hudi-agent commented on code in PR #18723:
URL: https://github.com/apache/hudi/pull/18723#discussion_r3309658601


##########
hudi-common/src/main/java/org/apache/hudi/common/util/HoodieVectorUtils.java:
##########
@@ -0,0 +1,110 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hudi.common.util;
+
+import org.apache.hudi.common.schema.HoodieSchema;
+import org.apache.hudi.common.schema.HoodieSchemaField;
+import org.apache.hudi.common.schema.HoodieSchemaType;
+
+import java.nio.ByteBuffer;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Utilities for decoding Hudi VECTOR fixed-bytes payloads.
+ */
+public final class HoodieVectorUtils {
+
+  private HoodieVectorUtils() {
+  }
+
+  /**
+   * Detects VECTOR columns in a HoodieSchema record and returns a map of 
field ordinal
+   * to the corresponding {@link HoodieSchema.Vector} schema.
+   *
+   * @param schema a HoodieSchema of type RECORD (or null)
+   * @return map from field index to Vector schema; empty map if schema is 
null or has no vectors
+   */
+  public static Map<Integer, HoodieSchema.Vector> 
detectVectorColumns(HoodieSchema schema) {
+    Map<Integer, HoodieSchema.Vector> vectorColumnInfo = new LinkedHashMap<>();
+    if (schema == null) {
+      return vectorColumnInfo;
+    }
+    List<HoodieSchemaField> fields = schema.getFields();
+    for (int i = 0; i < fields.size(); i++) {
+      HoodieSchema fieldSchema = fields.get(i).schema().getNonNullType();
+      if (fieldSchema.getType() == HoodieSchemaType.VECTOR) {
+        vectorColumnInfo.put(i, (HoodieSchema.Vector) fieldSchema);
+      }
+    }

Review Comment:
   🤖 nit: the `@return` here (and on the second `decodeVectorBytes` overload 
below) says "an ArrayData containing the decoded float[], double[], or byte[] 
array," but the method returns the raw primitive array (`Object` boxing a 
`float[]`/`double[]`/`byte[]`), not an `ArrayData`. Could you update the doc to 
match — e.g. "the decoded primitive array (`float[]`, `double[]`, or `byte[]`)"?
   
   <sub><i>- AI-generated; verify before applying. React 👍/👎 to flag 
quality.</i></sub>



##########
hudi-client/hudi-flink-client/src/main/java/org/apache/hudi/util/AvroToRowDataConverters.java:
##########
@@ -78,16 +82,55 @@ public interface AvroToRowDataConverter extends 
Serializable {
   // 
-------------------------------------------------------------------------------------
   // Runtime Converters
   // 
-------------------------------------------------------------------------------------
+
+  /**
+   * Creates a row converter from the Flink row type using UTC timezone 
conversion.
+   *
+   * <p>Note that this RowType-only path cannot recover Hoodie-specific 
logical type metadata
+   * that is not represented in Flink's {@link RowType}.
+   */
   public static AvroToRowDataConverter createRowConverter(RowType rowType) {
     return createRowConverter(rowType, true);
   }
 
+  /**
+   * Creates a row converter from the Flink row type.
+   *
+   * <p>Note that this RowType-only path cannot recover Hoodie-specific 
logical type metadata
+   * that is not represented in Flink's {@link RowType}.
+   */
   public static AvroToRowDataConverter createRowConverter(RowType rowType, 
boolean utcTimezone) {
-    final AvroToRowDataConverter[] fieldConverters =
-        rowType.getFields().stream()
-            .map(RowType.RowField::getType)
-            .map(type -> AvroToRowDataConverters.createNullableConverter(type, 
utcTimezone))
-            .toArray(AvroToRowDataConverter[]::new);
+    return createRowConverter(HoodieSchemaConverter.convertToSchema(rowType), 
rowType, utcTimezone);
+  }
+
+  /**
+   * Creates a row converter using only the Flink row type.

Review Comment:
   🤖 nit: this javadoc says "using only the Flink row type" but the method 
actually takes only a `HoodieSchema` (deriving the `RowType` from it) — could 
you flip the wording to something like "Creates a row converter using only the 
Hoodie schema"? The current text is the opposite of what the method does and is 
easy to misread.
   
   <sub><i>- AI-generated; verify before applying. React 👍/👎 to flag 
quality.</i></sub>



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