maropu commented on a change in pull request #28672:
URL: https://github.com/apache/spark/pull/28672#discussion_r432283859
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File path: docs/sql-ref-syntax-qry-select-hints.md
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@@ -21,14 +21,45 @@ license: |
### Description
-Join Hints allow users to suggest the join strategy that Spark should use.
Prior to Spark 3.0, only the `BROADCAST` Join Hint was supported. `MERGE`,
`SHUFFLE_HASH` and `SHUFFLE_REPLICATE_NL` Joint Hints support was added in 3.0.
When different join strategy hints are specified on both sides of a join, Spark
prioritizes hints in the following order: `BROADCAST` over `MERGE` over
`SHUFFLE_HASH` over `SHUFFLE_REPLICATE_NL`. When both sides are specified with
the `BROADCAST` hint or the `SHUFFLE_HASH` hint, Spark will pick the build side
based on the join type and the sizes of the relations. Since a given strategy
may not support all join types, Spark is not guaranteed to use the join
strategy suggested by the hint.
+Hints give users a way to suggest how Spark SQL to use specific approaches to
generate its execution plan.
### Syntax
```sql
-/*+ join_hint [ , ... ] */
+/*+ hint [ , ... ] */
+```
+
+### Coalesce/Repartition/Repartition_By_Range Hints
+
+Coalesce/Repartition/Repartition_By_Range hints have functionalities
equivalent to those of the
Review comment:
Could you follow the same format with the Join hints? e.g., `Coalesce`
-> `` `COALESCE` ``
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