Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/21911#discussion_r206741178
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -332,7 +332,7 @@ resource
;
queryNoWith
- : insertInto? queryTerm queryOrganization
#singleInsertQuery
+ : (insertInto (hints+=hint)*)? queryTerm queryOrganization
#singleInsertQuery
--- End diff --
Why allow more than one coalesce hint? Is this useful in some way?
I think it is confusing to users to allow multiple hints because the order
in which they are applied to the plan isn't clear. Is it left-to-right order?
Would `REPARTITION(100), COALESCE(10)` repartition and then coalesce?
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