justinmclean opened a new issue, #9142:
URL: https://github.com/apache/gravitino/issues/9142
### What would you like to be improved?
Here's a unit test to show the issue:
```
@Test
public void testSystemTablePageSourceReturnsPageOnlyOnce() {
Page page = new Page(0);
GravitinoSystemConnector.SystemTablePageSource pageSource =
new GravitinoSystemConnector.SystemTablePageSource(page);
assertFalse(pageSource.isFinished());
assertSame(page, pageSource.getNextPage());
assertTrue(pageSource.isFinished());
assertNull(pageSource.getNextPage());
}
```
### How should we improve?
Have getNextPage return null if it finishes
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