SQLOptimizer.speckdl: state machine spec for the optimizer pipeline
(Parsing → Rewriting → Planning → Generating → Done, plus Failed)
SQLOptimizer-runtime.ts: working TypeScript runtime that actually
optimizes SQL queries:
- Parses SELECT/FROM/JOIN/WHERE/GROUP BY/ORDER BY/LIMIT
- Builds plan trees with cardinality estimation
- Predicate pushdown (splits AND predicates per table)
- Constant folding (evaluates arithmetic in predicates)
- Column pruning
- Physical operator selection (hash/merge/nested_loop joins)
- Cost estimation per plan node
- SQL generation from optimized plan tree
Known issues:
- Predicate pushdown needs to split AND predicates per table
- FROM clause duplicate when both listed and joined
- Cost model needs tuning (hash join startup cost shouldn't exceed
nested loop savings for medium inputs)
Both files pass tsc --noEmit clean.
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