manuzhang commented on code in PR #14593:
URL: https://github.com/apache/iceberg/pull/14593#discussion_r2543906642
##########
api/src/main/java/org/apache/iceberg/expressions/InclusiveMetricsEvaluator.java:
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@@ -327,6 +327,29 @@ public <T> Boolean eq(Bound<T> term, Literal<T> lit) {
public <T> Boolean notEq(Bound<T> term, Literal<T> lit) {
// because the bounds are not necessarily a min or max value, this
cannot be answered using
// them. notEq(col, X) with (X, Y) doesn't guarantee that X is a value
in col.
+ // However, when min == max and the file has no nulls or NaN values, we
can safely prune
+ // if that value equals the literal.
+ int id = term.ref().fieldId();
+ if (mayContainNull(id)) {
+ return ROWS_MIGHT_MATCH;
+ }
+ T lower = lowerBound(term);
+ T upper = upperBound(term);
+
+ if (lower == null || upper == null || NaNUtil.isNaN(lower) ||
NaNUtil.isNaN(upper)) {
+ return ROWS_MIGHT_MATCH;
+ }
+
+ if (nanCounts != null && nanCounts.containsKey(id) && nanCounts.get(id)
!= 0) {
+ return ROWS_MIGHT_MATCH;
+ }
+
+ if (lower.equals(upper)) {
+ int cmp = lit.comparator().compare(lower, lit.value());
Review Comment:
we don't need another local variable here.
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