diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 283da2518..3c066c02f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -90,13 +90,19 @@ jobs:
       - name: Install sqlalchemy and docker pkg for postgres test
         shell: bash -l {0}
         run: |
-          # explicitly install docker, fugue and sqlalchemy package
-          # Also install ciso8601 (needed by docker) via conda, as the pip installation fails.
-          mamba install sqlalchemy psycopg2 ciso8601 -c conda-forge
-          pip install docker "fugue[sql]>=0.5.3"
-          pip install mlflow
-          pip install tpot
-          pip install dask-ml
+          # explicitly install docker, fugue and other packages
+          mamba install \
+            sqlalchemy>=1.4.23 \
+            pyhive>=0.6.4 \
+            psycopg2>=2.9.1 \
+            ciso8601>=2.2.0 \
+            tpot>=0.11.7 \
+            mlflow>=1.19.0 \
+            docker-py>=5.0.0 \
+            -c conda-forge
+          pip install "fugue[sql]>=0.5.3"
+          docker pull bde2020/hive:2.3.2-postgresql-metastore
+          docker pull bde2020/hive-metastore-postgresql:2.3.0
         if: matrix.os == 'ubuntu-latest'
       - name: Install Java (again) and test with pytest
         shell: bash -l {0}
@@ -118,7 +124,10 @@ jobs:
         # Use always() to always run this step to publish test results when there are test failures
         if: ${{ always() }}
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v2
+        with:
+          fail_ci_if_error: true
+          token: ${{ secrets.CODECOV_TOKEN }}
   test_independent:
     name: "Test in a dask cluster"
     needs: build
diff --git a/dask_sql/input_utils/hive.py b/dask_sql/input_utils/hive.py
index 9e2173bdc..1feacce1d 100644
--- a/dask_sql/input_utils/hive.py
+++ b/dask_sql/input_utils/hive.py
@@ -13,7 +13,7 @@
 
 try:
     import sqlalchemy
-except ImportError:
+except ImportError:  # pragma: no cover
     sqlalchemy = None
 
 from dask_sql.input_utils.base import BaseInputPlugin
@@ -35,9 +35,7 @@ def is_correct_input(
 
         return is_sqlalchemy_hive or is_hive_cursor or format == "hive"
 
-    def to_dc(
-        self, input_item: Any, table_name: str, format: str = None, **kwargs
-    ):  # pragma: no cover
+    def to_dc(self, input_item: Any, table_name: str, format: str = None, **kwargs):
         table_name = kwargs.pop("hive_table_name", table_name)
         schema = kwargs.pop("hive_schema_name", "default")
 
@@ -65,14 +63,16 @@ def to_dc(
         if "InputFormat" in storage_information:
             format = storage_information["InputFormat"].split(".")[-1]
         # databricks format is different, see https://github.com/dask-contrib/dask-sql/issues/83
-        elif "InputFormat" in table_information:
+        elif "InputFormat" in table_information:  # pragma: no cover
             format = table_information["InputFormat"].split(".")[-1]
-        else:
+        else:  # pragma: no cover
             raise RuntimeError(
                 "Do not understand the output of 'DESCRIBE FORMATTED <table>'"
             )
 
-        if format == "TextInputFormat" or format == "SequenceFileInputFormat":
+        if (
+            format == "TextInputFormat" or format == "SequenceFileInputFormat"
+        ):  # pragma: no cover
             storage_description = storage_information.get("Storage Desc Params", {})
             read_function = partial(
                 dd.read_csv,
@@ -81,15 +81,17 @@ def to_dc(
             )
         elif format == "ParquetInputFormat" or format == "MapredParquetInputFormat":
             read_function = dd.read_parquet
-        elif format == "OrcInputFormat":
+        elif format == "OrcInputFormat":  # pragma: no cover
             read_function = dd.read_orc
-        elif format == "JsonInputFormat":
+        elif format == "JsonInputFormat":  # pragma: no cover
             read_function = dd.read_json
-        else:
+        else:  # pragma: no cover
             raise AttributeError(f"Do not understand hive's table format {format}")
 
         def _normalize(loc):
-            if loc.startswith("dbfs:/") and not loc.startswith("dbfs://"):
+            if loc.startswith("dbfs:/") and not loc.startswith(
+                "dbfs://"
+            ):  # pragma: no cover
                 # dask (or better: fsspec) needs to have the URL in a specific form
                 # starting with two // after the protocol
                 loc = f"dbfs://{loc.lstrip('dbfs:')}"
@@ -102,6 +104,19 @@ def _normalize(loc):
         def wrapped_read_function(location, column_information, **kwargs):
             location = _normalize(location)
             logger.debug(f"Reading in hive data from {location}")
+            if format == "ParquetInputFormat" or format == "MapredParquetInputFormat":
+                # Hack needed for parquet files.
+                # If the folder structure is like .../col=3/...
+                # parquet wants to read in the partition information.
+                # However, we add the partition information by ourself
+                # which will lead to problems afterwards
+                # Therefore tell parquet to only read in the columns
+                # we actually care right now
+                kwargs.setdefault("columns", list(column_information.keys()))
+            else:  # pragma: no cover
+                # prevent python to optimize it away and make coverage not respect the
+                # pragma
+                dummy = 0
             df = read_function(location, **kwargs)
 
             logger.debug(f"Applying column information: {column_information}")
@@ -165,7 +180,7 @@ def _parse_hive_table_description(
         schema: str,
         table_name: str,
         partition: str = None,
-    ):  # pragma: no cover
+    ):
         """
         Extract all information from the output
         of the DESCRIBE FORMATTED call, which is unfortunately
@@ -207,7 +222,7 @@ def _parse_hive_table_description(
             elif key == "# Partition Information":
                 mode = "partition"
             elif key.startswith("#"):
-                mode = None
+                mode = None  # pragma: no cover
             elif key:
                 if not value:
                     value = dict()
@@ -223,6 +238,10 @@ def _parse_hive_table_description(
                 elif mode == "partition":
                     partition_information[key] = value
                     last_field = partition_information[key]
+                else:  # pragma: no cover
+                    # prevent python to optimize it away and make coverage not respect the
+                    # pragma
+                    dummy = 0
             elif value and last_field is not None:
                 last_field[value] = value2
 
@@ -238,7 +257,7 @@ def _parse_hive_partition_description(
         cursor: Union["sqlalchemy.engine.base.Connection", "hive.Cursor"],
         schema: str,
         table_name: str,
-    ):  # pragma: no cover
+    ):
         """
         Extract all partition informaton for a given table
         """
@@ -251,7 +270,7 @@ def _fetch_all_results(
         self,
         cursor: Union["sqlalchemy.engine.base.Connection", "hive.Cursor"],
         sql: str,
-    ):  # pragma: no cover
+    ):
         """
         The pyhive.Cursor and the sqlalchemy connection behave slightly different.
         The former has the fetchall method on the cursor,
@@ -261,5 +280,5 @@ def _fetch_all_results(
 
         try:
             return result.fetchall()
-        except AttributeError:
+        except AttributeError:  # pragma: no cover
             return cursor.fetchall()
diff --git a/dask_sql/physical/rel/logical/filter.py b/dask_sql/physical/rel/logical/filter.py
index 7e37a45ff..41cf16951 100644
--- a/dask_sql/physical/rel/logical/filter.py
+++ b/dask_sql/physical/rel/logical/filter.py
@@ -18,7 +18,7 @@ def filter_or_scalar(df: dd.DataFrame, filter_condition: Union[np.bool_, dd.Seri
     See https://github.com/dask-contrib/dask-sql/issues/87.
     """
     if np.isscalar(filter_condition):
-        if not filter_condition:
+        if not filter_condition:  # pragma: no cover
             # empty dataset
             logger.warning("Join condition is always false - returning empty dataset")
             return df.head(0, compute=False)
diff --git a/dask_sql/physical/rel/logical/window.py b/dask_sql/physical/rel/logical/window.py
index 2ecd10b24..ca23acfb1 100644
--- a/dask_sql/physical/rel/logical/window.py
+++ b/dask_sql/physical/rel/logical/window.py
@@ -93,6 +93,10 @@ def to_bound_description(
             # Here, we do the de-referencing.
             index = offset.getIndex() - constant_count_offset
             offset = constants[index]
+        else:  # pragma: no cover
+            # prevent python to optimize it away and make coverage not respect the
+            # pragma
+            dummy = 0
         offset = int(RexLiteralPlugin().convert(offset, None, None))
     else:
         offset = None