danny0405 commented on code in PR #19665:
URL: https://github.com/apache/hudi/pull/19665#discussion_r3826906898


##########
hudi-spark-datasource/hudi-spark/src/test/scala/org/apache/hudi/functional/TestCOWDataSource.scala:
##########
@@ -1979,35 +1980,39 @@ class TestCOWDataSource extends 
HoodieSparkClientTestBase with ScalaAssertionSup
       HoodieWriteConfig.KEYGENERATOR_CLASS_NAME.key() -> 
"org.apache.hudi.keygen.ComplexKeyGenerator",
       KeyGeneratorOptions.HIVE_STYLE_PARTITIONING_ENABLE.key() -> "true",
       HiveSyncConfigHolder.HIVE_SYNC_ENABLED.key() -> "false",
-      HoodieWriteConfig.RECORD_MERGE_IMPL_CLASSES.key() -> 
"org.apache.hudi.DefaultSparkRecordMerger"
+      HoodieWriteConfig.RECORD_MERGE_IMPL_CLASSES.key() -> 
"org.apache.hudi.DefaultSparkRecordMerger",
+      HoodieCommonConfig.RECONCILE_SCHEMA.key() -> "true",

Review Comment:
   Addressed in `4ed8c66ff60a`. The functional test now parameterizes both 
`hoodie.datasource.write.reconcile.schema` and schema-on-read and covers all 
four combinations. `hoodie.datasource.write.reconcile.schema=true` is not 
required: all four cases pass, confirming that new-field nullability is applied 
during canonicalization before either reconciliation path is selected.



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