Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/14132#discussion_r71625297
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/catalyst/SQLBuilder.scala ---
@@ -356,8 +372,14 @@ class SQLBuilder(logicalPlan: LogicalPlan) extends
Logging {
}
}
+ val broadcastHint = project match {
+ case p @ Project(projectList, Hint("BROADCAST", tables, child)) =>
+ if (tables.nonEmpty) s"/*+ MAPJOIN(${tables.mkString(", ")}) */"
else ""
+ case _ => ""
+ }
build(
"SELECT",
+ broadcastHint,
--- End diff --
Just did a quick check. Except `groupingSetToSQL`, the other nodes are not
converting the `Project` operator to SQL. That is the reason why we have to add
a special handling for `BroadcastHint`. Then, maybe we can add an extra dummy
`Project` in `groupingSetToSQL`. If so, we can avoid adding the special
handling for `BroadcastHint`
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