feat: implement aggregates to support min/max

Author: blitss

Cargo.toml

@@ -3,9 +3,6 @@ name = "typeid"
 version = "0.0.0"
 edition = "2021"
 
-[build]
-rustflags = ["-C", "target-feature=+aes"]
-
 [lib]
 crate-type = ["cdylib", "lib"]
 

src/aggregate.rs

@@ -0,0 +1,130 @@
+use pgrx::{aggregate::*, pg_aggregate, pg_sys};
+
+use crate::typeid::TypeID;
+
+pub struct TypeIDMin;
+pub struct TypeIDMax;
+
+#[pg_aggregate]
+impl Aggregate for TypeIDMin {
+    const NAME: &'static str = "min";
+    type Args = TypeID;
+    type State = Option<TypeID>;
+
+    fn state(
+        current: Self::State,
+        arg: Self::Args,
+        _fcinfo: pg_sys::FunctionCallInfo,
+    ) -> Self::State {
+        match current {
+            None => Some(arg),
+            Some(current) => Some(if arg < current { arg } else { current }),
+        }
+    }
+}
+
+#[pg_aggregate]
+impl Aggregate for TypeIDMax {
+    const NAME: &'static str = "max";
+    type Args = TypeID;
+    type State = Option<TypeID>;
+
+    fn state(
+        current: Self::State,
+        arg: Self::Args,
+        _fcinfo: pg_sys::FunctionCallInfo,
+    ) -> Self::State {
+        match current {
+            None => Some(arg),
+            Some(current) => Some(if arg > current { arg } else { current }),
+        }
+    }
+}
+
+#[cfg(any(test, feature = "pg_test"))]
+#[pgrx::pg_schema]
+mod tests {
+    use super::*;
+    use pgrx::prelude::*;
+
+    #[pg_test]
+    fn test_typeid_min_max_aggregates() {
+        Spi::connect(|mut client| {
+            // Create a temporary table
+            client
+                .update("CREATE TEMPORARY TABLE test_typeid (id typeid)", None, None)
+                .unwrap();
+
+            // Insert some test data
+            client.update("INSERT INTO test_typeid VALUES (typeid_generate('user')), (typeid_generate('user')), (typeid_generate('user'))", None, None).unwrap();
+
+            // Test min aggregate
+            let result = client
+                .select("SELECT min(id) FROM test_typeid", None, None)
+                .unwrap();
+
+            assert_eq!(result.len(), 1);
+            let min_typeid: TypeID = result
+                .first()
+                .get_one()
+                .unwrap()
+                .expect("didnt get min typeid");
+
+            // Test max aggregate
+            let result = client
+                .select("SELECT max(id) FROM test_typeid", None, None)
+                .unwrap();
+            assert_eq!(result.len(), 1);
+            let max_typeid: TypeID = result
+                .first()
+                .get_one()
+                .unwrap()
+                .expect("didnt get max typeid");
+
+            // Verify that max is greater than min
+            assert!(max_typeid > min_typeid);
+
+            // Test with empty table
+            client.update("TRUNCATE test_typeid", None, None).unwrap();
+            let result = client
+                .select("SELECT min(id), max(id) FROM test_typeid", None, None)
+                .unwrap();
+            assert_eq!(result.len(), 1);
+
+            let (min_typeid, max_typeid): (Option<TypeID>, Option<TypeID>) =
+                result.first().get_two().unwrap();
+            assert_eq!(min_typeid, None);
+            assert_eq!(max_typeid, None);
+
+            // Test with single value
+            client
+                .update(
+                    "INSERT INTO test_typeid VALUES (typeid_generate('user'))",
+                    None,
+                    None,
+                )
+                .unwrap();
+            let result = client
+                .select("SELECT min(id), max(id) FROM test_typeid", None, None)
+                .unwrap();
+            assert_eq!(result.len(), 1);
+            let (min_typeid, max_typeid): (Option<TypeID>, Option<TypeID>) =
+                result.first().get_two().unwrap();
+
+            assert_eq!(min_typeid.unwrap(), max_typeid.unwrap());
+
+            // Test with multiple prefixes
+            client.update("TRUNCATE test_typeid", None, None).unwrap();
+            client.update("INSERT INTO test_typeid VALUES (typeid_generate('user')), (typeid_generate('post')), (typeid_generate('comment'))", None, None).unwrap();
+            let result = client
+                .select("SELECT min(id), max(id) FROM test_typeid", None, None)
+                .unwrap();
+            assert_eq!(result.len(), 1);
+            let (min_typeid, max_typeid): (Option<TypeID>, Option<TypeID>) =
+                result.first().get_two().unwrap();
+
+            assert!(min_typeid.unwrap().type_prefix() == "comment");
+            assert!(max_typeid.unwrap().type_prefix() == "user");
+        })
+    }
+}

src/lib.rs

@@ -1,3 +1,4 @@
+pub mod aggregate;
 pub mod base32;
 pub mod typeid;
 
@@ -32,10 +33,7 @@ fn uuid_to_typeid(prefix: &str, uuid: pgrx::Uuid) -> TypeID {
 
 #[pg_extern]
 fn typeid_cmp(a: TypeID, b: TypeID) -> i32 {
-    match a.type_prefix().cmp(b.type_prefix()) {
-        std::cmp::Ordering::Equal => a.uuid().cmp(b.uuid()) as i32,
-        other => other as i32,
-    }
+    a.cmp(&b) as i32
 }
 
 #[pg_extern]
@@ -198,7 +196,6 @@ mod tests {
         Spi::run("CREATE TABLE question (id typeid);").unwrap();
         Spi::run("CREATE TABLE answer (id typeid, question typeid);").unwrap();
 
-        println!("Creating tables");
         // Generate and insert test data
         let typeid1 = typeid_generate("qual");
         let typeid2 = typeid_generate("answer");
@@ -236,7 +233,6 @@ mod tests {
             .unwrap()
             .expect("expected to find oid");
 
-        println!("Inserting into table: {:?}", oid);
         Spi::run_with_args(
             &query,
             Some(vec![
@@ -251,7 +247,6 @@ mod tests {
         let query = format!("INSERT INTO {} (id) VALUES ($1::typeid)", table_name);
         let oid = oid_for_type("typeid").unwrap();
 
-        println!("Inserting into table: {:?}", oid.unwrap());
         Spi::run_with_args(
             &query,
             Some(vec![(

src/typeid.rs

@@ -1,5 +1,5 @@
 use core::fmt;
-use std::borrow::Cow;
+use std::{borrow::Cow, cmp::Ordering};
 
 use pgrx::prelude::*;
 use serde::{Deserialize, Serialize};
@@ -25,7 +25,7 @@ pub enum Error {
     InvalidData,
 }
 
-#[derive(Serialize, Deserialize, PartialEq, Eq, Clone)]
+#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, Clone, PartialOrd)]
 pub struct TypeIDPrefix(String);
 
 impl TypeIDPrefix {
@@ -73,7 +73,7 @@ impl TypeIDPrefix {
     }
 }
 
-#[derive(Serialize, Deserialize, Clone, PostgresType, PartialEq, Eq)]
+#[derive(Debug, Serialize, Deserialize, Clone, PostgresType, PartialOrd, PartialEq, Eq)]
 #[inoutfuncs]
 pub struct TypeID(TypeIDPrefix, Uuid);
 
@@ -108,6 +108,15 @@ impl TypeID {
     }
 }
 
+impl Ord for TypeID {
+    fn cmp(&self, b: &Self) -> Ordering {
+        match self.type_prefix().cmp(b.type_prefix()) {
+            std::cmp::Ordering::Equal => self.uuid().cmp(b.uuid()),
+            other => other,
+        }
+    }
+}
+
 impl Hash for TypeID {
     fn hash<H: Hasher>(&self, state: &mut H) {
         self.type_prefix().as_bytes().hash(state);
@@ -135,7 +144,10 @@ impl InOutFuncs for TypeID {
         // Convert the input to a str and handle potential UTF-8 errors
         let str_input = input.to_str().expect("text input is not valid UTF8");
 
-        TypeID::from_string(str_input).unwrap()
+        match TypeID::from_string(str_input) {
+            Ok(typeid) => typeid,
+            Err(err) => panic!("Failed to construct TypeId<{str_input}>: {err}"),
+        }
     }
 
     fn output(&self, buffer: &mut pgrx::StringInfo) {