AgensGraph 是一個基於 PostgreSQL 的新一代多模型圖資料庫。它提供圖形分析環境，使用者可以同時編寫、編輯和執行 SQL 和 Cypher 查詢。AgensGraph 帶有 PostgreSQL 相容性和 PostgreSQL 擴充套件，能夠幫助 PostgreSQL 使用者擺脫資料遷移的痛苦，輕鬆開發提供高階資料分析的服務。

AgensGraph 2.1 主要改進和修復：

• Performance Enhancement

• Cypher

• Enhance shortest-path algorithm and minor features

• Cypher Implemention

• Make all built-in functions usable

• Support "IN" for sub-queries

• Usability

• Improve Graph meta

• Add a GUC on graphmeta which decide it works automatically or not

• Add a function regather_graphmeta() which reset and gather graphmeta

• Add help command in agens shell

• Implement pre-evaluating CypherTypeCast

• Implement auto type casting on function call

• Implement auto type casting on operators

• jsonb to graphid -> numeric to graphid

• Handle UNKNOWNOID constants properly (::jsonb and ::text)

• Handle parameters AS-IS

• Change the implementation of constants

• Implement type casting

• Update comment about token precedence in gram.y

• Bug Fixes

• Please see the release notes for fix details

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