len function
Applies to: 
Databricks SQL preview Databricks Runtime 11.3 LTS and above
Returns the character length of string data or number of bytes of binary data. This function is a synonym for character_length function and char_length function.
Syntax
len(expr)
Arguments
expr: A STRING or BINARY expression.
Returns
An INTEGER.
The length of string data includes the trailing spaces. The length of binary data includes trailing binary zeros.
Examples
SQL
> SELECT len('Spark SQL ');
10
> SELECT len('床前明月光');
5