sushu0 commented on issue #40262:
URL: 
https://github.com/apache/shardingsphere/issues/40262#issuecomment-6271870860

   Hi @makssent, I would like to pick this up and aim to have a tested draft 
patch by October 23, 2026 (UTC).
   
   I have checked current master (`e3ab362512ee`) and traced the failure to 
Firebird `identifier -> unreservedWord`: `KEY`, `TEXT`, and `COMMENT` are 
tokenized but not accepted there. The related #40178 and #40179 do not cover 
these words. I plan to reproduce the failure in Parser IT, make the smallest 
Firebird-only grammar correction, add explicit `AS` and implicit column-alias 
regressions for all three words, and run the existing Firebird parser cases to 
protect their other uses.
   
   I will check the Firebird 5.0 reference together with the versioned engine 
grammar/lexer, especially the context-sensitive treatment of `COMMENT`; I have 
not yet run a live Proxy/server comparison and will keep that distinction 
explicit.
   
   @strongduanmu, would you be available to mentor/review this scoped parser 
fix, or point me to an appropriate parser mentor? Please let me know if someone 
is already working on it or if this scope should be adjusted.
   
   Codex is assisting with investigation, implementation, and tests. Any draft 
PR will disclose the affected files and keep the human-review requirement 
explicit.
   


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