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
and ensure we can cover all the possible query plans? Includes negative and
positive cases.
Also, we need to have the unit test cases for these optimizer rules.
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