alamb commented on code in PR #10510:
URL: https://github.com/apache/datafusion/pull/10510#discussion_r1602121592


##########
datafusion/expr/src/interval_arithmetic.rs:
##########
@@ -1469,6 +1472,8 @@ pub enum NullableInterval {
     MaybeNull { values: Interval },
     /// The value is definitely not null, and is within the specified range.
     NotNull { values: Interval },
+    /// Added to handle cases with insufficient statistics
+    Unknown,
 }

Review Comment:
   > What I saw is that sometimes ColumnStatistics { ..., min, max, ... } both 
are equal to Precision::Absent. In such cases, we can't determine the type for 
Interval.
   
   Anywhere we have `ColumnStatistics` we should  also have the schema (and 
thus the `DataType` of all columns) -- maybe we just have to pass the schema 
along with the statistics?



##########
datafusion/expr/src/interval_arithmetic.rs:
##########
@@ -1469,6 +1472,8 @@ pub enum NullableInterval {
     MaybeNull { values: Interval },
     /// The value is definitely not null, and is within the specified range.
     NotNull { values: Interval },
+    /// Added to handle cases with insufficient statistics

Review Comment:
   ```suggestion
       /// No information is known about this intervals values or nullness
   ```



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