update release notes (#1096)

* update release notes * Update releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update releasenote.md * Update docs-2.0/20.appendix/releasenote.md * Update releasenote.md * Update releasenote.md Co-authored-by: abby.huang <78209557+abby-cyber@users.noreply.github.com>
vesoft-inc · Feb 11, 2022 · 4d469b6 · 4d469b6
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 # Nebula Graph {{ nebula.release }} release notes
 
-## Bug fix
+## Feature
 
-Fixed the bug that the nebula connection will be interrupted if the YIELD clause in LOOKUP contains aggregate functions.[#3245](https://github.com/vesoft-inc/nebula/pull/3245)
+- Support [Backup and Restore](../7.data-security/2.backup-restore/1.what-is-br.md). [#3469](https://github.com/vesoft-inc/nebula/pull/3469) [#1](https://github.com/vesoft-inc/nebula-agent/pull/1) [#22](https://github.com/vesoft-inc/nebula-br/pull/22)
 
+- Support [openCypher queries with multiple MATCH statements](../3.ngql-guide/7.general-query-statements/2.match.md). [#3519](https://github.com/vesoft-inc/nebula/pull/3519) [#3318](https://github.com/vesoft-inc/nebula/pull/3318)
+
+- Support the Traverse operator. [#3308](https://github.com/vesoft-inc/nebula/pull/3308)
+
+- Support [Standalone Nebula Graph](../4.deployment-and-installation/standalone-deployment.md). [#3310](https://github.com/vesoft-inc/nebula/pull/3310)
+
+- Support [key-value separation for the storage engine](../5.configurations-and-logs/1.configurations/4.storage-config.md). [#3281](https://github.com/vesoft-inc/nebula/pull/3281)
+
+- Support topN pushdown for `LOOKUP`. [#3499](https://github.com/vesoft-inc/nebula/pull/3499)
+
+- Support [vertices without tags](../3.ngql-guide/12.vertex-statements/1.insert-vertex.md). [#3316](https://github.com/vesoft-inc/nebula/pull/3316) [#3335](https://github.com/vesoft-inc/nebula/pull/3335) [#3328](https://github.com/vesoft-inc/nebula/pull/3328) [#3286](https://github.com/vesoft-inc/nebula/pull/3286)
+
+- Support [parameterized queries](../nebula-console.md). [#3379](https://github.com/vesoft-inc/nebula/pull/3379)
+
+- Support [queries without specifying VIDs but a `LIMIT` clause must be used to restrict the number of results](../3.ngql-guide/7.general-query-statements/2.match.md) [#3320](https://github.com/vesoft-inc/nebula/pull/3320) [#3329](https://github.com/vesoft-inc/nebula/pull/3329) [#3262](https://github.com/vesoft-inc/nebula/pull/3262)
+
+- Support [duration](../3.ngql-guide/3.data-types/4.date-and-time.md). [#3338](https://github.com/vesoft-inc/nebula/pull/3338)
+
+- Support [schema with Chinese characters](../3.ngql-guide/1.nGQL-overview/keywords-and-reserved-words.md). [#3380](https://github.com/vesoft-inc/nebula/pull/3380)  [#3440](https://github.com/vesoft-inc/nebula/pull/3440)
+
+- Support [DESCRIBE USER](../7.data-security/1.authentication/2.management-user.md). [#3300](https://github.com/vesoft-inc/nebula/pull/3300)
+
+<!--
+- 支持Snowflake IDs。 [#3500](https://github.com/vesoft-inc/nebula/pull/3500)
+-->
+
+## Enhancement
+
+- Refactor cluster management. [#3343](https://github.com/vesoft-inc/nebula/pull/3343)
+
+- Add log monitor to check free bytes for log disks, change log level when your graph space is almost full. [#3576](https://github.com/vesoft-inc/nebula/pull/3576)
+
+- Upgrade the third-party library version to 3.0. [#3554](https://github.com/vesoft-inc/nebula/pull/3554) [#3511](https://github.com/vesoft-inc/nebula/pull/3511)
+
+- Support any string for tag names in apostrophe. [#3424](https://github.com/vesoft-inc/nebula/pull/3424)
+
+- Support that the storage service sends partition disk paths to the meta. [#3369](https://github.com/vesoft-inc/nebula/pull/3369) [#3416](https://github.com/vesoft-inc/nebula/pull/3416)
+
+- Add constraints on invalid password attempts. [#3573](https://github.com/vesoft-inc/nebula/pull/3573) [#3629](https://github.com/vesoft-inc/nebula/pull/3629)
+
+- Support `DELETE` in TOSS. [#3374](https://github.com/vesoft-inc/nebula/pull/3374)
+
+- Support logrotate. [#3541](https://github.com/vesoft-inc/nebula/pull/3541)
+
+- Support more metrics. [#3446](https://github.com/vesoft-inc/nebula/pull/3446) [#3605](https://github.com/vesoft-inc/nebula/pull/3605) [#3590](https://github.com/vesoft-inc/nebula/pull/3590)
+
+- Support property functions in the `WHERE` clause of `GO` statements. [#3443](https://github.com/vesoft-inc/nebula/pull/3443)
+
+- Enhancement date and time parser. [#3179](https://github.com/vesoft-inc/nebula/pull/3179)
+
+- Remove read lock in the meta service to reduce the side effect of read-write locks. [#3256](https://github.com/vesoft-inc/nebula/pull/3256)
+
+- Refactor storage indexes to solve the coupling problem between services. [#3196](https://github.com/vesoft-inc/nebula/pull/3196)
+
+- Support specifying the floating point accuracy of the `round()` function. [#3178](https://github.com/vesoft-inc/nebula/pull/3178)ß
+
+- Support HTTPS for the ES client. [#3150](https://github.com/vesoft-inc/nebula/pull/3150)
+
+- Move version info outside of heartbeat.  [#3378](https://github.com/vesoft-inc/nebula/pull/3378)
+
+- Support empty list, set, and map. [#3302](https://github.com/vesoft-inc/nebula/pull/3302)
+
+- Support specifying s2 region coverage parameters when creating a geo index. [#3396](https://github.com/vesoft-inc/nebula/pull/3396)
+
+- Add version info for `SHOW HOSTS`. [#3702](https://github.com/vesoft-inc/nebula/pull/3702)
+
+## Bugfix
+
+- Fix the bug that memory is not released when a default value is used and no value is specified in nGQL. [#3666](https://github.com/vesoft-inc/nebula/pull/3666)
+
+- Fix the bug that the function `coalesce()` cannot be used. [#3653](https://github.com/vesoft-inc/nebula/pull/3653)
+
+- Fix the bug that using multiple INSERT on an indexed tag will lead to incorrect LOOKUP results. [#3627](https://github.com/vesoft-inc/nebula/pull/3627)
+
+- Fix the crash when the expression exceeds the depth. [#3606](https://github.com/vesoft-inc/nebula/pull/3606)
+
+- Disable the aggregate function in the `YIELD` and `WHERE` clauses of nGQL. [#3597](https://github.com/vesoft-inc/nebula/pull/3597)
+
+- Fix the crash when using the aggregate function in `UNWILD` and `WHERE` clauses. [#3397](https://github.com/vesoft-inc/nebula/pull/3397) [#3355](https://github.com/vesoft-inc/nebula/pull/3355)
+
+- Fix the bug that the tag index is rebuilt with an old schema version value. [#3332](https://github.com/vesoft-inc/nebula/pull/3332)
+
+- Fix the bug that the query results will still contain the expired edges if we use `GO...REVERSELY`. [#3536](https://github.com/vesoft-inc/nebula/pull/3536)
+
+- Fix the memory estimation error info in CentOS 6.0. [#3534](https://github.com/vesoft-inc/nebula/pull/3534)
+
+- Fix the crash when the `LOOKUP` statement contains a filter that consists of a logical And expression and an IN expression with only one element. [#3525](https://github.com/vesoft-inc/nebula/pull/3525)
+
+- Fix the bug that metad progress is suspended under heavy load. [#3482](https://github.com/vesoft-inc/nebula/pull/3482)
+
+- Fix the unwinding subgraph crash. [#3506](https://github.com/vesoft-inc/nebula/pull/3506)
+
+- Fix the `DROP SPACE` crash when rebuilding an index. [#3406](https://github.com/vesoft-inc/nebula/pull/3406)
+
+- Fix the bug of reading memory stats under cgroup v2. [#3419](https://github.com/vesoft-inc/nebula/pull/3419)
+
+- Fix the bug that `DROP TAG INDEX` deletes the edge index with the same name unexpectedly, and vice versa for the deletion of the tag index. [#3413](https://github.com/vesoft-inc/nebula/pull/3413)
+
+- Fix the bug that edges are not shown after a graph space is cloned. [#3351](https://github.com/vesoft-inc/nebula/pull/3351)
+
+- Fix the index existence check problem. [#3315](https://github.com/vesoft-inc/nebula/pull/3315)
+
+- Fix a bug that running the `ALTER` statement to query the type property may lead to a null pointer obtained by the graph service. [#3325](https://github.com/vesoft-inc/nebula/pull/3325)
+
+- Optimized the Raft to make the system more stable. [#3172](https://github.com/vesoft-inc/nebula/pull/3172) [#3435](https://github.com/vesoft-inc/nebula/pull/3435) [#3358](https://github.com/vesoft-inc/nebula/pull/3358) [#3322](https://github.com/vesoft-inc/nebula/pull/3322) [#3031](https://github.com/vesoft-inc/nebula/pull/3031)
+
+- Cancel memory check when the ratio is greater than 1.0. [#3289](https://github.com/vesoft-inc/nebula/pull/3289)
+
+- Fix building with ninja error. [#3195](https://github.com/vesoft-inc/nebula/pull/3195)
+
+- Fix the bug that creating tag and edge with the same name at the same time may both succeed. [#3735](https://github.com/vesoft-inc/nebula/pull/3735)
+
+- Fix the full-text index creation failure when there are the same tags or edges in different spaces. [#3747](https://github.com/vesoft-inc/nebula/pull/3747)
+
+- Fix variable inconsistency in `YIELD` clauses and `GO` statements. [#3430](https://github.com/vesoft-inc/nebula/pull/3430)
+
+## Incompatibility
+
+Nebula Graph {{ nebula.release }} does not support the most ecosystem tools of v2.x, please upgrade the [ecosystem tools](6.eco-tool-version.md).
+
+- The storage services added in the configuration files cannot be read or written directly. The configuration files only register the storage services into the meta services. You must run the `ADD HOSTS` command to read and write data on storage servers. [#3343](https://github.com/vesoft-inc/nebula/pull/3343)
+
+- Disable ZONE and GROUP. [#3776](https://github.com/vesoft-inc/nebula/pull/3776) [#3825](https://github.com/vesoft-inc/nebula/pull/3825)  [#3330](https://github.com/vesoft-inc/nebula/pull/3330)
+
+- Disable `BALANCE DATA`.  [#3756](https://github.com/vesoft-inc/nebula/pull/3756)
+
+- Modify the default session timeout from `0` to `28800` seconds, limit the value to between `1` and `604800` seconds. [#3357](https://github.com/vesoft-inc/nebula/pull/3357) [#3807](https://github.com/vesoft-inc/nebula/pull/3807)
+
+- Add `SHOW LOCAL SESSIONS` and `SHOW LOCAL QUERIES` commands, and deprecate `SHOW ALL QUERIES`. [#3488](https://github.com/vesoft-inc/nebula/pull/3488)
+
+- A tag is not required for a vertex. `DELETE VERTEX` only deletes the vertices and does not delete the related outgoing and incoming edges of the vertices. At this time, there will be hanging edges by default. [#3316](https://github.com/vesoft-inc/nebula/pull/3316) [#3335](https://github.com/vesoft-inc/nebula/pull/3335) [#3328](https://github.com/vesoft-inc/nebula/pull/3328) [#3286](https://github.com/vesoft-inc/nebula/pull/3286)
+
+- Disable the `YIELD` clause to return custom variables. [#3271](https://github.com/vesoft-inc/nebula/pull/3271)
+
+- The `YIELD` clause is required in the `FETCH`, `GO`, `LOOKUP`, `FIND PATH` and `GET SUBGRAPH` statements. [#2957](https://github.com/vesoft-inc/nebula/pull/2957) [#3056](https://github.com/vesoft-inc/nebula/pull/3056) [#3139](https://github.com/vesoft-inc/nebula/pull/3139)
+
+- Add non-reserved keywords: `s2_max_level`, `s2_max_cells`. [#3396](https://github.com/vesoft-inc/nebula/pull/3396)
+
+- It is required to specify a tag to query properties of a vertex in a `MATCH` statement. For example, from `return v.name` to `return v.player.name`. [#3255](https://github.com/vesoft-inc/nebula/pull/3255)
 ## Legacy versions
 
 [Release notes of legacy versions](https://nebula-graph.com.cn/tags/release-note/)