yyanyy commented on a change in pull request #1872:
URL: https://github.com/apache/iceberg/pull/1872#discussion_r570609722
##########
File path:
api/src/main/java/org/apache/iceberg/expressions/ManifestEvaluator.java
##########
@@ -144,18 +143,37 @@ public Boolean or(Boolean leftResult, Boolean
rightResult) {
@Override
public <T> Boolean isNaN(BoundReference<T> ref) {
int pos = Accessors.toPosition(ref.accessor());
- // containsNull encodes whether at least one partition value is null,
lowerBound is null if
- // all partition values are null.
- if (stats.get(pos).containsNull() && stats.get(pos).lowerBound() ==
null) {
- return ROWS_CANNOT_MATCH; // all values are null
+
+ if (stats.get(pos).containsNaN() != null &&
!stats.get(pos).containsNaN()) {
+ return ROWS_CANNOT_MATCH;
+ }
+
+ if (allValuesAreNull(stats.get(pos))) {
+ return ROWS_CANNOT_MATCH;
}
return ROWS_MIGHT_MATCH;
}
+ private boolean allValuesAreNull(PartitionFieldSummary summary) {
+ // Before introducing containsNaN field, containsNull encodes whether at
least one partition value is null,
+ // lowerBound is null if all partition values are null.
+ // After introducing containsNaN field, containsNaN must be false to
ensure all values are null since bounds
+ // don't include NaN anymore.
+ return summary.containsNull() && summary.lowerBound() == null &&
+ (summary.containsNaN() == null || !summary.containsNaN());
Review comment:
I think the change for excluding NaN in `lower`/`upper` and adding
`containsNaN` both belong to this PR, so if a release contains this change,
then it would either be (1) `NaN` is part of `lower`/`upper` and `containsNaN`
is missing, or (2) `containsNaN` exists and `lower`/`upper` doesn't store
`NaN`. But I guess people may implement their own manifest summary that already
exclude `NaN` from bounds but no `containsNaN`, so we still want to handle
this, and file level metrics could give more granular information so there
isn't necessarily any performance penalty. I have updated this PR to check for
existence of `containsNaN`, but please let me know if my understanding isn't
correct!
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