[jira] [Created] (FLINK-31817) Skip meaningless testForUnsplittable in FileInputFormat

["zouxxyy (Jira)" <ji...@apache.org>]

zouxxyy created FLINK-31817:
-------------------------------

             Summary: Skip meaningless testForUnsplittable in FileInputFormat
                 Key: FLINK-31817
                 URL: https://issues.apache.org/jira/browse/FLINK-31817
             Project: Flink
          Issue Type: Improvement
            Reporter: zouxxyy


In `FileInputFormat`

The function of `testForUnsplittable` is to detect whether the pathFile is Unsplittable, and when pathFile is Unsplittable, assign true to the member variable `unsplittable`

In fact, we can only execute it when `Unsplittable` is false. This can reduce the calls to `testForUnsplittable`
{code:java}
protected boolean testForUnsplittable(FileStatus pathFile) {
    if (getInflaterInputStreamFactory(pathFile.getPath()) != null) {
        unsplittable = true;
        return true;
    }
    return false;
}{code}



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