@Override
    public int hashCode() {
        int result = name != null ? name.hashCode() : 0;
        result = 31 * result + type;
        result = 31 * result + (precision != null ? precision.hashCode() : 0);
        result = 31 * result + (constraints != null ? constraints.hashCode() : 0);
        return result;
    }
Gets the precision.  This can be null!

@return precision or null
tika-eval/tika-eval-app/src/main/java/org/apache/tika/eval/app/db/ColInfo.java