[GitHub] jena issue #345: JENA-1468: Retain variables in op (table)

[afs]

Github user afs commented on the issue:

    https://github.com/apache/jena/pull/345
  
    Use new operation `TableEmpty.isTableEmpty` to test whether a data 
structure is the empty table, not rely on the contents. Thus a table of no rows 
but with declared variables, keeps the variables in the algebra.


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