Github user nongli commented on a diff in the pull request:
https://github.com/apache/spark/pull/11740#discussion_r56436213
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/codegen/CodeGenerator.scala
---
@@ -78,6 +78,14 @@ class CodegenContext {
var currentVars: Seq[ExprCode] = null
/**
+ * Whether should we copy the result rows or not.
+ *
+ * If any operator inside WholeStageCodegen generate multiple rows from
a single row (for
+ * example, Join), this should be true.
+ */
--- End diff --
I think it's worth nothing that operators which start new pipelines should
reset this to false.
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