mbutrovich opened a new pull request, #1697:
URL: https://github.com/apache/datafusion-comet/pull/1697
## Which issue does this PR close?
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Closes #.
## Rationale for this change
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Spark SQL's `decode` with two arguments converts a binary column to a string
given an encoding from one of 'US-ASCII', 'ISO-8859-1', 'UTF-8', 'UTF-16BE',
'UTF-16LE', 'UTF-16'.
https://github.com/apache/spark/blob/ef336ad51ba62e64a77896b9da12791051fa92cb/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala#L3028.
Comet currently has no support for this expression, and this PR adds 'UTF-8'
support.
## What changes are included in this PR?
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Convert a `StringDecode` expression to a `Cast` but only for the 'UTF-8'
case. This scenario maps nicely to an Arrow cast with the safe option to
replace invalid values with nulls:
https://github.com/apache/arrow-rs/blob/07093a49eface9be9208dd427b810abba8d0a755/arrow-cast/src/cast/string.rs#L342
Other encodings are currently unsupported, however 'US-ASCII' might be easy
to convert into the `ascii` scalar function. I need to confirm that the
semantics match.
## How are these changes tested?
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New fuzz test and existing Spark SQL tests.
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