public OptimizerMetaData getMetaData(final String databaseName) {
        return optimizerMetaData.get(databaseName);
    }
@Test
    void assertGetOptimizerMetaData() {
        OptimizerContext actual = OptimizerContextFactory.create(Collections.singletonMap(DefaultDatabase.LOGIC_NAME, createShardingSphereDatabase()));
        assertThat(actual.getMetaData(DefaultDatabase.LOGIC_NAME), instanceOf(OptimizerMetaData.class));
    }