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v2/formula-sql-pg Architecture Notes

Responsibilities

• Convert Teable formula ASTs into PostgreSQL-safe SQL expressions.
• Apply lenient, safe type coercions and emit structured error strings instead of runtime errors.
• Support multi-value fields via JSON/array normalization and optional element-wise operations.

Files

• ARCHITECTURE.md - Role: folder architecture note; Purpose: describe the package scope.
• src/index.ts - Role: package entry; Purpose: export translator API + shared types.
• src/FormulaSqlPgTranslator.ts - Role: orchestrator; Purpose: parse formula, build context, and run the visitor.
• src/FormulaSqlPgVisitor.ts - Role: AST visitor; Purpose: traverse formula nodes and delegate translation.
• src/FormulaSqlPgExpressionBuilder.ts - Role: expression builder; Purpose: type coercion, error propagation, and SQL fragment generation.
• src/FormulaSqlPgFunctions.ts - Role: function registry; Purpose: map formula functions to SQL implementations.
• src/SqlExpression.ts - Role: value model; Purpose: carry SQL + type/multiplicity + error metadata.
• src/FieldSqlCoercionVisitor.ts - Role: field visitor; Purpose: generate safe casts for field references.
• src/PgSqlHelpers.ts - Role: helper library; Purpose: shared SQL snippets for casting, arrays, and errors.
• src/testkit/FormulaSqlPgTestkit.ts - Role: test scaffold; Purpose: create tables/records via commands and evaluate formulas in Postgres.

Examples

• packages/v2/formula-sql-pg/src/FormulaSqlPgTranslator.ts - Formula translation entry.
• packages/v2/formula-sql-pg/src/FormulaSqlPgVisitor.ts - Node traversal and delegation.
• packages/v2/formula-sql-pg/src/FormulaSqlPgExpressionBuilder.ts - Core SQL building and coercions.