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Posted to issues@iceberg.apache.org by "flyrain (via GitHub)" <gi...@apache.org> on 2023/03/14 16:47:23 UTC

[GitHub] [iceberg] flyrain commented on a diff in pull request #7105: Docs: Add partition stats spec

flyrain commented on code in PR #7105:
URL: https://github.com/apache/iceberg/pull/7105#discussion_r1135890688


##########
format/partition-statistics-spec.md:
##########
@@ -0,0 +1,43 @@
+---
+title: "Partition Statistics Spec"
+url: partition-statistics-spec
+toc: true
+disableSidebar: true
+---
+<!--
+ - 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.
+ -->
+
+# Partition Statistics file format
+
+This is a specification for partition statistics files. It is designed to store statistics information 
+for every partition value as a row in the **table default format** sorted based on the `partition`.
+
+The schema of the file is as follows:
+
+| Field Id | Field Name              | Field Type   | isOptional | Doc                                                                                                                         |
+|----------|-------------------------|--------------|------------|-----------------------------------------------------------------------------------------------------------------------------|
+| 1        | partition               | StructType   | false      | See [PartitionData](https://github.com/apache/iceberg/blob/master/core/src/main/java/org/apache/iceberg/PartitionData.java) |                                                                                  
+| 2        | spec_id                 | IntegerType  | false      | partition spec id                                                                                                           |
+| 3        | data_record_count       | LongType     | false      | Count of records in data files                                                                                              |                                               
+| 4        | data_file_count         | IntegerType  | false      | Count of data files                                                                                                         |
+| 5        | pos_delete_record_count | LongType     | false      | Count of records in position delete files                                                                                   |                                                          
+| 6        | pos_delete_file_count   | IntegerType  | false      | Count of position delete files                                                                                              |                                   
+| 7        | eq_delete_record_count  | LongType     | false      | Count of records in equality delete files                                                                                   |                                  
+| 8        | eq_delete_file_count    | IntegerType  | false      | Count of equality delete files                                                                                              |                                

Review Comment:
   Should these be optional since v1 tables do have them?



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