@Override
    public Optional<DatabaseAdminExecutor> create(final SQLStatementContext sqlStatementContext) {
        SQLStatement sqlStatement = sqlStatementContext.getSqlStatement();
        if (sqlStatement instanceof ShowStatement) {
            return Optional.of(new PostgreSQLShowVariableExecutor((ShowStatement) sqlStatement));
        }
        return Optional.empty();
    }
@Test
    void assertCreateWithSelectDatabase() {
        SQLStatement sqlStatement = parseSQL(PSQL_SELECT_DATABASES);
        SelectStatementContext selectStatementContext = mock(SelectStatementContext.class);
        when(selectStatementContext.getSqlStatement()).thenReturn((SelectStatement) sqlStatement);
        Optional<DatabaseAdminExecutor> actual = new PostgreSQLAdminExecutorCreator().create(selectStatementContext, PSQL_SELECT_DATABASES, "", Collections.emptyList());
        assertTrue(actual.isPresent());
    }