tests/query_test/test_orc_stats.py

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from __future__ import absolute_import, division, print_function
from tests.common.impala_test_suite import ImpalaTestSuite


class TestOrcStats(ImpalaTestSuite):
  """
  This suite tests runtime optimizations based on ORC statistics.
  """

  @classmethod
  def get_workload(cls):
    return 'functional-query'

  @classmethod
  def add_test_dimensions(cls):
    super(TestOrcStats, cls).add_test_dimensions()
    cls.ImpalaTestMatrix.add_constraint(
        lambda v: v.get_value('table_format').file_format == 'orc')

  def test_orc_stats(self, vector, unique_database):
    # The test makes assumptions about the number of rows read from the orc-reader
    # inside a fragment, so we ensure that the tests run in a single fragment.
    vector.get_value('exec_option')['num_nodes'] = 1
    self.run_test_case('QueryTest/orc-stats', vector, use_db=unique_database)