Spark: Add read/write support for UUIDs from bytes

[raphaelauv]

Apache Iceberg version

1.5.2 (latest release)

Query engine

Spark

Please describe the bug 🐞

I can insert a string column to an iceberg UUID column thanks to #7399

df = df.withColumn("id", lit(str(uuid.uuid4())))

but I can't insert a byte column to an iceberg UUID column

df = df.withColumn("id", lit(uuid.uuid4().bytes))

thanks all

[nastra]

@raphaelauv would you be interested in contributing a fix for this?

[raphaelauv]

hey @nastra, I do not have the time to contribute this feature right now, thanks for the proposition 👍

until , I'm sharring an hacky bypass 😅 :

df = df.withColumn(
    "id", 
    F.regexp_replace(
        F.lower(F.hex("id")), 
        "(.{8})(.{4})(.{4})(.{4})(.{12})", 
        "$1-$2-$3-$4-$5"
    )
)

[anuragmantri]

I can give this a shot @nastra. Although I need to read the UUID PR first.