findepi commented on code in PR #13260:
URL: https://github.com/apache/datafusion/pull/13260#discussion_r1831797615
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datafusion/optimizer/src/simplify_expressions/expr_simplifier.rs:
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@@ -3633,32 +3697,123 @@ mod tests {
#[test]
fn test_like_and_ilke() {
- // LIKE '%'
- let expr = like(col("c1"), "%");
+ let null = lit(ScalarValue::Utf8(None));
+
+ // expr [NOT] [I]LIKE NULL
+ let expr = like(col("c1"), null.clone());
+ assert_eq!(simplify(expr), lit_bool_null());
+
+ let expr = not_like(col("c1"), null.clone());
+ assert_eq!(simplify(expr), lit_bool_null());
+
+ let expr = ilike(col("c1"), null.clone());
+ assert_eq!(simplify(expr), lit_bool_null());
+
+ let expr = not_ilike(col("c1"), null.clone());
+ assert_eq!(simplify(expr), lit_bool_null());
+
+ // expr [NOT] [I]LIKE '%'
+ let expr = like(col("c1"), lit("%"));
+ assert_eq!(simplify(expr), if_not_null(col("c1"), true));
+
+ let expr = not_like(col("c1"), lit("%"));
+ assert_eq!(simplify(expr), if_not_null(col("c1"), false));
+
+ let expr = ilike(col("c1"), lit("%"));
+ assert_eq!(simplify(expr), if_not_null(col("c1"), true));
+
+ let expr = not_ilike(col("c1"), lit("%"));
+ assert_eq!(simplify(expr), if_not_null(col("c1"), false));
+
+ // expr [NOT] [I]LIKE '%%'
Review Comment:
> In Postgres, `%%` doesn't mean matching the actual literal '%'. The escape
character is `\`.
thanks @goldmedal for checking this.
in our case, we don't have default escape character at all, i believe.
at least we don't define it on Like object.
i need to check whether we have an _implicit_ default escape character
applied somewhere later.
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