alia Can't insert blob as map value

For some reason a byte array can't be serialized if it's in a map. I added a failing test to show this https://github.com/nivekuil/alia/commit/3b4973711be79df5f62f15be2aa79bdda2f83f60 which throws an exception Caused by: com.datastax.oss.driver.api.core.type.codec.CodecNotFoundException: Codec not found for requested operation: [BLOB <-> [B]

Sep 18 '22 06:09 nivekuil

same for vector/List, looking into it I found some leads:

https://github.com/datastax/java-driver/pull/1555 https://github.com/datastax/spark-cassandra-connector/pull/1334

Feb 27 '23 23:02 nivekuil

From the first link, I figured out a workaround

If you are looking for a BLOB codec, the right call is CachingCodecRegistry.codecFor(DataType.BLOB, ByteBuffer.class). Indeed, there is a default BLOB codec registered in the driver that converts BLOB columns to ByteBuffer objects.

But, as explained in the docs, this method does not accept covariant classes. So if you try, say, CachingCodecRegistry.codecFor(DataType.BLOB, HeapByteBuffer.class) – then the method will throw CodecNotFoundException – even if HeapByteBuffer is a subtype of ByteBuffer.

This is probably not the right way to fix it, but this unblocks me for now https://github.com/mpenet/alia/commit/df69e5034c06ba90f489360bd039fecfed18f516

Feb 27 '23 23:02 nivekuil