Get column metadata?

[skokenes]

Is there any way in Arquero to take a loaded table and inspect metadata about each column? For example, let's say I load CSV file into Arquero. I may want to know for a specific column:

• how many unique values are in the column
• what data types are represented in the column. strings, numbers, dates?

Are there any API calls for fetching this type of information from an aq table?