flyrain commented on code in PR #4588:
URL: https://github.com/apache/iceberg/pull/4588#discussion_r950762704
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spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/data/vectorized/ColumnarBatchReader.java:
##########
@@ -183,6 +187,8 @@ Pair<int[], Integer>
buildPosDelRowIdMapping(PositionDeleteIndex deletedRowPosit
currentRowId++;
} else if (hasIsDeletedColumn) {
isDeleted[originalRowId] = true;
+ } else {
+ deletes.incrementDeleteCount();
}
Review Comment:
It is triggered by either projection or filtering. Here are two examples:
```
select name, _deleted from student
```
It returns both deleted and un-delete rows.
```
select name from student where _deleted=true
```
It returns deleted rows.
The way I saw it is that the delete count metric is orthogonal to the
metadata column `_deleted`. It reports how many row-level deletes applied as
its label indicates, `public static final String DISPLAY_STRING = "number of
row deletes applied"`. I don’t have strong option on it though. What do you
think? BTW, the non-vectorized read also didn’t report the metric in case of
`_deleted` column, see line 255 in class `DeleteFilter`.
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