Module pipeline 

SQL pre-processing orchestrator: rewrite NodeDB-specific syntax into standard SQL before handing to sqlparser-rs.

Handles:

• UPSERT INTO coll (cols) VALUES (vals) → INSERT INTO ... + upsert flag
• INSERT INTO coll { key: 'val', ... } → INSERT INTO coll (key) VALUES ('val')
• UPSERT INTO coll { ... } → both rewrites combined
• expr <-> expr → vector_distance(expr, expr)
• { key: val } in function args → JSON string literal

Structs

PreprocessedSql

Result of pre-processing a SQL string.

Functions

preprocess

Pre-process a SQL string, rewriting NodeDB-specific syntax.