rionmonster commented on code in PR #29565:
URL: https://github.com/apache/flink/pull/29565#discussion_r4351854608
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docs/content/docs/sql/reference/queries/joins.md:
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@@ -464,7 +464,7 @@ They are reported under the operator's [metric group]({{<
ref "docs/ops/metrics"
| `maxJoinFanOut` | Gauge | The largest number of joined rows emitted for a
single probe-side row.
|
| `avgJoinFanOut` | Gauge | The average number of joined rows emitted per
probe-side row.
|
| `numUnmatchedProbeRecords` | Counter | The number of probe-side rows that
found no build-side match. For an `INNER JOIN` these produce no output; for a
`LEFT JOIN` they are emitted null-padded.
|
-| `numUnmatchedBuildRetractions` | Counter | The number of build-side
retractions (`-U`/`-D`) for a row that was not present in state.
|
+| `numUnmatchedBuildRetractions` | Counter | The number of build-side
retractions (`-U`/`-D`) for a row that was not present in state. Retractions of
rows whose join key can never match, because a key field that is not compared
null-safely is `NULL`, are not counted, since such rows are not stored. |
Review Comment:
I've applied these docs-related changes as well!
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