tests/custom_cluster/test_external_planner.py

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from __future__ import absolute_import, division, print_function
import logging
import pytest
import os

from tests.common.custom_cluster_test_suite import CustomClusterTestSuite

LOG = logging.getLogger(__name__)


class TestExternalPlanner(CustomClusterTestSuite):

  @classmethod
  def setup_class(cls):
    super(TestExternalPlanner, cls).setup_class()
    os.environ["CUSTOM_CLASSPATH"] = os.getenv("IMPALA_HOME") + \
        "/java/external-frontend/target/external-frontend-1.0.jar"

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args(
    impalad_args="-jni_frontend_class=org/apache/impala/externalfrontend/TestJniFrontend")
  def test_external_frontend(self, vector):
    setup_client = self.create_impala_client()
    assert setup_client.execute("select 2").data == ['2']
    # The custom JniFrontend overrides the 'select 1' query with a 'select 42' query.
    assert setup_client.execute("select 1").data == ['42']