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import pytest
from tests.common.custom_cluster_test_suite import CustomClusterTestSuite
from tests.common.impala_test_suite import ImpalaTestSuite
from tests.common.test_vector import ImpalaTestDimension
from tests.common.skip import SkipIfBuildType
from tests.common.test_dimensions import create_exec_option_dimension

class TestLocalTzConversion(CustomClusterTestSuite):
  """Tests for --use_local_tz_for_unix_timestamp_conversions"""

  @classmethod
  def add_test_dimensions(cls):
    super(TestLocalTzConversion, cls).add_test_dimensions()
    cls.ImpalaTestMatrix.add_dimension(create_exec_option_dimension(
        cluster_sizes=[0], disable_codegen_options=[False, True], batch_sizes=[0]))
    # Test with and without expr rewrites to cover regular expr evaluations
    # as well as constant folding, in particular, timestamp literals.
    cls.ImpalaTestMatrix.add_dimension(
        ImpalaTestDimension('enable_expr_rewrites', *[0,1]))

  @classmethod
  def add_custom_cluster_constraints(cls):
    # Do not call the super() implementation because this class needs to relax the
    # set of constraints.
    cls.ImpalaTestMatrix.add_constraint(lambda v:
        v.get_value('table_format').file_format == 'text' and
        v.get_value('table_format').compression_codec == 'none')

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

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args("--use_local_tz_for_unix_timestamp_conversions=true")
  def test_timestamp_functions(self, vector):
    """Tests timestamp functions with --use_local_tz_for_unix_timestamp_conversions=true
    """
    vector.get_value('exec_option')['enable_expr_rewrites'] = \
        vector.get_value('enable_expr_rewrites')

    # Tests for UTC timestamp functions, i.e. functions that do not depend on the
    # behavior of the flag --use_local_tz_for_unix_timestamp_conversions. These tests
    # are also executed in test_exprs.py to ensure the same behavior when running
    # without the gflag set.
    self.run_test_case('QueryTest/utc-timestamp-functions', vector)

    # Tests for local timestamp functions, i.e. functions that depend on the
    # behavior of the flag --use_local_tz_for_unix_timestamp_conversions.
    self.run_test_case('QueryTest/local-timestamp-functions', vector)