ADD DEBUG

Author: wjsi

Diff for: .github/workflows/core-ci.yml

@@ -74,6 +74,10 @@ jobs:
         fi
         conda list -n test
 
+    - name: Setup tmate session
+      if: ${{ matrix.python-version == '3.9' }}
+      uses: mxschmitt/action-tmate@v3
+
     - name: Test with pytest
       env:
         WITH_HADOOP: ${{ matrix.with-hadoop }}