HyukjinKwon commented on a change in pull request #30059:
URL: https://github.com/apache/spark/pull/30059#discussion_r505941601



##########
File path: .github/workflows/build_and_test.yml
##########
@@ -201,6 +173,92 @@ jobs:
         name: unit-tests-log-${{ matrix.modules }}-${{ matrix.comment }}-${{ 
matrix.java }}-${{ matrix.hadoop }}-${{ matrix.hive }}
         path: "**/target/unit-tests.log"
 
+  pyspark:
+    name: "Build modules: ${{ matrix.modules }}"
+    runs-on: ubuntu-20.04
+    container:
+      image: dongjoon/apache-spark-github-action-image:20201015
+    strategy:
+      fail-fast: false
+      matrix:
+        modules:
+          - >-
+            pyspark-sql, pyspark-mllib, pyspark-resource
+          - >-
+            pyspark-core, pyspark-streaming, pyspark-ml
+    env:
+      MODULES_TO_TEST: ${{ matrix.modules }}
+      HADOOP_PROFILE: hadoop3.2
+      HIVE_PROFILE: hive2.3
+      # GitHub Actions' default miniconda to use in pip packaging test.
+      CONDA_PREFIX: /usr/share/miniconda
+      GITHUB_PREV_SHA: ${{ github.event.before }}
+      GITHUB_INPUT_BRANCH: ${{ github.event.inputs.target }}
+    steps:
+    - name: Checkout Spark repository
+      uses: actions/checkout@v2
+      # In order to fetch changed files
+      with:
+        fetch-depth: 0
+    - name: Merge dispatched input branch
+      if: ${{ github.event.inputs.target != '' }}
+      run: git merge --progress --ff-only origin/${{ 
github.event.inputs.target }}
+    # Cache local repositories. Note that GitHub Actions cache has a 2G limit.
+    - name: Cache Scala, SBT, Maven and Zinc
+      uses: actions/cache@v2
+      with:
+        path: |
+          build/apache-maven-*
+          build/zinc-*
+          build/scala-*
+          build/*.jar
+        key: build-${{ hashFiles('**/pom.xml', 'project/build.properties', 
'build/mvn', 'build/sbt', 'build/sbt-launch-lib.bash', 
'build/spark-build-info') }}
+        restore-keys: |
+          build-
+    - name: Cache Maven local repository
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2/repository
+        key: pyspark-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          pyspark-maven-
+    - name: Cache Ivy local repository
+      uses: actions/cache@v2
+      with:
+        path: ~/.ivy2/cache
+        key: pyspark-ivy-${{ hashFiles('**/pom.xml', '**/plugins.sbt') }}
+        restore-keys: |
+          pyspark-ivy-
+    - name: Install Python 3.6
+      uses: actions/setup-python@v2
+      if: contains(matrix.modules, 'pyspark')
+      with:
+        python-version: 3.6
+        architecture: x64
+    - name: Install Python packages (Python 3.6)

Review comment:
       ```suggestion
       # This step takes much less time (~30s) than other Python versions so it 
is not included
       # in the Docker image being used. There is also a technical issue to 
install Python 3.6 on
       # Ubuntu 20.04. See also SPARK-33162.
       - name: Install Python packages (Python 3.6)
   ```




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