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https://issues.apache.org/jira/browse/SPARK-43815?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Richard Yu updated SPARK-43815:
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Description:
We want to add support for the follow functions:
* to_varchar() as an alias for to_char()
* Expand to_char() to take date, timestamp and binary expression as the first
argument. For date and timestamp expression, the function will be equivalent to
date_format(expr, fmt) . For binary expression, the function will be equivalent
to base64() , hex(), and decode(<expr>, 'UTF-8') for fmt base64, hex, and UTF-8
respectively.
* timediff() as an alias for timestampdiff()
was:
Today, users who have SQL engines which support ```to_varchar``` needs to
change such function invocations to ```to_char``` when migrating to Apache
Spark. To help minimize the amount of changes which users need to make, we
introduce a ```to_varchar``` function alias for ```to_char```. Additionally, we
extend ```to_char()``` such that when the first argument of the function is:
* date or timestamp: ```to_char``` is equivalent to ```date_format(expr,
format)```
* base64: equivalent to ```base64()```
* hex: equivalent to ```hex()```
* UTF-8: equivalent to ```decode(<expr>, 'UTF-8')```
Additioally, we add support for the ```timediff``` alias for
```timestampdiff```.
> Add SQL functions to_varchar and extend to_char functionality
> -------------------------------------------------------------
>
> Key: SPARK-43815
> URL: https://issues.apache.org/jira/browse/SPARK-43815
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 3.4.1
> Reporter: Richard Yu
> Priority: Major
>
> We want to add support for the follow functions:
> * to_varchar() as an alias for to_char()
> * Expand to_char() to take date, timestamp and binary expression as the
> first argument. For date and timestamp expression, the function will be
> equivalent to date_format(expr, fmt) . For binary expression, the function
> will be equivalent to base64() , hex(), and decode(<expr>, 'UTF-8') for fmt
> base64, hex, and UTF-8 respectively.
> * timediff() as an alias for timestampdiff()
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