xiangfu0 commented on code in PR #18973:
URL: https://github.com/apache/pinot/pull/18973#discussion_r3563475060
##########
pinot-plugins/pinot-input-format/pinot-avro-base/src/test/java/org/apache/pinot/plugin/inputformat/avro/AvroSchemaUtilTest.java:
##########
@@ -60,6 +58,17 @@ public void
testToAvroSchemaJsonObjectRejectsUnsupportedType() {
() -> AvroSchemaUtil.toAvroSchemaJsonObject(new
DimensionFieldSpec("col", DataType.BIG_DECIMAL, true)));
}
+ /// A UUID column is represented faithfully as an Avro string annotated with
logicalType "uuid". The recommender
+ /// pipeline only ever emits single-value fields (see
`DataGenerator#buildSpec`), matching every sibling case.
Review Comment:
Reworded to avoid implying the generated values are always single-valued:
the comment now says `DataGenerator#buildSpec` marks the recommender schema
FieldSpec single-value (not the data values), which is why
`toAvroSchemaJsonObject` emits a scalar union like every sibling type.
_🤖 Addressed by [Claude Code](https://claude.com/claude-code)_
##########
pinot-controller/src/main/java/org/apache/pinot/controller/recommender/data/generator/UuidGenerator.java:
##########
@@ -0,0 +1,75 @@
+/**
+ * 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.pinot.controller.recommender.data.generator;
+
+import com.google.common.annotations.VisibleForTesting;
+import java.util.Random;
+import java.util.UUID;
+
+
+/// Generates canonical RFC-4122 UUID strings for a column of type UUID. UUID
is a logical type whose recommender Avro
+/// schema is a `string` annotated with `logicalType: uuid` (see
`AvroSchemaUtil#toAvroSchemaJsonObject`), so the
+/// generated value is the canonical string form and the writer serializes it
directly.
+///
+/// The number of distinct values is bounded by the requested cardinality: a
fixed random high-order half is combined
+/// with a low-order counter that cycles `[1, cardinality]`, mirroring
`StringGenerator`. Values are not RFC-4122
+/// version-4 (the version/variant bits are not set), which is irrelevant for
sample data — they remain
+/// canonically-formatted, parseable UUID strings.
Review Comment:
Reworded to remove the contradiction: dropped the "RFC-4122" claim from the
first line, and the javadoc now states these are deliberately not RFC-4122
version-4 UUIDs (version/variant bits unset). Sample data only needs distinct,
canonically-formatted, parseable values, so I kept the reword rather than
setting the bits.
_🤖 Addressed by [Claude Code](https://claude.com/claude-code)_
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