Function expr_applicable_for_cols 

pub fn expr_applicable_for_cols(col_names: &[&str], expr: &Expr) -> bool

Check whether the given expression can be resolved using only the columns col_names. This means that if this function returns true:

• the table provider can filter the table partition values with this expression
• the expression can be marked as TableProviderFilterPushDown::Exact once this filtering was performed