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105 lines
4.4 KiB
Python
105 lines
4.4 KiB
Python
#!/usr/bin/env python
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# Copyright (c) 2012 Cloudera, Inc. All rights reserved.
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# Validates limit on scan nodes
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#
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import logging
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import pytest
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from copy import copy
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from tests.beeswax.impala_beeswax import ImpalaBeeswaxException
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from tests.common.impala_test_suite import ImpalaTestSuite
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from tests.common.test_vector import *
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from tests.util.test_file_parser import QueryTestSectionReader
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class TestLimit(ImpalaTestSuite):
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LIMIT_VALUES = [1, 2, 3, 4, 5, 10, 100, 5000]
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QUERIES = ["select * from lineitem limit %d"]
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# TODO: we should be able to run count(*) in setup rather than hardcoding the values
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# but I have no idea how to do this with this framework.
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TOTAL_ROWS = 6001215
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@classmethod
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def get_workload(self):
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return 'tpch'
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@classmethod
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def add_test_dimensions(cls):
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super(TestLimit, cls).add_test_dimensions()
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# Add two more dimensions
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cls.TestMatrix.add_dimension(
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TestDimension('limit_value', *TestLimit.LIMIT_VALUES))
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cls.TestMatrix.add_dimension(TestDimension('query', *TestLimit.QUERIES))
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# Don't run with large limits and tiny batch sizes. This generates excessive
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# network traffic and makes the machine run very slowly.
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cls.TestMatrix.add_constraint(lambda v:\
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v.get_value('limit_value') < 100 or v.get_value('exec_option')['batch_size'] == 0)
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cls.TestMatrix.add_constraint(lambda v:\
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v.get_value('table_format').file_format != 'parquet')
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def test_limit(self, vector):
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# We can't validate the rows that are returned since that is non-deterministic.
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# This is why this is a python test rather than a .test.
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limit = vector.get_value('limit_value')
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expected_num_rows = min(limit, TestLimit.TOTAL_ROWS)
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query_string = vector.get_value('query') % limit
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result = self.execute_query(query_string, vector.get_value('exec_option'),
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table_format=vector.get_value('table_format'))
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assert(len(result.data) == expected_num_rows)
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# Validates the default order by limit query option functionality
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class TestDefaultOrderByLimitValue(ImpalaTestSuite):
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# Interesting default limit values. TODO: What about value of -2?
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DEFAULT_ORDER_BY_LIMIT_VALUES = [None, -1, 0, 1, 10, 100]
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@classmethod
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def get_workload(self):
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return 'functional-query'
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@classmethod
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def add_test_dimensions(cls):
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super(TestDefaultOrderByLimitValue, cls).add_test_dimensions()
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# Not interested in exploring different file formats
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cls.TestMatrix.clear_dimension('table_format')
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cls.TestMatrix.add_dimension(TestDimension('default_order_by_limit_value',
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*TestDefaultOrderByLimitValue.DEFAULT_ORDER_BY_LIMIT_VALUES))
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cls.TestMatrix.add_constraint(lambda v:\
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v.get_value('exec_option')['batch_size'] == 0)
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def test_default_order_by_limit_values(self, vector):
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limit_value = vector.get_value('default_order_by_limit_value')
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exec_options = copy(vector.get_value('exec_option'))
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if limit_value is not None:
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exec_options['default_order_by_limit'] = limit_value
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# Unless the default order by limit is -1 or None (not specified) we expect SELECT
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# ORDER BY without any limit specified to work properly.
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no_limit_should_succeed = limit_value not in [None, -1]
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# Validate the default order by limit option kicks on when no limit is specified.
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query_no_limit = "select * from functional.alltypes order by int_col"
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self.exec_query_validate(query_no_limit, exec_options,
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no_limit_should_succeed, limit_value)
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# Validate that user specified limits override the default limit value.
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query_with_limit = "select * from functional.alltypes order by int_col limit 20"
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self.exec_query_validate(query_with_limit, exec_options, True, 20)
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query_no_orderby = "select * from functional.alltypes limit 25"
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self.exec_query_validate(query_no_orderby, exec_options, True, 25)
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def exec_query_validate(self, query, exec_options, should_succeed, expected_rows):
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"""Executes a query and validates the results"""
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try:
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result = self.execute_query(query, exec_options)
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assert should_succeed, 'Query was expected to fail'
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assert len(result.data) == expected_rows,\
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'Wrong number of rows returned %d' % len(result.data)
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except ImpalaBeeswaxException as e:
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assert not should_succeed, 'Query was not expected to fail: %s' % e
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assert 'ORDER BY without LIMIT currently not supported' in str(e)
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