refactor(properties): Split properties.rs into smaller modules (#14925)

chore: fix the license header check

Signed-off-by: Alan Tang <[email protected]>

datafusion/physical-expr/src/equivalence/mod.rs

@@ -79,6 +79,38 @@ mod tests {
         LexOrdering, PhysicalSortRequirement,
     };
 
+    /// Converts a string to a physical sort expression
+    ///
+    /// # Example
+    /// * `"a"` -> (`"a"`, `SortOptions::default()`)
+    /// * `"a ASC"` -> (`"a"`, `SortOptions { descending: false, nulls_first: false }`)
+    pub fn parse_sort_expr(name: &str, schema: &SchemaRef) -> PhysicalSortExpr {
+        let mut parts = name.split_whitespace();
+        let name = parts.next().expect("empty sort expression");
+        let mut sort_expr = PhysicalSortExpr::new(
+            col(name, schema).expect("invalid column name"),
+            SortOptions::default(),
+        );
+
+        if let Some(options) = parts.next() {
+            sort_expr = match options {
+                "ASC" => sort_expr.asc(),
+                "DESC" => sort_expr.desc(),
+                _ => panic!(
+                    "unknown sort options. Expected 'ASC' or 'DESC', got {}",
+                    options
+                ),
+            }
+        }
+
+        assert!(
+            parts.next().is_none(),
+            "unexpected tokens in column name. Expected 'name' / 'name ASC' / 'name DESC' but got  '{name}'"
+        );
+
+        sort_expr
+    }
+
     pub fn output_schema(
         mapping: &ProjectionMapping,
         input_schema: &Arc<Schema>,