jecsand838 commented on code in PR #8274:
URL: https://github.com/apache/arrow-rs/pull/8274#discussion_r2322688001
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arrow-avro/src/writer/encoder.rs:
##########
@@ -84,48 +85,211 @@ fn write_bool<W: Write + ?Sized>(writer: &mut W, v: bool)
-> Result<(), ArrowErr
/// - Null-first (default): null => 0, value => 1
/// - Null-second (Impala): value => 0, null => 1
#[inline]
-fn write_optional_branch<W: Write + ?Sized>(
+fn write_optional_index<W: Write + ?Sized>(
writer: &mut W,
is_null: bool,
- impala_mode: bool,
+ order: Nullability,
) -> Result<(), ArrowError> {
- let branch = if impala_mode == is_null { 1 } else { 0 };
- write_int(writer, branch)
+ // For NullFirst: null => 0x00, value => 0x02
+ // For NullSecond: value => 0x00, null => 0x02
+ let byte = match order {
+ Nullability::NullFirst => {
+ if is_null {
+ 0x00
+ } else {
+ 0x02
+ }
+ }
+ Nullability::NullSecond => {
+ if is_null {
+ 0x02
+ } else {
+ 0x00
+ }
+ }
Review Comment:
I like that third approach. Also @nathaniel-d-ef recommended adding a
constant for `0x00` and `0x02` to improve readability.
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