gatorsmile commented on a change in pull request #27503: [SPARK-30761]SQL]
Nested column pruning should not prune on required child outputs in Generate
URL: https://github.com/apache/spark/pull/27503#discussion_r376755585
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File path:
sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/SchemaPruningSuite.scala
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@@ -333,6 +333,14 @@ abstract class SchemaPruningSuite
}
}
+ testSchemaPruning("select explode of nested field of array of struct and " +
+ "all remaining nested fields") {
Review comment:
Instead of fixing case by case, can we try to find all the possible cases?
Also, we need to have the unit test cases for these optimizer rules.
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