Revert "Remove Python 3.9 support (apache#2554)"

This reverts commit 1bef2a4

Author: geruh

.github/workflows/pypi-build-artifacts.yml

@@ -42,6 +42,7 @@ jobs:
       - uses: actions/setup-python@v6
         with:
           python-version: |
+            3.9
             3.10
             3.11
             3.12
@@ -68,7 +69,7 @@ jobs:
         env:
           # Ignore 32 bit architectures
           CIBW_ARCHS: "auto64"
-          CIBW_PROJECT_REQUIRES_PYTHON: ">=3.10"
+          CIBW_PROJECT_REQUIRES_PYTHON: ">=3.9,<3.13"
           CIBW_TEST_REQUIRES: "pytest==7.4.2 moto==5.0.1"
           CIBW_TEST_COMMAND: "pytest {project}/tests/avro/test_decoder.py"
           CIBW_BUILD_VERBOSITY: 1

.github/workflows/python-ci.yml

@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ['3.10', '3.11', '3.12']
+        python: ['3.9', '3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v5
@@ -71,7 +71,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: ['3.10', '3.11', '3.12']
+        python: ['3.9', '3.10', '3.11', '3.12']
 
     steps:
     - uses: actions/checkout@v5

.github/workflows/svn-build-artifacts.yml

@@ -42,6 +42,7 @@ jobs:
       - uses: actions/setup-python@v6
         with:
           python-version: |
+            3.9
             3.10
             3.11
             3.12
@@ -63,7 +64,7 @@ jobs:
         env:
           # Ignore 32 bit architectures
           CIBW_ARCHS: "auto64"
-          CIBW_PROJECT_REQUIRES_PYTHON: ">=3.10"
+          CIBW_PROJECT_REQUIRES_PYTHON: ">=3.9,<3.13"
           CIBW_TEST_REQUIRES: "pytest==7.4.2 moto==5.0.1"
           CIBW_TEST_COMMAND: "pytest {project}/tests/avro/test_decoder.py"
           # Ignore tests for pypy since not all dependencies are compiled for it

mkdocs/docs/contributing.md

@@ -234,6 +234,8 @@ Deprecated in 0.1.0, will be removed in 0.2.0. The old_property is deprecated. P
 
 For the type annotation the types from the `Typing` package are used.
 
+PyIceberg offers support from Python 3.9 onwards, we can't use the [type hints from the standard collections](https://peps.python.org/pep-0585/).
+
 ### Third party libraries
 
 PyIceberg naturally integrates into the rich Python ecosystem, however it is important to be hesitant adding third party packages. Adding a lot of packages makes the library heavyweight, and causes incompatibilities with other projects if they use a different version of the library. Also, big libraries such as `s3fs`, `adlfs`, `pyarrow`, `thrift` should be optional to avoid downloading everything, while not being sure if is actually being used.