comphead commented on code in PR #20059:
URL: https://github.com/apache/datafusion/pull/20059#discussion_r2742533011
##########
datafusion/functions/src/math/floor.rs:
##########
@@ -200,7 +203,242 @@ impl ScalarUDFImpl for FloorFunc {
Interval::make_unbounded(&data_type)
}
+ /// Compute the preimage for floor function.
+ ///
+ /// For `floor(x) = N`, the preimage is `x >= N AND x < N + 1`
+ /// because floor(x) = N for all x in [N, N+1).
+ ///
+ /// This enables predicate pushdown optimizations, transforming:
+ /// `floor(col) = 100` into `col >= 100 AND col < 101`
+ fn preimage(
+ &self,
+ args: &[Expr],
+ lit_expr: &Expr,
+ _info: &SimplifyContext,
+ ) -> Result<PreimageResult> {
+ // floor takes exactly one argument
+ if args.len() != 1 {
Review Comment:
perhaps its good to `debug_assert!` here?
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