switch implementation of host to use ScalarUDFImpl

src/postgres/mod.rs

@@ -13,7 +13,7 @@ use crate::postgres::math_udfs::{
     Acosd, Asind, Atand, Ceiling, Cosd, Cotd, Div, Erf, Erfc, RandomNormal, Sind, Tand,
 };
 use crate::postgres::network_udfs::{
-    broadcast, family, host, HostMask, InetMerge, InetSameFamily, MaskLen, Netmask, Network,
+    broadcast, family, Host, HostMask, InetMerge, InetSameFamily, MaskLen, Netmask, Network,
     SetMaskLen,
 };
 
@@ -45,7 +45,7 @@ fn register_math_udfs(ctx: &SessionContext) -> Result<()> {
 fn register_network_udfs(ctx: &SessionContext) -> Result<()> {
     register_broadcast(ctx);
     register_family(ctx);
-    register_host(ctx);
+    ctx.register_udf(ScalarUDF::from(Host::new()));
     ctx.register_udf(ScalarUDF::from(HostMask::new()));
     ctx.register_udf(ScalarUDF::from(InetSameFamily::new()));
     ctx.register_udf(ScalarUDF::from(InetMerge::new()));
@@ -81,16 +81,3 @@ fn register_family(ctx: &SessionContext) {
 
     ctx.register_udf(family_udf);
 }
-
-fn register_host(ctx: &SessionContext) {
-    let host_udf = make_scalar_function(host);
-    let return_type: ReturnTypeFunction = Arc::new(move |_| Ok(Arc::new(Utf8)));
-    let host_udf = ScalarUDF::new(
-        "host",
-        &Signature::uniform(1, vec![Utf8], Volatility::Immutable),
-        &return_type,
-        &host_udf,
-    );
-
-    ctx.register_udf(host_udf);
-}

src/postgres/network_udfs.rs

@@ -33,29 +33,6 @@ pub fn broadcast(args: &[ArrayRef]) -> Result<ArrayRef> {
     Ok(Arc::new(string_builder.finish()) as ArrayRef)
 }
 
-/// Gives the host address for network.
-/// Returns NULL for columns with NULL values.
-pub fn host(args: &[ArrayRef]) -> Result<ArrayRef> {
-    let mut string_builder = StringBuilder::with_capacity(args[0].len(), u8::MAX as usize);
-    let ip_string = datafusion::common::cast::as_string_array(&args[0])?;
-    ip_string.iter().try_for_each(|ip_string| {
-        if let Some(ip_string) = ip_string {
-            let host_address = IpNet::from_str(ip_string)
-                .map_err(|e| {
-                    DataFusionError::Internal(format!("Parsing {ip_string} failed with error {e}"))
-                })?
-                .network();
-            string_builder.append_value(host_address.to_string());
-            Ok::<(), DataFusionError>(())
-        } else {
-            string_builder.append_null();
-            Ok::<(), DataFusionError>(())
-        }
-    })?;
-
-    Ok(Arc::new(string_builder.finish()) as ArrayRef)
-}
-
 /// Returns the address's family: 4 for IPv4, 6 for IPv6.
 /// Returns NULL for columns with NULL values.
 pub fn family(args: &[ArrayRef]) -> Result<ArrayRef> {
@@ -83,6 +60,65 @@ pub fn family(args: &[ArrayRef]) -> Result<ArrayRef> {
     Ok(Arc::new(int8array.finish()) as ArrayRef)
 }
 
+/// Gives the host address for the network.
+/// Returns NULL for columns with NULL values.
+#[derive(Debug)]
+pub struct Host {
+    signature: Signature,
+}
+
+impl Host {
+    pub fn new() -> Self {
+        Self {
+            signature: Signature::uniform(1, vec![Utf8], Volatility::Immutable),
+        }
+    }
+}
+
+impl ScalarUDFImpl for Host {
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+
+    fn name(&self) -> &str {
+        "host"
+    }
+
+    fn signature(&self) -> &Signature {
+        &self.signature
+    }
+
+    fn return_type(&self, _arg_types: &[DataType]) -> Result<DataType> {
+        Ok(Utf8)
+    }
+
+    fn invoke(&self, args: &[ColumnarValue]) -> Result<ColumnarValue> {
+        let args = ColumnarValue::values_to_arrays(args)?;
+        let mut string_builder = StringBuilder::with_capacity(args[0].len(), u8::MAX as usize);
+        let ip_string = datafusion::common::cast::as_string_array(&args[0])?;
+        ip_string.iter().try_for_each(|ip_string| {
+            if let Some(ip_string) = ip_string {
+                let host_address = IpNet::from_str(ip_string)
+                    .map_err(|e| {
+                        DataFusionError::Internal(format!(
+                            "Parsing {ip_string} failed with error {e}"
+                        ))
+                    })?
+                    .network();
+                string_builder.append_value(host_address.to_string());
+                Ok::<(), DataFusionError>(())
+            } else {
+                string_builder.append_null();
+                Ok::<(), DataFusionError>(())
+            }
+        })?;
+
+        Ok(ColumnarValue::Array(
+            Arc::new(string_builder.finish()) as ArrayRef
+        ))
+    }
+}
+
 /// Constructs host mask for network.
 /// Returns NULL for columns with NULL values.
 #[derive(Debug)]