sdf-jkl commented on code in PR #19722:
URL: https://github.com/apache/datafusion/pull/19722#discussion_r2712783862
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datafusion/optimizer/src/simplify_expressions/expr_simplifier.rs:
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@@ -1969,12 +1972,93 @@ impl TreeNodeRewriter for Simplifier<'_> {
}))
}
+ // =======================================
+ // preimage_in_comparison
+ // =======================================
+ //
+ // For case:
+ // date_part('YEAR', expr) op literal
+ //
+ // Background:
+ // Datasources such as Parquet can prune partitions using simple
predicates,
+ // but they cannot do so for complex expressions.
+ // For a complex predicate like `date_part('YEAR', c1) < 2000`,
pruning is not possible.
+ // After rewriting it to `c1 < 2000-01-01`, pruning becomes
feasible.
+ // Rewrites use inclusive lower and exclusive upper bounds when
+ // translating an equality into a range.
+ // NOTE: we only consider immutable UDFs with non Null literal RHS
values and
+ // UDFs that provide both `preimage` and `column_expr`.
Review Comment:
Thanks
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