1 files changed, 13 insertions, 0 deletions
diff --git a/vendor/datafrog/src/map.rs b/vendor/datafrog/src/map.rs
new file mode 100644
index 000000000..1a8c10128
--- /dev/null
+++ b/vendor/datafrog/src/map.rs
@@ -0,0 +1,13 @@
+//! Map functionality.
+
+use super::{Relation, Variable};
+
+pub(crate) fn map_into<T1: Ord, T2: Ord>(
+    input: &Variable<T1>,
+    output: &Variable<T2>,
+    logic: impl FnMut(&T1) -> T2,
+) {
+    let results: Vec<T2> = input.recent.borrow().iter().map(logic).collect();
+
+    output.insert(Relation::from_vec(results));
+}