ewoodbury commented on code in PR #3255:
URL: https://github.com/apache/iceberg-rust/pull/3255#discussion_r4226890399
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crates/iceberg/src/arrow/record_batch_transformer.rs:
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@@ -193,6 +195,296 @@ pub(crate) enum ColumnSource {
// post-processing step by using the projection mask.
}
+/// Reconciles a source array to the target type by matching nested fields on
+/// field id rather than position, mirroring iceberg-java's nested readers.
+///
+/// The plan is resolved once per file, when the `BatchTransform` is built, so
+/// applying it per batch is just index lookups and array assembly.
+#[derive(Debug)]
+pub(crate) enum PromotePlan {
+ PassThrough,
+ Cast(DataType),
+ Struct {
+ fields: Fields,
+ children: Vec<ChildPlan>,
+ },
+ List {
+ field: FieldRef,
+ element: Box<PromotePlan>,
+ },
+ Map {
+ field: FieldRef,
+ entry_fields: Fields,
+ entries: Vec<ChildPlan>,
+ sorted: bool,
+ },
+}
+
+#[derive(Debug)]
+pub(crate) enum ChildPlan {
+ FromSource {
+ source_index: usize,
+ plan: PromotePlan,
+ },
+ Constant {
+ target_type: DataType,
+ value: PrimitiveLiteral,
+ },
+ Null {
+ target_type: DataType,
+ },
Review Comment:
Done in same commit. Both are now `ChildPlan::Add { target_type, value:
Option<PrimitiveLiteral> }`, applied through `create_column`, and the
`new_null_array` import and Null arm are gone.
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