/spark/pull/24342
 
 
   ## What changes were proposed in this pull request?
   
   Add a `downScaleFactor` value to `UnixTime` to control scaling of returned values. Default value of `downScaleFactor` is `1000000` (microseconds per second) which means the result of string parsing in microseconds is divided by `1000000` in `UnixTimestamp` and `ToUnixTimestamp`. The `UnixTime` class is used in `ParseToTimestamp` which sets `downScaleFactor` to 1 as proposed in the PR. In this way, the `ParseToTimestamp` expression and `to_timestamp` function will be able to parse input strings with timestamps in microsecond precision.
   
   ## How was this patch tested?
   
   By `DateFunctionsSuite`, and added new test to the test suite.

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