yihua commented on a change in pull request #4520: URL: https://github.com/apache/hudi/pull/4520#discussion_r785674002
########## File path: hudi-spark-datasource/hudi-spark/src/main/scala/org/apache/hudi/AbstractHoodieTableFileIndex.scala ########## @@ -0,0 +1,309 @@ +/* + * 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 + +import org.apache.hadoop.fs.{FileStatus, Path} +import org.apache.hudi.DataSourceReadOptions.{QUERY_TYPE, QUERY_TYPE_SNAPSHOT_OPT_VAL} +import org.apache.hudi.common.config.{HoodieMetadataConfig, TypedProperties} +import org.apache.hudi.common.engine.HoodieEngineContext +import org.apache.hudi.common.fs.FSUtils +import org.apache.hudi.common.model.FileSlice +import org.apache.hudi.common.model.HoodieTableType.MERGE_ON_READ +import org.apache.hudi.common.table.HoodieTableMetaClient +import org.apache.hudi.common.table.view.{FileSystemViewStorageConfig, HoodieTableFileSystemView} + +import scala.collection.JavaConversions._ +import scala.collection.JavaConverters._ +import scala.collection.mutable + +/** + * A file index which support partition prune for hoodie snapshot and read-optimized query. + * + * Main steps to get the file list for query: + * 1、Load all files and partition values from the table path. + * 2、Do the partition prune by the partition filter condition. + * + * There are 3 cases for this: + * 1、If the partition columns size is equal to the actually partition path level, we + * read it as partitioned table.(e.g partition column is "dt", the partition path is "2021-03-10") + * + * 2、If the partition columns size is not equal to the partition path level, but the partition + * column size is "1" (e.g. partition column is "dt", but the partition path is "2021/03/10" + * who's directory level is 3).We can still read it as a partitioned table. We will mapping the + * partition path (e.g. 2021/03/10) to the only partition column (e.g. "dt"). + * + * 3、Else the the partition columns size is not equal to the partition directory level and the + * size is great than "1" (e.g. partition column is "dt,hh", the partition path is "2021/03/10/12"), + * we read it as a Non-Partitioned table because we cannot know how to mapping the partition + * path with the partition columns in this case. + * + */ +abstract class AbstractHoodieTableFileIndex(engineContext: HoodieEngineContext, Review comment: Let's use `Base` as the prefix for abstract classes as well, since they have common functionality, and dev knows the class is abstract by keyword? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@hudi.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
