HyukjinKwon commented on a change in pull request #27778: [SPARK-31027] [SQL]
Refactor DataSourceStrategy to be more extendable
URL: https://github.com/apache/spark/pull/27778#discussion_r387442798
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala
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@@ -437,61 +437,76 @@ object DataSourceStrategy {
}
}
+ /**
+ * Find the column name of an expression that can be pushed down.
+ */
+ private[sql] def pushDownColName(e: Expression): Option[String] = {
Review comment:
I understand `private[sql]` can scope explicitly which makes sense in a way.
However, the current decision was made across the codebase as of SPARK-16964
which also makes sense. What about sticking to one existing way as the current
codebase does, and changing it globally later if this is found problematic?
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