Function regexp_instr_func

datafusion/functions/src/regex/regexpinstr.rs:156–183

(args: &[ArrayRef])

}

pub fn regexp_instr_func(args: &[ArrayRef]) -> Result<ArrayRef> {
    let args_len = args.len();
    if !(2..=6).contains(&args_len) {
        return exec_err!(
            "regexp_instr was called with {args_len} arguments. It requires at least 2 and at most 6."
        );
    }

    let values = &args[0];
    match values.data_type() {
        Utf8 | LargeUtf8 | Utf8View => (),
        other => {
            return internal_err!(
                "Unsupported data type {other:?} for function regexp_instr"
            );
        }
    }

    regexp_instr(
        values,
        &args[1],
        if args_len > 2 { Some(&args[2]) } else { None },
        if args_len > 3 { Some(&args[3]) } else { None },
        if args_len > 4 { Some(&args[4]) } else { None },
        if args_len > 5 { Some(&args[5]) } else { None },
    )
    .map_err(|e| e.into())
}

/// `arrow-rs` style implementation of `regexp_instr` function.
/// This function `regexp_instr` is responsible for returning the index of a regular expression pattern