ianmcook commented on code in PR #43950:
URL: https://github.com/apache/arrow/pull/43950#discussion_r1757028699
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docs/source/format/Columnar.rst:
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@@ -1385,6 +1387,65 @@ have two entries in each RecordBatch. For a RecordBatch
of this schema with
buffer 13: col2 data
+Compression
+-----------
+
+There are three different options for compression of record batch
+body buffers: Buffers can be uncompressed, buffers can be
+compressed with the ``lz4`` compression codec, or buffers can be
+compressed with the ``zstd`` compression codec. Buffers in the
+flat sequence of a message body must be compressed separately using
+the same codec. Specific buffer in the sequence of compressed
+buffers can be left uncompressed in case compression does not yield
+appreciable savings.
Review Comment:
Minor textual suggestion
```suggestion
the same codec. Specific buffers in the sequence of compressed
buffers may be left uncompressed (for example if compressing those
specific buffers would not appreciably reduce their size).
```
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