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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2021/10/29 07:27:17 UTC
[GitHub] [shardingsphere] strongduanmu commented on issue #13326: Support openGuass dialect SQL parse and execute
strongduanmu commented on issue #13326:
URL: https://github.com/apache/shardingsphere/issues/13326#issuecomment-954495486
After some investigation, we found that `antlr4` can support simple rule inheritance. As shown in the figure below, the `MyElang` rule inherits the `Elang` rule and at the same time override the expr rule.
However, the function of rule inheritance in `antlr4` is very simple and cannot support rule inheritance under different directories and modules. Considering that `openGauss` and `PostgreSQL` parsing engines are different independent modules, we have to give up this solution.
In order to facilitate the maintenance of the openGauss dialect and avoid affecting the existing PostgreSQL parsing engine, we decided to create an independent openGauss parsing engine.
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