singhpk234 commented on code in PR #15268:
URL: https://github.com/apache/iceberg/pull/15268#discussion_r2785164854
##########
spark/v4.1/spark/src/main/java/org/apache/iceberg/spark/source/BaseReader.java:
##########
@@ -252,5 +251,40 @@ protected <V> V getOrLoad(String key, Supplier<V>
valueSupplier, long valueSize)
return cache.getOrLoad(table().name(), key, valueSupplier, valueSize);
}
}
+
+ // field lookup for serializable tables that assumes fetching historic
schemas is expensive
+ private static class FieldLookup implements Function<Integer,
Types.NestedField> {
+ private final Table table;
+
+ private volatile Map<Integer, Types.NestedField> historicSchemaFields;
+
+ private FieldLookup(Table table) {
+ this.table = table;
+ }
+
+ @Override
+ public Types.NestedField apply(Integer id) {
+ Types.NestedField field = table.schema().findField(id);
+ return field != null ? field : historicSchemaFields().get(id);
+ }
+
+ private Map<Integer, Types.NestedField> historicSchemaFields() {
+ if (historicSchemaFields == null) {
+ synchronized (this) {
+ if (historicSchemaFields == null) {
+ this.historicSchemaFields =
Schema.indexFields(historicSchemas(table));
+ }
+ }
+ }
+
+ return historicSchemaFields;
+ }
+
+ private static Collection<Schema> historicSchemas(Table table) {
+ return table.schemas().values().stream()
+ .filter(schema -> schema.schemaId() != table.schema().schemaId())
+ .collect(Collectors.toList());
+ }
+ }
Review Comment:
> I don't think this is something to concern ourselves with for the 1.11
release
I am on the same page :), just posted here as an FYI, since there has been
some discussions about it !
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