implement map_agg

Author: LiaCastaneda

datafusion/functions-aggregate/src/lib.rs

@@ -79,6 +79,7 @@ pub mod covariance;
 pub mod first_last;
 pub mod grouping;
 pub mod hyperloglog;
+pub mod map_agg;
 pub mod median;
 pub mod min_max;
 pub mod nth_value;
@@ -122,6 +123,7 @@ pub mod expr_fn {
     pub use super::first_last::first_value;
     pub use super::first_last::last_value;
     pub use super::grouping::grouping;
+    pub use super::map_agg::map_agg;
     pub use super::median::median;
     pub use super::min_max::max;
     pub use super::min_max::min;
@@ -156,6 +158,7 @@ pub fn all_default_aggregate_functions() -> Vec<Arc<AggregateUDF>> {
         sum::sum_udaf(),
         min_max::max_udaf(),
         min_max::min_udaf(),
+        map_agg::map_agg_udaf(),
         median::median_udaf(),
         count::count_udaf(),
         regr::regr_slope_udaf(),