@Description("converts all the alphabets in the string to upper case")
@ScalarFunction
@SqlType(VarcharType.class)
public static Slice upper(@SqlType(VarcharType.class) Slice slice) {
Slice upper = Slices.allocate(slice.length());
for (int i = 0; i < slice.length(); i++) {
upper.setByte(i, Ascii.toUpperCase((char) slice.getByte(i)));
}
return upper;
}
