jerryshao commented on code in PR #8229:
URL: https://github.com/apache/gravitino/pull/8229#discussion_r2309098710
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docs/manage-statistics-in-gravitino.md:
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+---
+title: "Manage statistics in Gravitino"
+slug: /manage-statistics-in-gravitino
+date: 2025-08-21
+keyword: statistics management, statistics, statistic, Gravitino
+license: This software is licensed under the Apache License version 2.
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+## Introduction
+
+Starting from 1.0.0, Gravitino introduces statistics of tables and partitions.
+
+This document provides a brief introduction using both Gravitino Java client
and
+REST APIs. If you want to know more about the statistics system in Gravitino,
please refer to the
+Javadoc and REST API documentation.
+
+Statistics only support the custom statistics, which names must start with
`custom-`.
+Gravitino will support built-in statistics in the future.
+
+The query engine uses statistics for cost-based optimization (CBO). Meanwhile,
statistics can also
+be used for metadata action systems to trigger some jobs, such as compaction,
data archiving, etc.
+
+You can define statistics and add policies based on the statistics. Users can
analyze the statistics
+and policy to decide the next action.
+
+Currently, Gravitino doesn't handle the computation of the statistics, you
need to compute the statistics
+and update them to Gravitino. Gravitino can't judge the expiration of the
statistics,
+You need to ensure the statistics are up-to-date.
+
+
+## Metadata object statistic operations
+
+### Update statistics of metadata objects
+
+You can update the statistics of a metadata object by providing the statistics
key and value.
+Now only table statistics can be updated.
+
+The request path for REST API is
`/api/metalakes/{metalake}/objects/{metadataObjectType}/{metadataObjectName}/statistics`.
+
+<Tabs groupId='language' queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X PUT -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" -d '{
+ "updates" : {
+ "custom-tableLastModifiedTime": "20250128",
+ }
+}'
http://localhost:8090/api/metalakes/metalake/objects/table/catalog.schema.table/statistics
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+Table table = ...
+Map<String, StatisticValue<?>> updateStatistics = Maps.newHashMap();
+updateStatistics.put("custom-k1", StatisticValues.stringValue("v1"));
+updateStatistics.put("custom-k2", StatisticValues.stringValue("v2"));
+table.updateStatistics(updateStatistics);
+```
+
+</TabItem>
+</Tabs>
+
+### List statistics of metadata objects
+
+You can list all the statistics of a metadata object.
+Now only table statistics can be listed.
+
+The request path for REST API is
`/api/metalakes/{metalake}/objects/{metadataObjectType}/{metadataObjectName}/statistics`.
+
+<Tabs groupId='language' queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X GET -H "Accept: application/vnd.gravitino.v1+json" \
+ -H "Content-Type: application/json" \
+
http://localhost:8090/api/metalakes/metalake/objects/table/catalog.schema.table/statistics
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+Table table = ...
+table.listStatistics();
+```
+
+</TabItem>
+</Tabs>
+
+### Drop statistics of metadata objects
+
+You can drop the statistics of a metadata object by providing the statistics
keys.
+Now only table statistics can be dropped.
+
+The request path for REST API is
`/api/metalakes/{metalake}/objects/{metadataObjectType}/{metadataObjectName}/statistics`.
+
+<Tabs groupId='language' queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X POST -H "Accept: application/vnd.gravitino.v1+json" \
+ -H "Content-Type: application/json" -d '{
+ "names":["custom-k1"]
+}'
http://localhost:8090/api/metalakes/metalake/objects/table/catalog.schema.table/statistics
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+Table table = ...
+List<String> statisticsToDrop = Lists.newArrayList("custom-k1");
+table.dropStatistics(statisticsToDrop);
+```
+
+</TabItem>
+</Tabs>
+
+### Partition statistics operations
+
+### Update statistics of partitions
+
+You can update the statistics of a partition by providing the statistics key
and value. If the statistics
+already exist, it will be updated; otherwise, a new statistic will be created.
+
+The request path for REST API is
`/api/metalakes/{metalake}/objects/table/{metadataObjectName}/statistics/partitions`.
+
+<Tabs groupId='language' queryString>
+<TabItem value="shell" label="Shell">
+
+```shell
+curl -X PUT -H "Accept: application/vnd.gravitino.v1+json" \
+-H "Content-Type: application/json" -d '{
+ "updates":[{
+ "partitionName" : "p0" ,
+ "statistics" : {
+ "custom-k1" : "v1"
+ }
+ }]
+}'
http://localhost:8090/api/metalakes/metalake/objects/table/catalog.schema.table/statistics/partitions
+```
+
+</TabItem>
+<TabItem value="java" label="Java">
+
+```java
+Table table = ...
+List<PartitionStatisticsUpdate> statisticsToUpdate = Lists.newArrayList();
+Map<String, StatisticValue<?>> stats = Maps.newHashMap();
+stats.put("custom-k1", StatisticValues.stringValue("v1"));
+stats.put("custom-k2", StatisticValues.stringValue("v2"));
+statisticsToUpdate.add(PartitionStatisticsModification.update("p1", stats));
+table.updatePartitionStatistics(statisticsToUpdate);
+```
+
+</TabItem>
+</Tabs>
+
+
+### List statistics of partitions
+
+You can list the statistics of specified partitions.
+You can specify a range of partitions by providing the `from` and `to`
parameters,
+and whether the range is inclusive or , not using `fromInclusive` and
`toInclusive` parameters.
Review Comment:
"inclusive or not..."
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