Expose JSON_UNION_DATA_TYPE (#95)

Author: adriangb

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "datafusion-functions-json"
-version = "0.49.0"
+version = "0.49.1"
 edition = "2021"
 description = "JSON functions for DataFusion"
 readme = "README.md"

src/common_union.rs

@@ -1,5 +1,5 @@
 use std::collections::HashMap;
-use std::sync::{Arc, OnceLock};
+use std::sync::{Arc, LazyLock, OnceLock};
 
 use datafusion::arrow::array::{
     Array, ArrayRef, AsArray, BooleanArray, Float64Array, Int64Array, NullArray, StringArray, UnionArray,
@@ -48,6 +48,8 @@ pub(crate) fn json_from_union_scalar<'a>(
     None
 }
 
+pub static JSON_UNION_DATA_TYPE: LazyLock<DataType> = LazyLock::new(JsonUnion::data_type);
+
 #[derive(Debug)]
 pub(crate) struct JsonUnion {
     bools: Vec<Option<bool>>,

src/lib.rs

@@ -21,7 +21,7 @@ mod json_length;
 mod json_object_keys;
 mod rewrite;
 
-pub use common_union::{JsonUnionEncoder, JsonUnionValue};
+pub use common_union::{JsonUnionEncoder, JsonUnionValue, JSON_UNION_DATA_TYPE};
 
 pub mod functions {
     pub use crate::json_as_text::json_as_text;