[Improvement] Eliminate raw use of parameterized class

[advancedxy]

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• I have searched in the issues and found no similar issues.

What would you like to be improved?

When I'm browsing the Uniffle codebase, a lot of raw use of parameterized class occurred, especially in test classes.

For instance, the iterator parameter and product2 variable is raw use of parameterized class

incubator-uniffle/client-spark/common/src/test/java/org/apache/spark/shuffle/reader/AbstractRssReaderTest.java

Lines 51 to 63 in 66c752f

	protected void validateResult(Iterator iterator,
	Map<String, String> expectedData, int recordNum) {
	Set<String> actualKeys = Sets.newHashSet();
	while (iterator.hasNext()) {
	Product2 product2 = (Product2) iterator.next();
	String key = (String) product2._1();
	String value = (String) product2._2();
	actualKeys.add(key);
	assertEquals(expectedData.get(key), value);
	}
	assertEquals(recordNum, actualKeys.size());
	assertEquals(expectedData.keySet(), actualKeys);
	}

How should we improve?

Eliminate the raw use of parameterized class as much as possible.

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[cchung100m]

Hi @advancedxy

I'd like to handle this issue if you agreed. Thank you.

[jerqi]

I assigned to you.