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Posted to issues@spark.apache.org by "Russell Spitzer (Jira)" <ji...@apache.org> on 2021/10/19 19:40:00 UTC

[jira] [Created] (SPARK-37061) Custom V2 Metrics uses wrong classname in for lookup

Russell Spitzer created SPARK-37061:
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             Summary: Custom V2 Metrics uses wrong classname in for lookup
                 Key: SPARK-37061
                 URL: https://issues.apache.org/jira/browse/SPARK-37061
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: Russell Spitzer


Currently CustomMetrics uses `getCanonicalName` to get the metric type name

https://github.com/apache/spark/blob/38493401d18d42a6cb176bf515536af97ba1338b/sql/core/src/main/scala/org/apache/spark/sql/execution/metric/CustomMetrics.scala#L31-L33

But when using reflection we need to use the original type name.

Here is an example when working with an inner class

```
Class.getName = org.apache.iceberg.spark.source.SparkBatchScan$FilesScannedMetric
Class.getCanonicalName =
org.apache.iceberg.spark.source.SparkBatchScan.FilesScannedMetric
```

The "$" name is required to look up this class while the "." version will fail with CNF.



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