yyanyy commented on a change in pull request #1747:
URL: https://github.com/apache/iceberg/pull/1747#discussion_r521837973
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File path: api/src/main/java/org/apache/iceberg/expressions/Expressions.java
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@@ -123,6 +123,22 @@ public static Expression not(Expression child) {
return new UnboundPredicate<>(Expression.Operation.NOT_NULL, expr);
}
+ public static <T> UnboundPredicate<T> isNaN(String name) {
+ return new UnboundPredicate<>(Expression.Operation.IS_NAN, ref(name));
+ }
+
+ public static <T> UnboundPredicate<T> isNaN(UnboundTerm<T> expr) {
+ return new UnboundPredicate<>(Expression.Operation.IS_NAN, expr);
+ }
+
+ public static <T> UnboundPredicate<T> notNaN(String name) {
+ return new UnboundPredicate<>(Expression.Operation.NOT_NAN, ref(name));
+ }
+
+ public static <T> UnboundPredicate<T> notNaN(UnboundTerm<T> expr) {
+ return new UnboundPredicate<>(Expression.Operation.NOT_NAN, expr);
+ }
Review comment:
I originally thought to update `SparkFilters` to do the rewrite, but
this is a much better place. Thanks for the suggestion!
Edit: what do you think about doing rewriting `eq` within
`UnboundPredicate`? And for rewriting `in`, I was thinking to let
`Expressions.in` to return `Expression` instead of `Predicate` to let the
rewrite logic of `or(isNaN, in)`/`and(notNaN, notIn)` happen; does that align
with your thinking?
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