public OptimizerParserContext getParserContext(final String databaseName) {
        return parserContexts.get(databaseName);
    }
@Test
    void assertGetParserContext() {
        OptimizerContext actual = OptimizerContextFactory.create(Collections.singletonMap(DefaultDatabase.LOGIC_NAME, createShardingSphereDatabase()));
        assertThat(actual.getParserContext(DefaultDatabase.LOGIC_NAME), instanceOf(OptimizerParserContext.class));
    }