viirya commented on a change in pull request #31966:
URL: https://github.com/apache/spark/pull/31966#discussion_r613824235
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File path:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/SchemaPruningSuite.scala
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@@ -351,6 +351,41 @@ abstract class SchemaPruningSuite
}
}
+ testSchemaPruning("SPARK-34638: nested column prune on generator output") {
+ val query1 = spark.table("contacts")
+ .select(explode(col("friends")).as("friend"))
Review comment:
Oh, because in the lambda function you access `friends`, Spark cannot
prune it.
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