Ted Yu created KYLIN-3144:
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             Summary: Adopt Collections.emptyList() for empty list values
                 Key: KYLIN-3144
                 URL: https://issues.apache.org/jira/browse/KYLIN-3144
             Project: Kylin
          Issue Type: Improvement
            Reporter: Ted Yu
            Priority: Minor


Use Collection.emptyList() for returning an empty list instead of returning new 
ArrayList<>().

The default constructor creates a buffer of size 10 for ArrayList . Therefore, 
returning this static value saves some memory and lessens GC pressure.

One candidate for replacement is in HybridService#listHybrids()



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