flink-python/pyflink/table/tests/test_explain.py

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import json

from pyflink.testing.test_case_utils import PyFlinkStreamTableTestCase
from pyflink.table.explain_detail import ExplainDetail


class StreamTableExplainTests(PyFlinkStreamTableTestCase):

    def test_explain(self):
        t = self.t_env.from_elements([(1, 'Hi', 'Hello')], ['a', 'b', 'c'])
        result = t.group_by("c").select(t.a.sum, t.c.alias('b')).explain(
            ExplainDetail.CHANGELOG_MODE)

        assert isinstance(result, str)

        result = t.group_by("c").select(t.a.sum, t.c.alias('b')).explain(
            ExplainDetail.JSON_EXECUTION_PLAN)
        assert isinstance(result, str)
        try:
            json.loads(result.split('== Physical Execution Plan ==')[1])
        except:
            self.fail('The execution plan of explain detail is not in json format.')


if __name__ == '__main__':
    import unittest

    try:
        import xmlrunner
        testRunner = xmlrunner.XMLTestRunner(output='target/test-reports')
    except ImportError:
        testRunner = None
    unittest.main(testRunner=testRunner, verbosity=2)