manuzhang commented on issue #5706:
URL: https://github.com/apache/iceberg/issues/5706#issuecomment-1244768353
@rdblue It's because `rowFilter == true` in the following function.
```
static boolean dropStats(Expression rowFilter, Collection<String> columns)
{
// Make sure we only drop all stats if we had projected all stats
// We do not drop stats even if we had partially added some stats
columns, except for record_count column.
// Since we don't want to keep stats map which could be huge in size
just because we select record_count, which
// is a primitive type.
if (rowFilter != Expressions.alwaysTrue() && columns != null &&
!columns.containsAll(ManifestReader.ALL_COLUMNS)) {
Set<String> intersection = Sets.intersection(Sets.newHashSet(columns),
STATS_COLUMNS);
return intersection.isEmpty() ||
intersection.equals(Sets.newHashSet("record_count"));
}
return false;
}
```
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