danny0405 commented on code in PR #7752:
URL: https://github.com/apache/hudi/pull/7752#discussion_r1105614300
##########
hudi-common/src/main/java/org/apache/hudi/common/table/log/AbstractHoodieLogRecordReader.java:
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@@ -807,16 +809,17 @@ private ClosableIteratorWithSchema<HoodieRecord>
getRecordsIterator(
Option<Pair<Function<HoodieRecord, HoodieRecord>, Schema>>
schemaEvolutionTransformerOpt =
composeEvolvedSchemaTransformer(dataBlock);
+
// In case when schema has been evolved original persisted records will
have to be
// transformed to adhere to the new schema
- if (schemaEvolutionTransformerOpt.isPresent()) {
- return ClosableIteratorWithSchema.newInstance(
- new CloseableMappingIterator<>(blockRecordsIterator,
- schemaEvolutionTransformerOpt.get().getLeft()),
- schemaEvolutionTransformerOpt.get().getRight());
- } else {
- return ClosableIteratorWithSchema.newInstance(blockRecordsIterator,
dataBlock.getSchema());
- }
+ Function<HoodieRecord, HoodieRecord> transformer =
+ schemaEvolutionTransformerOpt.map(Pair::getLeft)
+ .orElse(Function.identity());
+
+ Schema schema = schemaEvolutionTransformerOpt.map(Pair::getRight)
+ .orElse(dataBlock.getSchema());
+
Review Comment:
The code looks clean but for use case when
`schemaEvolutionTransformerOpt.isPresent()` is false, there is unnecessary
invocation of `Function.identity()`.
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