asdf2014 commented on code in PR #16863:
URL: https://github.com/apache/druid/pull/16863#discussion_r1716605178
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docs/ingestion/ingestion-spec.md:
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@@ -520,6 +520,7 @@ For information on defining an `indexSpec` in a query
context, see [SQL-based in
|stringDictionaryEncoding|Encoding format for string value dictionaries used
by STRING and [COMPLEX<json>](../querying/nested-columns.md) columns. To
enable front coding, set `stringDictionaryEncoding.type` to `frontCoded`.
Optionally, you can specify the `bucketSize` and `formatVersion` properties.
See [Front coding](#front-coding) for more information.|`{"type":"utf8"}`|
|metricCompression|Compression format for primitive type metric columns.
Options are `lz4`, `lzf`, `zstd`, `uncompressed`, or `none` (which is more
efficient than `uncompressed`, but not supported by older versions of
Druid).|`lz4`|
|longEncoding|Encoding format for long-typed columns. Applies regardless of
whether they are dimensions or metrics. Options are `auto` or `longs`. `auto`
encodes the values using offset or lookup table depending on column
cardinality, and store them with variable size. `longs` stores the value as-is
with 8 bytes each.|`longs`|
+|complexMetricCompression|Compression format for complex type metric columns.
Options are `lz4`, `lzf`, `zstd`, `uncompressed`. Options other than
`uncompressed` not compatible with Druid versions older than 31, and only
applies to complex metrics which do not have their own specialized column
formats.|`uncompressed`|
Review Comment:
```suggestion
|complexMetricCompression|Compression format for complex type metric
columns. Options are `lz4`, `lzf`, `zstd`, `uncompressed`. Options other than
`uncompressed` are not compatible with Druid versions older than 31, and only
applies to complex metrics which do not have their own specialized column
formats.|`uncompressed`|
```
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