[shardingsphere] branch master updated: Update parse.en.md (#7977)

[pa...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

panjuan pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/shardingsphere.git


The following commit(s) were added to refs/heads/master by this push:
     new 6e12d4a  Update parse.en.md (#7977)
6e12d4a is described below

commit 6e12d4a0b6de3599d724d3ac9dc8e86fc0150196
Author: yang-7777 <67...@users.noreply.github.com>
AuthorDate: Fri Oct 30 16:06:08 2020 +0800

    Update parse.en.md (#7977)
    
    * Update parse.en.md
    
    add content
    
    * Update parse.en.md
---
 docs/document/content/features/sharding/principle/parse.en.md | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/docs/document/content/features/sharding/principle/parse.en.md b/docs/document/content/features/sharding/principle/parse.en.md
index 3370d92..40af146 100644
--- a/docs/document/content/features/sharding/principle/parse.en.md
+++ b/docs/document/content/features/sharding/principle/parse.en.md
@@ -31,8 +31,4 @@ To pursue good performance and quick achievement, the first generation of SQL pa
 
 The second generation of SQL parsing engine begins from 1.5.x version, ShardingSphere has adopted fully self-developed parsing engine ever since. Due to different purposes, ShardingSphere does not need to transform SQL into a totally abstract syntax tree or traverse twice through visitor. Using `half parsing` method, it only extracts the context required by data sharding, so the performance and compatibility of SQL parsing is further improved.
 
-The third generation of SQL parsing engine begins from 3.0.x version. ShardingSphere tries to adopts ANTLR as the SQL parsing engine, and plans to replace the former parsing engine according to the order of `DDL -> TCL -> DAL –> DCL -> DML –>DQL`. It is still in the process of replacement and iteration. Hoping for a better compatibility with SQL, we use ANTLR in the parsing engine of ShardingSphere. Though complex expressions, recursions, sub-queries and other sentences are not focused b [...]
-
-The overall structure of the third generation of SQL parser is shown in the following picture.
-
-![Parsing Engine](https://shardingsphere.apache.org/document/current/img/sharding/parsing_architecture_en.png)
+The third generation of SQL parsing engine begins from 3.0.x version. ShardingSphere tries to adopts ANTLR as the SQL parsing engine, and uses Visit to obtain SQL Statement from AST. Starting from version 5.0.x, the architecture of the parsing engine has been refactored. At the same time, it is convenient to directly obtain the parsing results of the same SQL to improve parsing efficiency by putting the AST obtained from the first parsing into the cache. Therefore, we recommend that user [...]