fix #3094 - avoid duplicate fields in schema classes #3102
Merged
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Why:
The various Schema subclasses (ArraySchema, BinarySchema, etc.) are
defined such that they actually duplicate some of the fields from
the Schema super class (e.g. type, format, default, etc.). This
can create confusion when examining instances of these classes within
a debugger as you will see two "type" fields for example, the base class'
"type" field will be set to null and the subclass' "type" field will be set
to "array" (or "binary", or "boolean", etc.). We have similar issues with
the format and default fields.
What:
In this PR, I've fixed this by adding a protected ctor to Schema, and default ctors to
the subclasses, plus I've removed some getters/setters from the subclasses
that are no longer needed.