I'm a brand new Pentaho developer. I'm in "experimental" mode. I was able to pull Excel file. From the Design tab, I m using Microsoft Excel Input. I was able to add Excel file. I have questions about the Length column on the "Fields" tab. (It is the fifth tab next to Files, Sheets, Content and Error Handling) Do I need to specify length for all of the fields even if they look "normal" when I click on "Preview rows"? This is my first time hands on Pentaho. I need some kind of education materials. Is this an easy question to answer or Can you show me a website or a documentation that discusses this matter?

Thank you,