HippoBaro commented on code in PR #9653:
URL: https://github.com/apache/arrow-rs/pull/9653#discussion_r3090022393
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parquet/src/column/writer/mod.rs:
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@@ -328,6 +314,77 @@ impl<T: Default> ColumnMetrics<T> {
}
}
+#[derive(Debug, Clone, Copy)]
+pub(crate) enum LevelDataRef<'a> {
+ Absent,
+ Materialized(&'a [i16]),
+ Uniform { value: i16, count: usize },
+}
+
+impl<'a> LevelDataRef<'a> {
+ pub(crate) fn len(self) -> usize {
+ match self {
+ Self::Absent => 0,
+ Self::Materialized(values) => values.len(),
+ Self::Uniform { count, .. } => count,
+ }
+ }
+
+ pub(crate) fn first(self) -> Option<i16> {
+ match self {
+ Self::Absent => None,
+ Self::Materialized(values) => values.first().copied(),
+ Self::Uniform { value, count } => (count > 0).then_some(value),
+ }
+ }
+
+ #[cfg(feature = "arrow")]
+ pub(crate) fn value_at(self, idx: usize) -> Option<i16> {
+ match self {
+ Self::Absent => None,
+ Self::Materialized(values) => values.get(idx).copied(),
+ Self::Uniform { value, count } => (idx < count).then_some(value),
+ }
+ }
+
+ pub(crate) fn slice(self, offset: usize, len: usize) -> Self {
+ match self {
+ Self::Absent => Self::Absent,
+ Self::Materialized(values) =>
Self::Materialized(&values[offset..offset + len]),
+ Self::Uniform { value, .. } => Self::Uniform { value, count: len },
+ }
+ }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub(crate) enum ValueSelectionRef<'a> {
Review Comment:
See https://github.com/apache/arrow-rs/pull/9653#discussion_r3090016825
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