andygrove commented on issue #914:
URL:
https://github.com/apache/datafusion-comet/issues/914#issuecomment-2331803689
The decode metric is computed in
`org.apache.comet.parquet.BatchReader#nextBatch(int)`:
```scala
public boolean nextBatch(int batchSize) {
long totalDecodeTime = 0, totalLoadTime = 0;
for (int i = 0; i < columnReaders.length; i++) {
AbstractColumnReader reader = columnReaders[i];
long startNs = System.nanoTime();
reader.readBatch(batchSize);
totalDecodeTime += System.nanoTime() - startNs;
```
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