Detailed explanation of the addition of keywords in PostgreSQL syntax
When Postgres, the background process of PostgreSQL, receives the query statement, it first passes it to the query analysis module for lexical, syntax and semantic analysis.
Record the keywords added to the parser syntax parsing module.
Introduction to several core files
| Source File | illustrate |
|---|---|
| Define syntax structure, generate and | |
| Define the lexical structure, and generate it after flex compile | |
| Keyword list, need to be sorted in order | |
| check_keywords.pl | It will be called under linux for keyword check (order, legality, etc.) |
Adding keywords in the syntax
- %token <keyword> add keyword PARTITIONS
- Add keyword PARTITIONS to the reserved_keyword segment of the file
- File, add statement: PG_KEYWORD("partitions", PARTITIONS, UNRESERVED_KEYWORD)
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