Commits on Apr 29, 2019

1. tree: permit NULL sequences to be typed as desired …

   Previously, expressions that contained a sequence of expressions
   (anything that uses `TypeCheckSameTypedExprs`) would fail to coerce
   those expressions to a desired type if all of those expressions were
   statically typed as `NULL`. Concretely, this led to expressions like
   
   ```
   ARRAY[NULL, NULL]:::int[]
   ```
   
   to not be type-checkable.
   
   Also, make sure that arrays that contain only null are serialized
   properly, by ensuring that they get a type annotation to prevent
   ambiguity.
   
   Release note (bug fix): permit arrays and other sequences to be
   type-checkable in certain contexts when all of their elements are null.

   

   jordanlewis committed Apr 29, 2019
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