spill-compression=none crashes with NullPointerException on disk spill

[LuciferYang]

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• I searched in the issues and found no similar issues.

Paimon version

master (1.5-SNAPSHOT)

Compute Engine

Any engine that spills to disk (external sort/merge, or ExternalBuffer under memory pressure).

Minimal reproduce step

1. Set the table option spill-compression = none.
2. Trigger a disk spill (a large external sort or merge, or ExternalBuffer spilling under memory pressure).

What doesn't meet your expectations?

The spill fails with a NullPointerException. spill-compression is a free-form string option (default zstd, no value validation), and none is an intended "no compression" value: BlockCompressionFactory.create deliberately returns null for it. But ChannelWriterOutputView dereferences that factory in its constructor (getCompressor()), and ChannelReaderInputView does the same on read-back (getDecompressor()), so selecting none crashes instead of writing uncompressed blocks.

Anything else?

The SPILL_COMPRESSION option description does not mention none among the supported values, which likely hid this from testing.

Are you willing to submit a PR?

• I'm willing to submit a PR!