[GitHub] [spark] zhengruifeng commented on a diff in pull request #40456: [SPARK-42720][PS][SQL] Uses expression for distributed-sequence default index instead of plan

["zhengruifeng (via GitHub)" <gi...@apache.org>]

zhengruifeng commented on code in PR #40456:
URL: https://github.com/apache/spark/pull/40456#discussion_r1138370203


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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/DistributedSequenceID.scala:
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@@ -0,0 +1,42 @@
+/*
+ * 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.spark.sql.catalyst.expressions
+
+import org.apache.spark.sql.catalyst.trees.TreePattern.{DISTRIBUTED_SEQUENCE_ID, TreePattern}
+import org.apache.spark.sql.types.{DataType, LongType}
+
+/**
+ * Returns increasing 64-bit integers consecutive from 0.
+ * The generated ID is guaranteed to be increasing consecutive started from 0.
+ *
+ * @note this expression is dedicated for Pandas API on Spark to use.
+ */
+case class DistributedSequenceID() extends LeafExpression with Unevaluable with NonSQLExpression {

Review Comment:
   will it be `Nondeterministic` like `SparkPartitionID` and `MonotonicallyIncreasingID`?



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