[PR] [core] Support spill-compression none in channel views [paimon]

["LuciferYang (via GitHub)" <gi...@apache.org>]

LuciferYang opened a new pull request, #10276:
URL: https://github.com/apache/paimon/pull/10276

   ### Purpose
   
   `spill-compression` is a free-form string option (default `zstd`, no value validation), and `none` is an intended "no compression" value: `BlockCompressionFactory.create` returns `null` for it. On master that null factory is dereferenced in the `ChannelWriterOutputView` constructor (`getCompressor()`) and, on read-back, in `ChannelReaderInputView` (`getDecompressor()`), so setting `spill-compression = none` crashes any disk spill (external sort/merge, or `ExternalBuffer` under memory pressure) with a `NullPointerException`.
   
   This makes both channel views write and read plain uncompressed blocks when the compression factory is null, so `none` produces an uncompressed spill that round-trips correctly. The compressed paths (zstd, lz4, and the rest) are unchanged.
   
   This closes #10275.
   
   ### Tests
   
   - `ChannelWriterOutputViewTest#testSpillCompressionNoneRoundTrip` pins that a spill written and read back with compression `none` round-trips. Without the fix the write-view constructor throws `NullPointerException`.
   
   ### API and Format
   
   No.
   
   ### Documentation
   
   No.
   


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Re: [PR] [core] Support spill-compression none in channel views [paimon]

["LuciferYang (via GitHub)" <gi...@apache.org>]

LuciferYang closed pull request #10276: [core] Support spill-compression none in channel views
URL: https://github.com/apache/paimon/pull/10276


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