pepijnve commented on code in PR #18625:
URL: https://github.com/apache/datafusion/pull/18625#discussion_r2515559509
##########
datafusion/expr-common/src/interval_arithmetic.rs:
##########
@@ -1738,6 +1738,44 @@ impl From<ScalarValue> for NullableInterval {
}
impl NullableInterval {
+ /// An interval that only contains 'false'.
+ pub const FALSE: Self = NullableInterval::NotNull {
+ values: Interval::CERTAINLY_FALSE,
+ };
+
+ /// An interval that only contains 'true'.
+ pub const TRUE: Self = NullableInterval::NotNull {
+ values: Interval::CERTAINLY_TRUE,
+ };
+
+ /// An interval that only contains 'unknown' (boolean null).
+ pub const UNKNOWN: Self = NullableInterval::Null {
Review Comment:
This little bit from the BNF might also help
```
<boolean test> ::= <boolean primary> [ IS [ NOT ] <truth value> ]
<truth value> ::= TRUE | FALSE | UNKNOWN
```
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