From 2d69565fa8c13ef5e72abbe4f551c054d3fcf1dd Mon Sep 17 00:00:00 2001
From: Ivan Kozik <ivan@ludios.org>
Date: Thu, 13 Jul 2023 06:10:23 +0000
Subject: [PATCH] postgresqlPackages.pg_embedding: init at 0.3.1

No minimum PostgreSQL version is documented, but it fails to build with PostgreSQL 13:

```
embedding.c:543:18: error: 'IndexAmRoutine' has no member named 'amadjustmembers'
  543 |         amroutine->amadjustmembers = NULL;
```
---
 .../sql/postgresql/ext/pg_embedding.nix       | 30 +++++++++++++++++++
 pkgs/servers/sql/postgresql/packages.nix      |  2 ++
 2 files changed, 32 insertions(+)
 create mode 100644 pkgs/servers/sql/postgresql/ext/pg_embedding.nix

diff --git a/pkgs/servers/sql/postgresql/ext/pg_embedding.nix b/pkgs/servers/sql/postgresql/ext/pg_embedding.nix
new file mode 100644
index 0000000000000..fc19fe3370205
--- /dev/null
+++ b/pkgs/servers/sql/postgresql/ext/pg_embedding.nix
@@ -0,0 +1,30 @@
+{ lib, stdenv, fetchFromGitHub, postgresql }:
+
+stdenv.mkDerivation rec {
+  pname = "pg_embedding";
+  version = "0.3.1";
+
+  src = fetchFromGitHub {
+    owner = "neondatabase";
+    repo = pname;
+    rev = version;
+    hash = "sha256-dpwBwomUPzxnBVnnK4IWYlP+c8Z/EKerXhgrLcQj8Gk=";
+  };
+
+  buildInputs = [ postgresql ];
+
+  installPhase = ''
+    install -D -t $out/lib *.so
+    install -D -t $out/share/postgresql/extension *.sql
+    install -D -t $out/share/postgresql/extension *.control
+  '';
+
+  meta = with lib; {
+    description = "PostgreSQL extension implementing the HNSW algorithm for vector similarity search";
+    homepage = "https://github.com/neondatabase/pg_embedding";
+    maintainers = with maintainers; [ ivan ];
+    platforms = postgresql.meta.platforms;
+    license = licenses.postgresql;
+    broken = versionOlder postgresql.version "14";
+  };
+}
diff --git a/pkgs/servers/sql/postgresql/packages.nix b/pkgs/servers/sql/postgresql/packages.nix
index 8a8fd8cca5635..ed856b80b681d 100644
--- a/pkgs/servers/sql/postgresql/packages.nix
+++ b/pkgs/servers/sql/postgresql/packages.nix
@@ -16,6 +16,8 @@ self: super: {
 
     pg_ed25519 = super.callPackage ./ext/pg_ed25519.nix { };
 
+    pg_embedding = super.callPackage ./ext/pg_embedding.nix { };
+
     pg_hint_plan = super.callPackage ./ext/pg_hint_plan.nix { };
 
     pg_ivm = super.callPackage ./ext/pg_ivm.nix { };