KYLIN-4791 Fix exception 'UnsupportedOperationException: empty.reduceLeft' when there are cast expressions in the filters of FilePruner

[zzcclp]

When execute function 'pruneSegments' of FilePruner, if there are some cast expressions in filter, it will throw exception 'UnsupportedOperationException: empty.reduceLeft'.

Solution:
Convert cast expressions in filter to attribute before translating filter.

Proposed changes

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Checklist

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Further comments

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[zzcclp]

Raise another pr