Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/14132#discussion_r71823613
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
---
@@ -339,8 +339,11 @@ class AstBuilder extends SqlBaseBaseVisitor[AnyRef]
with Logging {
case SqlBaseParser.SELECT =>
// Regular select
+ // Add hints.
+ val withHint = relation.optionalMap(ctx.hint)(withHints)
--- End diff --
for now the hint can only affect the relations(broadcast hint), so it's ok
to just put the `Hint` on top of relation. But generally hint can affect
anything in the select clause, e.g. maybe the filter condition.
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