alamb commented on code in PR #8377:
URL: https://github.com/apache/arrow-datafusion/pull/8377#discussion_r1411179490
##########
datafusion-examples/examples/expr_api.rs:
##########
@@ -120,6 +171,64 @@ fn simplify_demo() -> Result<()> {
col("i").lt(lit(10))
);
+ // String --> Date simplification
+ // `cast('2020-09-01' as date)` --> 18500
+ assert_eq!(
+ simplifier.simplify(lit("2020-09-01").cast_to(&DataType::Date32,
&schema)?)?,
+ lit(ScalarValue::Date32(Some(18506)))
+ );
+
+ Ok(())
+}
+
+/// DataFusion also has APIs for analyzing predicates (boolean expressions) to
+/// determine any ranges restrictions on the inputs required for the predicate
+/// evaluate to true.
+fn range_analysis_demo() -> Result<()> {
Review Comment:
This is a really powerful feature of DataFusion and I don't think it is
widely understood yet
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