voonhous commented on code in PR #17694:
URL: https://github.com/apache/hudi/pull/17694#discussion_r2645412461
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hudi-common/src/main/java/org/apache/hudi/common/schema/HoodieSchemaUtils.java:
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@@ -399,6 +410,32 @@ public static Option<Pair<String, HoodieSchemaField>>
getNestedField(HoodieSchem
/**
* Internal helper method for recursively retrieving nested fields.
*
+ * <p>Supports nested field access using dot notation including MAP and
ARRAY types
+ * using Parquet-style accessor patterns:</p>
+ *
+ * <ul>
+ * <li><b>RECORD types:</b> Standard dot notation (e.g., {@code
"user.profile.name"})</li>
Review Comment:
We do not have official public docs supporting this feature now. If users
were to select a nested (ARRAY/MAP) field as part of the column stats index
list, they'll need to follow this format to define the
`hoodie.metadata.index.column.stats.column.list` config.
If we follow through with this, this will need a doc.
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