jayzhan211 commented on code in PR #9980:
URL: https://github.com/apache/arrow-datafusion/pull/9980#discussion_r1554813577
##########
datafusion/functions-array/src/lib.rs:
##########
@@ -98,54 +103,245 @@ pub mod expr_fn {
pub use super::string::string_to_array;
}
+
+
+pub type ScalarFactory = Box<dyn Fn() -> Arc<ScalarUDF> + Send + Sync>;
+
+/// HashMap Singleton for UDFs
+///
+/// Replace register_all with our built-in functions
+/// Replace scalar_functions: HashMap<String, Arc<ScalarUDF>> in SessionState
+pub fn array_functions() -> &'static Mutex<HashMap<String, ScalarFactory>> {
+ static FUNCTIONS: OnceLock<Mutex<HashMap<String, ScalarFactory>>> =
OnceLock::new();
+ FUNCTIONS.get_or_init(|| {
+ let mut functions = HashMap::new();
+ functions.insert(
+ String::from("array_to_string"),
+ Box::new(string::array_to_string_udf) as _,
+ );
+ functions.insert(
+ String::from("string_to_array"),
+ Box::new(string::string_to_array_udf) as _,
+ );
+ functions.insert(String::from("range"), Box::new(range::range_udf) as
_);
+ functions.insert(
+ String::from("gen_series"),
+ Box::new(range::gen_series_udf) as _,
+ );
+ functions.insert(
+ String::from("array_dims"),
+ Box::new(dimension::array_dims_udf) as _,
+ );
+ functions.insert(
+ String::from("cardinality"),
+ Box::new(cardinality::cardinality_udf) as _,
+ );
+ functions.insert(
+ String::from("array_ndims"),
+ Box::new(dimension::array_ndims_udf) as _,
+ );
+ functions.insert(
+ String::from("array_append"),
+ Box::new(concat::array_append_udf) as _,
+ );
+ functions.insert(
+ String::from("array_prepend"),
+ Box::new(concat::array_prepend_udf) as _,
+ );
+ functions.insert(
+ String::from("array_concat"),
+ Box::new(concat::array_concat_udf) as _,
+ );
+ functions.insert(
+ String::from("array_except"),
+ Box::new(except::array_except_udf) as _,
+ );
+ functions.insert(
+ String::from("array_element"),
+ Box::new(extract::array_element_udf) as _,
+ );
+ functions.insert(
+ String::from("array_pop_back"),
+ Box::new(extract::array_pop_back_udf) as _,
+ );
+ functions.insert(
+ String::from("array_pop_front"),
+ Box::new(extract::array_pop_front_udf) as _,
+ );
+ functions.insert(
+ String::from("array_slice"),
+ Box::new(extract::array_slice_udf) as _,
+ );
+ functions.insert(
+ String::from("make_array"),
+ Box::new(make_array::make_array_udf) as _,
+ );
+ functions.insert(
+ String::from("array_has"),
+ Box::new(array_has::array_has_udf) as _,
+ );
+ functions.insert(
+ String::from("array_has_all"),
+ Box::new(array_has::array_has_all_udf) as _,
+ );
+ functions.insert(
+ String::from("array_has_any"),
+ Box::new(array_has::array_has_any_udf) as _,
+ );
+ functions.insert(
+ String::from("array_empty"),
+ Box::new(empty::array_empty_udf) as _,
+ );
+ functions.insert(
+ String::from("array_length"),
+ Box::new(length::array_length_udf) as _,
+ );
+ functions.insert(
+ String::from("flatten"),
+ Box::new(flatten::flatten_udf) as _,
+ );
+ functions.insert(
+ String::from("array_sort"),
+ Box::new(sort::array_sort_udf) as _,
+ );
+ functions.insert(
+ String::from("array_repeat"),
+ Box::new(repeat::array_repeat_udf) as _,
+ );
+ functions.insert(
+ String::from("array_resize"),
+ Box::new(resize::array_resize_udf) as _,
+ );
+ functions.insert(
+ String::from("array_reverse"),
+ Box::new(reverse::array_reverse_udf) as _,
+ );
+ functions.insert(
+ String::from("array_distinct"),
+ Box::new(set_ops::array_distinct_udf) as _,
+ );
+ functions.insert(
+ String::from("array_intersect"),
+ Box::new(set_ops::array_intersect_udf) as _,
+ );
+ functions.insert(
+ String::from("array_union"),
+ Box::new(set_ops::array_union_udf) as _,
+ );
+ functions.insert(
+ String::from("array_position"),
+ Box::new(position::array_position_udf) as _,
+ );
+ functions.insert(
+ String::from("array_positions"),
+ Box::new(position::array_positions_udf) as _,
+ );
+ functions.insert(
+ String::from("array_remove"),
+ Box::new(remove::array_remove_udf) as _,
+ );
+ functions.insert(
+ String::from("array_remove_all"),
+ Box::new(remove::array_remove_all_udf) as _,
+ );
+ functions.insert(
+ String::from("array_remove_n"),
+ Box::new(remove::array_remove_n_udf) as _,
+ );
+ functions.insert(
+ String::from("array_replace"),
+ Box::new(replace::array_replace_udf) as _,
+ );
+ functions.insert(
+ String::from("array_replace_all"),
+ Box::new(replace::array_replace_all_udf) as _,
+ );
+ functions.insert(
+ String::from("array_replace_n"),
+ Box::new(replace::array_replace_n_udf) as _,
+ );
+
+
+
+ // TODO: Add more builtin functions here
+ Mutex::new(functions)
+ })
+}
+
+// Get an UDF by name
+//
+// Replace with `get_udf`
+// fn get_function_meta(&self, name: &str) -> Option<Arc<ScalarUDF>> {
+// self.state.scalar_functions().get(name).cloned()
+// }
+pub fn get_array_udf(name: &str) -> Option<Arc<ScalarUDF>> {
+ array_functions().lock().unwrap().get(name).map(|f| f())
+}
+
+/// Register a single new UDF, so the user can register their own functions
+///
+/// Repalce old regsiter_udf
+pub fn register_array_udf(name: &str, udf: ScalarFactory) ->
Option<ScalarFactory> {
+ // TODO: Check overwrite?
+ array_functions().lock().unwrap().insert(name.to_string(), udf)
Review Comment:
If we switch to static map for storing boxed fn impl, the user can only
register with this method
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