Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/11768#discussion_r56408062
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/SQLBuilder.scala ---
@@ -333,6 +360,9 @@ class SQLBuilder(logicalPlan: LogicalPlan, sqlContext:
SQLContext) extends Loggi
// operators on top of a table relation, merge the sample
information into `SQLTable` of
// that table relation, as we can only convert table sample to
standard SQL string.
ResolveSQLTable,
+ // Re-order operators to let them generate legal SQL string, e.g.
we should push down
+ // `Generate` through `Filter`. We should enrich this rule in the
future.
--- End diff --
Can you explain what you mean on "We should enrich this rule in the
future."?
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