rdblue commented on code in PR #8803:
URL: https://github.com/apache/iceberg/pull/8803#discussion_r1375315072
##########
core/src/main/java/org/apache/iceberg/GenericDataFile.java:
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@@ -66,23 +68,31 @@ class GenericDataFile extends BaseFile<DataFile> implements
DataFile {
* Copy constructor.
*
* @param toCopy a generic data file to copy.
- * @param fullCopy whether to copy all fields or to drop column-level stats
+ * @param copyStats whether to copy all fields or to drop column-level stats.
+ * @param columnsToKeepStats a set of column ids to keep stats. If empty or
<code>null</code> then
+ * every column stat is kept.
*/
- private GenericDataFile(GenericDataFile toCopy, boolean fullCopy) {
- super(toCopy, fullCopy);
+ private GenericDataFile(
+ GenericDataFile toCopy, boolean copyStats, Set<Integer>
columnsToKeepStats) {
+ super(toCopy, copyStats, columnsToKeepStats);
}
/** Constructor for Java serialization. */
GenericDataFile() {}
@Override
public DataFile copyWithoutStats() {
- return new GenericDataFile(this, false /* drop stats */);
+ return new GenericDataFile(this, false /* drop stats */,
ImmutableSet.of());
+ }
+
+ @Override
+ public DataFile copyWithStats(Set<Integer> columnsToKeepStats) {
+ return new GenericDataFile(this, true, columnsToKeepStats);
}
@Override
public DataFile copy() {
- return new GenericDataFile(this, true /* full copy */);
+ return new GenericDataFile(this, true /* full copy */, ImmutableSet.of());
Review Comment:
Why does this pass an empty set for a full copy? Those two things conflict
with one another. If you intend to allow not passing a set of column IDs (which
is a good idea) then pass a default that makes sense to turn off the filter,
like `null`.
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