alamb commented on code in PR #14119:
URL: https://github.com/apache/datafusion/pull/14119#discussion_r1925978743
##########
datafusion/functions/src/string/starts_with.rs:
##########
@@ -98,6 +99,48 @@ impl ScalarUDFImpl for StartsWithFunc {
}
}
+ fn simplify(
+ &self,
+ args: Vec<Expr>,
+ _info: &dyn SimplifyInfo,
+ ) -> Result<ExprSimplifyResult> {
+ if let Expr::Literal(scalar_value) = &args[1] {
+ // Convert starts_with(col, 'prefix') to col LIKE 'prefix%' with
proper escaping
Review Comment:
I double checked the escaping logic and I think this looks good to me.
##########
datafusion/sqllogictest/test_files/string/string_view.slt:
##########
@@ -344,7 +344,7 @@ EXPLAIN SELECT
FROM test;
----
logical_plan
-01)Projection: starts_with(test.column1_utf8view, Utf8View("äöüß")) AS c1,
starts_with(test.column1_utf8view, Utf8View("")) AS c2,
starts_with(test.column1_utf8view, Utf8View(NULL)) AS c3,
starts_with(Utf8View(NULL), test.column1_utf8view) AS c4
+01)Projection: test.column1_utf8view LIKE Utf8View("äöüß%") AS c1, CASE
test.column1_utf8view IS NOT NULL WHEN Boolean(true) THEN Boolean(true) END AS
c2, starts_with(test.column1_utf8view, Utf8View(NULL)) AS c3,
starts_with(Utf8View(NULL), test.column1_utf8view) AS c4
Review Comment:
this is actually pretty cool -- it figured out that
`STARTS_WITH(column1_utf8view, '') as c2,` is true if `column1_utf8view` is NOT
NULL
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