Commits on Jan 15, 2020

1. colexec: fix an issue with builtin operators and a minor cleanup …

   Flat bytes relies on coldata.Batch.SetLength call to maintain its
   invariant. We assume that it is always called before return the batch in
   which Bytes vector might have been modified. This was not the case for
   default builtin and substring operators, and the calls were added.
   Additionally, to be safe, similar calls have been in added in projection
   operators.
   
   In a few places where we were setting the length of an internal batch to
   0 and then returning it, those were replaced with returning
   coldata.ZeroBatch. This forced us to refactor CASE and AND/OR operators
   to handle cases of zero-length batches (previously, they assumed
   a well-typed zero-length batch which is not always the case).
   
   Release note: None

   

   yuzefovich committed Jan 15, 2020
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