Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/1586#issuecomment-50424554
@javadba ,sorry, I have something confusing in expression, I am not sure if
we did correctly. Probably @marmbrus can clarifies them.
And, I know we should keep both `strlen` and `length` in SQL, but I mean we
probably just keep a single class in expression, let's say:
```
case class Strlen(child: Expression, encoding :
Expression=Literal(StrlenConstants.DefaultEncoding))
extends UnaryExpression
```
In the parser, we can provide different encoding or use the default one.
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