fix the data pull problem when use alluxio as fs.

[awkwardd]

Description

When use alluxio as hive fs,cant get data from alluxio. I finaly found that the AlluxioIterator.java didn't generate correct file location as alluxio://192...../dir/filename but alluxio:///dir/filename, so I modify the code.It works for me.Fix the issue#23778

[cla-bot[bot]]

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[raunaqmorarka]

Could you add a test for this problem ?

[cla-bot[bot]]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: tanyajun. This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
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[JiamingMai]

@awkwardd you may also need to sign the CLA https://trino.io/development/process#contribution-process

[awkwardd]

@awkwardd you may also need to sign the CLA https://trino.io/development/process#contribution-process

I have signed the cla file and snet it last night.

[ebyhr]

@cla-bot check

[cla-bot[bot]]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: tanyajun. This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
2. If not, set it up using git config --global user.email [email protected]
3. Make sure that the git commit email is configured in your GitHub account settings, see https://github.com/settings/emails

[cla-bot[bot]]

The cla-bot has been summoned, and re-checked this pull request!

[ebyhr]

@awkwardd Please take a look at https://github.com/trinodb/trino/pull/23815#issuecomment-2453593098

[raunaqmorarka]

This change looks good to me. @raunaqmorarka Could you help merge this PR?

Can we add a test here ? The existing tests didn't catch this right ?

[github-actions[bot]]

This pull request has gone a while without any activity. Tagging for triage help: @mosabua