UnaryExpression Contract

UnaryExpression is…FIXME

defineCodeGen(
  ctx: CodegenContext,
  ev: ExprCode,
  f: String => String): ExprCode

defineCodeGen…FIXME

Note	`defineCodeGen` is used when…FIXME

nullSafeEval(input: Any): Any

nullSafeEval simply fails with the following error (and is expected to be overrided to save null-check code):

UnaryExpressions must override either eval or nullSafeEval

Note	`nullSafeEval` is used exclusively when `UnaryExpression` is requested to eval.

eval(input: InternalRow): Any

Note	`eval` is part of Expression Contract for the interpreted (non-code-generated) expression evaluation, i.e. evaluating a Catalyst expression to a JVM object for a given internal binary row.

eval…FIXME

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