dongjoon-hyun commented on a change in pull request #24851: [SPARK-27303][GRAPH] Add Spark Graph API URL: https://github.com/apache/spark/pull/24851#discussion_r333814672
########## File path: graph/api/src/main/scala/org/apache/spark/graph/api/CypherSession.scala ########## @@ -0,0 +1,186 @@ +/* + * 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.graph.api + +import scala.collection.JavaConverters._ + +import org.apache.spark.sql.{DataFrame, SaveMode, SparkSession} + +object CypherSession { + val ID_COLUMN = "$ID" + val SOURCE_ID_COLUMN = "$SOURCE_ID" + val TARGET_ID_COLUMN = "$TARGET_ID" + val LABEL_COLUMN_PREFIX = ":" +} + +/** + * The entry point for using property graphs in Spark. + * + * Provides factory methods for creating [[PropertyGraph]] instances. + * + * Wraps a [[org.apache.spark.sql.SparkSession]]. + * + * @since 3.0.0 + */ +trait CypherSession { + + def sparkSession: SparkSession + + /** + * Executes a Cypher query on the given input graph. + * + * @param graph [[PropertyGraph]] on which the query is executed + * @param query Cypher query to execute + * @since 3.0.0 + */ + def cypher(graph: PropertyGraph, query: String): CypherResult + + /** + * Executes a Cypher query on the given input graph. + * + * @param graph [[PropertyGraph]] on which the query is executed + * @param query Cypher query to execute + * @param parameters parameters used by the Cypher query + * @since 3.0.0 + */ + def cypher(graph: PropertyGraph, query: String, parameters: Map[String, Any]): CypherResult + + /** + * Executes a Cypher query on the given input graph. + * + * @param graph [[PropertyGraph]] on which the query is executed + * @param query Cypher query to execute + * @param parameters parameters used by the Cypher query + * @since 3.0.0 + */ + def cypher(graph: PropertyGraph, + query: String, + parameters: java.util.Map[String, Object]): CypherResult = { + cypher(graph, query, parameters.asScala.toMap) + } + + /** + * Creates a [[PropertyGraph]] from a sequence of [[NodeFrame]]s and [[RelationshipFrame]]s. + * At least one [[NodeFrame]] has to be provided. + * + * For each label set and relationship type there can be at most one [[NodeFrame]] and at most one + * [[RelationshipFrame]], respectively. + * + * @param nodes NodeFrames that define the nodes in the graph + * @param relationships RelationshipFrames that define the relationships in the graph + * @since 3.0.0 + */ + def createGraph(nodes: Seq[NodeFrame], relationships: Seq[RelationshipFrame]): PropertyGraph + + /** + * Creates a [[PropertyGraph]] from a sequence of [[NodeFrame]]s and [[RelationshipFrame]]s. + * At least one [[NodeFrame]] has to be provided. + * + * For each label set and relationship type there can be at most one [[NodeFrame]] and at most one + * [[RelationshipFrame]], respectively. + * + * @param nodes NodeFrames that define the nodes in the graph + * @param relationships RelationshipFrames that define the relationships in the graph + * @since 3.0.0 + */ + def createGraph( + nodes: java.util.List[NodeFrame], + relationships: java.util.List[RelationshipFrame]): PropertyGraph = { + createGraph(nodes.asScala, relationships.asScala) + } + + /** + * Creates a [[PropertyGraph]] from nodes and relationships. + * + * The given DataFrames need to adhere to the following column naming conventions: + * + * {{{ + * Id column: `$ID` (nodes and relationships) + * SourceId column: `$SOURCE_ID` (relationships) + * TargetId column: `$TARGET_ID` (relationships) + * + * Label columns: `:{LABEL_NAME}` (nodes) + * RelType columns: `:{REL_TYPE}` (relationships) + * + * Property columns: `{Property_Key}` (nodes and relationships) + * }}} + * + * @see [[CypherSession]] + * @param nodes node DataFrame + * @param relationships relationship DataFrame + * @since 3.0.0 + */ + def createGraph(nodes: DataFrame, relationships: DataFrame): PropertyGraph = { Review comment: ```scala - def createGraph(nodes: DataFrame, relationships: DataFrame): PropertyGraph = { + def createGraph(nodes: Dataset[Row], relationships: Dataset[Row]): PropertyGraph = { ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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