[jira] [Commented] (SPARK-40112) Improve the TO_BINARY() function

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-40112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17580517#comment-17580517 ] 

Apache Spark commented on SPARK-40112:
--------------------------------------

User 'vitaliili-db' has created a pull request for this issue:
https://github.com/apache/spark/pull/37483

> Improve the TO_BINARY() function
> --------------------------------
>
>                 Key: SPARK-40112
>                 URL: https://issues.apache.org/jira/browse/SPARK-40112
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: Vitalii Li
>            Priority: Major
>
> Original description SPARK-37507:
> {quote}to_binary(expr, fmt) is a common function available in many other systems to provide a unified entry for string to binary data conversion, where fmt can be utf8, base64, hex and base2 (or whatever the reverse operation to_char()supports).
> [https://docs.aws.amazon.com/redshift/latest/dg/r_TO_VARBYTE.html]
> [https://docs.snowflake.com/en/sql-reference/functions/to_binary.html]
> [https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators#format_string_as_bytes]
> [https://docs.teradata.com/r/kmuOwjp1zEYg98JsB8fu_A/etRo5aTAY9n5fUPjxSEynw]
> Related Spark functions: unbase64, unhex
> {quote}
>  
> Expected improvement:
>  * `base64` behaves more strictly, i.e. does not allow symbols not included in base64 dictionary (A-Za-z0-9+/) and verifies correct padding and symbol groups (see RFC 4648 § 4). Whitespaces are ignored.
>  ** Current implementation allows arbitrary strings and invalid symbols are skipped.
>  * `hex` converts only valid hexadecimal strings and throws errors otherwise. Whitespaces are not allowed.
>  * `utf-8` and `utf8` are interchangeable.
>  * Correct errors are thrown and classified for invalid input (CONVERSION_INVALID_INPUT) and invalid format (CONVERSION_INVALID_FORMAT)



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