Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/21123#discussion_r183274588
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala
---
@@ -213,6 +215,25 @@ case class DataSourceAnalysis(conf: SQLConf) extends
Rule[LogicalPlan] with Cast
}
}
+/**
+ * Replaces [[FileDataSourceV2]] with [[DataSource]] if parent node is
[[InsertIntoTable]].
+ */
+class FallBackFileDataSourceToV1(sparkSession: SparkSession) extends
Rule[LogicalPlan] {
--- End diff --
Need a little more comments about when this can happen
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