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from __future__ import absolute_import, division, print_function
from builtins import range
from tests.common.impala_test_suite import ImpalaTestSuite
from tests.common.skip import SkipIfCatalogV2

# This test requires that testdata/avro_schema_resolution/create_table.sql has been run
class TestAvroSchemaResolution(ImpalaTestSuite):
  @classmethod
  def add_test_dimensions(cls):
    super(TestAvroSchemaResolution, cls).add_test_dimensions()
    # avro/snap is the only table format with a schema_resolution_test table
    cls.ImpalaTestMatrix.add_constraint(lambda v:\
        v.get_value('table_format').file_format == 'avro' and\
        v.get_value('table_format').compression_codec == 'snap')

  def test_avro_schema_resolution(self, vector, unique_database):
    self.run_test_case('QueryTest/avro-schema-resolution', vector, unique_database)

  def test_avro_c_lib_unicode_nulls(self, vector):
    """Test for IMPALA-1136 and IMPALA-2161 and unicode characters in the
    schema that were not handled correctly by the Avro C library.
    """
    result = self.execute_query("select * from functional_avro_snap.avro_unicode_nulls")
    comparison = self.execute_query("select * from functional.liketbl")

    # If we were not able to properly parse the Avro file schemas, then the result
    # would be empty.
    assert len(comparison.data) == len(result.data)
    for x in range(len(result.data)):
      assert comparison.data[x] == result.data[x]

  @SkipIfCatalogV2.catalog_v1_test()
  def test_avro_schema_changes(self, vector, unique_database):
    """Test for IMPALA-3314 and IMPALA-3513: Impalad shouldn't crash with stale Avro
    metadata. Instead, should provide a meaningful error message.
    Test for IMPALA-3092: Impala should be able to query an Avro table after ALTER TABLE
    ... ADD COLUMN ...
    Test for IMPALA-3776: Fix describe formatted when changing Avro schema.
    """
    self.run_test_case('QueryTest/avro-schema-changes', vector, unique_database)