refactor: drop support for Python 3.8

In accordance with NEP-29 https://numpy.org/neps/nep-0029-deprecation_policy.html

.github/workflows/ci.yml

@@ -59,7 +59,6 @@ jobs:
         os:
           - ubuntu-latest
         python-version:
-          - "38"
           - "39"
           - "310"
           - "311"
@@ -90,16 +89,18 @@ jobs:
         os:
           - ubuntu-latest
         python-version:
-          - "3.8"
-          - "3.10"
+          - "3.9"
+          - "3.11"
         ibis-version:
-          - "3.2"
           - "4.1"
           - "5.1"
         include:
          - os: windows-latest
+           python-version: "3.11"
+           ibis-version: "5.1"
+         - os: ubuntu-latest
            python-version: "3.10"
-           ibis-version: "4.1"
+           ibis-version: "3.2"
 
 
     steps:
@@ -130,11 +131,15 @@ jobs:
         os:
           - ubuntu-latest
         python-version:
-          - "3.8"
-          - "3.10"
+          - "3.9"
+          - "3.11"
         ibis-version:
-          - "3.2"
           - "4.1"
+          - "5.1"
+        include:
+          - os: ubuntu-latest
+            python-version: "3.10"
+            ibis-version: "3.2"
 
     steps:
       - uses: actions/checkout@v3

flake.nix

@@ -81,7 +81,7 @@
     in
     rec {
       packages = {
-        inherit (pkgs) ibisSubstrait38 ibisSubstrait39 ibisSubstrait310 ibisSubstrait311;
+        inherit (pkgs) ibisSubstrait39 ibisSubstrait310 ibisSubstrait311;
 
         default = pkgs.ibisSubstrait311;
       };
@@ -90,7 +90,6 @@
       nixpkgs = pkgs;
 
       devShells = rec {
-        ibisSubstrait38 = mkDevShell pkgs.ibisSubstraitDevEnv38;
         ibisSubstrait39 = mkDevShell pkgs.ibisSubstraitDevEnv39;
         ibisSubstrait310 = mkDevShell pkgs.ibisSubstraitDevEnv310;
         ibisSubstrait311 = mkDevShell pkgs.ibisSubstraitDevEnv311;

nix/overlay.nix

@@ -39,12 +39,10 @@ let
     final.callPackage drv { inherit python; };
 in
 {
-  ibisSubstraitDevEnv38 = mkPoetryEnv final.python38;
   ibisSubstraitDevEnv39 = mkPoetryEnv final.python39;
   ibisSubstraitDevEnv310 = mkPoetryEnv final.python310;
   ibisSubstraitDevEnv311 = mkPoetryEnv final.python311;
 
-  ibisSubstrait38 = mkIbisSubstrait final.python38;
   ibisSubstrait39 = mkIbisSubstrait final.python39;
   ibisSubstrait310 = mkIbisSubstrait final.python310;
   ibisSubstrait311 = mkIbisSubstrait final.python311;

pyproject.toml

@@ -19,7 +19,7 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.8.1,<4"
+python = ">=3.9,<4"
 ibis-framework = ">=3"
 packaging = ">=21.3"
 pyyaml = ">=5"
@@ -109,10 +109,9 @@ ignore = [
   "SIM114", # combine `if` branches
   "SIM117", # nested withs
   "SIM118", # remove .keys() calls from dictionaries
-  # TODO(gil): re-enable after we drop 3.8
   "UP006", # use collections.deque instead of Deque for type annotation
 ]
-target-version = "py38"
+target-version = "py39"
 
 [tool.ruff.per-file-ignores]
 "*test*.py" = ["D"] # ignore all docstring lints in tests