What is gram.y and why is it important?

gram.y is the primary Bison/Yacc grammar file in the PostgreSQL source code. It defines the definitive syntax for all SQL statements that PostgreSQL can parse.

Is this useful for Go developers using pg_query_go?

Absolutely. Since pg_query_go wraps the actual Postgres parser, understanding the grammar rules in gram.y allows you to navigate the resulting JSON parse tree effectively.

Does it help with parsing third-party SQL?

While focused on core PostgreSQL, it provides the methodology to trace how any SQL construct is transformed into a parse tree, which is essential for building parsers.

How does this skill assist with DDL generation?

It provides the exact ordering and optional components of statements like CREATE TABLE or ALTER INDEX, ensuring that your generated SQL is always valid.

Can this skill identify reserved keywords?

Yes, it guides you to reference keywords.c to determine if an identifier is a reserved keyword that must be quoted in your DDL.

PostgreSQL Syntax & Grammar Reference

Name: PostgreSQL Syntax & Grammar Reference
Author: Activer007

byActiver007

데이터베이스 관리

Consults PostgreSQL's internal parser and grammar rules to provide precise guidance on SQL syntax and DDL structure.

소개

This skill provides an expert-level bridge between the PostgreSQL source code and practical SQL tool development. By referencing the internal Bison/Yacc grammar (gram.y) and lexical scanner (scan.l), it helps developers understand the exact structure of DDL statements, operator precedence, and keyword classification. It is particularly useful for those building schema management tools, SQL parsers, or migration engines that require 100% compatibility with PostgreSQL's native parsing logic.

주요 기능

Mapping of SQL statements to internal PostgreSQL production rules
Detailed analysis of complex constructs like triggers and expression indexes
Reserved and unreserved keyword identification for identifier quoting
Workflow guidance for implementing SQL parsers and schema diffing logic
Interpretation of Yacc/Bison grammar syntax for DDL statements
0 GitHub stars

사용 사례

Generating valid DDL for complex PostgreSQL features like identity columns or constraint triggers
Implementing custom SQL parsing in Go using pg_query_go and libpg_query
Debugging syntax errors in automated schema migration and comparison tools

소개

주요 기능

Mapping of SQL statements to internal PostgreSQL production rules
Detailed analysis of complex constructs like triggers and expression indexes
Reserved and unreserved keyword identification for identifier quoting
Workflow guidance for implementing SQL parsers and schema diffing logic
Interpretation of Yacc/Bison grammar syntax for DDL statements
0 GitHub stars

사용 사례

Generating valid DDL for complex PostgreSQL features like identity columns or constraint triggers
Implementing custom SQL parsing in Go using pg_query_go and libpg_query
Debugging syntax errors in automated schema migration and comparison tools