maropu commented on a change in pull request #28672: URL: https://github.com/apache/spark/pull/28672#discussion_r432283859
########## File path: docs/sql-ref-syntax-qry-select-hints.md ########## @@ -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` `` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org