xushiyan commented on code in PR #5379:
URL: https://github.com/apache/hudi/pull/5379#discussion_r854734744
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hudi-client/hudi-spark-client/src/main/scala/org/apache/hudi/HoodieSparkUtils.scala:
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@@ -322,7 +323,9 @@ object HoodieSparkUtils extends SparkAdapterSupport {
val name2Fields = tableAvroSchema.getFields.asScala.map(f => f.name() ->
f).toMap
// Here have to create a new Schema.Field object
// to prevent throwing exceptions like
"org.apache.avro.AvroRuntimeException: Field already used".
- val requiredFields = requiredColumns.map(c => name2Fields(c))
+ // For a nested field, we include the root-level field
+ val requiredFields = requiredColumns.map(c =>
HoodieAvroUtils.getRootLevelFieldName(c))
+ .distinct.map(c => name2Fields(c))
Review Comment:
this code path affects both MOR and COW, right? is it for spark later to
drill down to specific nested cols?
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