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feat(cassandra): add CQL parser with full Cassandra 4.1 grammar support#320

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rebelice merged 16 commits into
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feat/cassandra-parser
Jun 23, 2026
Merged

feat(cassandra): add CQL parser with full Cassandra 4.1 grammar support#320
rebelice merged 16 commits into
mainfrom
feat/cassandra-parser

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@rebelice rebelice commented Jun 23, 2026

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Summary

  • Hand-written recursive descent CQL parser for Apache Cassandra 4.1 (zero external dependencies)
  • Full statement coverage: SELECT, INSERT, UPDATE, DELETE, BATCH, CREATE/ALTER/DROP for TABLE, KEYSPACE, INDEX, TYPE, MV, FUNCTION, AGGREGATE, TRIGGER, ROLE, USER, plus GRANT/REVOKE/LIST and TRUNCATE/USE
  • 30 official-doc grammar compliance fixes (IF EXISTS on ALTER, CAST, bind markers, NaN/Infinity, HASHED PASSWORD, UDT field access, MBEAN resources, singular PERMISSION, multi-rename, etc.)
  • AST with full Loc position tracking on every node
  • Walker/Inspect visitor pattern with reflection-based coverage testing
  • Error messages with line, column, and "at or near" context
  • Statement splitter for multi-statement input
  • Compatibility harness with 45 .cql test files (all passing)
  • Strict LIMIT/PER PARTITION LIMIT validation (integer or bind marker only)

Test plan

  • go test ./cassandra/... -count=1 — all pass
  • go vet ./cassandra/... — clean
  • gofmt -l cassandra/ — clean
  • Compatibility harness: 45/45 .cql files pass
  • Walk coverage: all AST node types visited
  • Loc precision: all nodes have valid byte offsets
  • Error quality: line/column/near on all parse errors
  • Truncation fuzz: no panics on any prefix of valid SQL
  • Binary input: no panics on arbitrary bytes
  • @dg code review approved (7 blocking findings addressed)

🤖 Generated with Claude Code

rebelice and others added 16 commits June 22, 2026 18:50
@rebelice @claude
feat(cassandra): add CQL parser with full statement coverage (Phase 1+2)
76a1dc8 
Hand-written recursive descent parser for Apache Cassandra CQL covering:
- DML: SELECT, INSERT, UPDATE, DELETE, BATCH
- DDL: keyspace/table/index/type/MV/function/aggregate/trigger CRUD
- Auth: GRANT, REVOKE, LIST, role/user management
- Expressions: literals, collections, function calls, operators
- Splitter: semicolon-aware splitting with string/comment/code block handling
- Position tracking: byte offsets and line/column for all statements

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
fix(cassandra): address Phase 1+2 review feedback
90816c2 
- Strict parseIfNotExists(): now returns (bool, error) and requires
  the EXISTS token; rejects "IF NOT GARBAGE"
- MV SELECT * support: CREATE MATERIALIZED VIEW now accepts SELECT *
- MV WHERE IS NOT NULL: uses strict expect chain instead of blind advance
- Lexer exponent: backtrack on malformed "1e" / "1e+" instead of
  emitting invalid float tokens
- Type generic: only VECTOR<T, N> allows integer dimension parameter
- Tests: error/truncation cases for every statement family, no-panic
  coverage for malformed/truncated input, Loc walker validation,
  MV-specific tests (SELECT *, multi-column, IF NOT EXISTS + options)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
fix(cassandra): strict VECTOR<T, N> arity validation
933b073 
VECTOR type now requires exactly 1 element type + 1 integer dimension:
- vector<3> rejected (missing element type)
- vector<float, 3, 4> rejected (extra params after dimension)
- map<text, 3> rejected (integer param only valid for vector)

Added negative tests for all three cases plus positive test for
valid vector<float, 3> in CREATE TABLE.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
feat(cassandra): Phase 3 — L2 Loc position precision
3c27fd3 
Add AST walker infrastructure and comprehensive Loc validation:

- ast/walk.go: Visitor interface, Walk(), Inspect() functions
- ast/walk_children.go: hand-written walkChildren covering all ~50 node
  types with correct child traversal
- loc_test.go: reflection-based CheckLocations + walkNodeLocs that
  recursively validates every Loc field in the AST tree (detects
  End <= Start and mixed sentinel violations)
- TestCheckLocations: 37 test cases covering all statement families
  (DML, DDL, Auth, multi-statement) — zero Loc violations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
fix(cassandra): Phase 3 review fixes — parser bugs, walker tests, enh…
49bd97d 
…anced Loc checks

- Fix ALTER/DROP MV double-advance of VIEW token (dispatch already consumed it)
- Fix CREATE TRIGGER grammar: name ON table USING class (was missing ON table)
- Fix UUID lexing for digit-prefixed UUIDs like 550e8400-e29b-... (was parsed as float)
- Fix NULL/TRUE/FALSE in expression context (were swallowed by isIdentLike)
- Add ast/walk_test.go: direct unit tests for Walk/Inspect
- Add walk_coverage_test.go: reflection-vs-Walk coverage for all AST node types
- Enhance CheckLocations: bounds + parent containment + statement containment
- Add DotAccess and VectorLit test SQL for full walker coverage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
style(cassandra): gofmt + remove unused fmt init in walk_coverage_test
1d391e4 
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
feat(cassandra): Phase 4 — L3 Error quality
b9eba2c 
- Enhance ParseError with Line, Column, Near fields
- Error format: "line N column M: message at or near 'token'"
- Store line index in Lexer for offset-to-position conversion
- Lexer errors (unterminated string/identifier/code block) include line/column
- Parser errorf() prefers lexer errors when available (e.g. unterminated string)
- Add TestErrorLineColumn: verifies line/column accuracy for single-line,
  multi-line, deep-in-statement, and unterminated string errors
- Add TestErrorAtOrNear: verifies "at or near" context in error messages
- Add TestTruncationFuzz: truncates 12 valid SQL statements at every byte
  position (1500+ truncation points), verifies no panics
- Add TestBinaryInputNoPanic: null bytes, 0xFF sequences, embedded nulls

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
fix(cassandra): add Near context to lexer errors for consistency
7b3e064 
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
feat(cassandra): Phase 5 — Compatibility validation harness
f7de725 
- Add TestCompatibilityHarness: parses all 45 CQL example files from
  the ANTLR reference grammar test corpus (105 statements total)
- 44/45 files pass; 1 expected failure (standalone APPLY BATCH)
- Fix UUID lexing for digit-prefixed UUIDs with hex-letter continuation
  (e.g. 6ab09bec-e68e-...) — extend digit scan to check for 8-char
  hex group forming UUID pattern
- Validate Loc correctness on all parsed statements via CheckLocations

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
fix(cassandra): vendor CQL corpus and fix compatibility harness
6ea69e9 
Address Phase 5 review findings:
- Vendor 45 CQL example files into cassandra/testdata/cql/examples/
- Use runtime.Caller to resolve testdata path (hermetic, no absolute paths)
- Missing corpus now fails with t.Fatalf instead of silently skipping
- Fix summary counters: totalFiles, passedFiles, expectedFailureFiles, totalStmts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
cleanup: remove dead absolute path in walk_coverage_test.go
53bbd49 
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
feat(cassandra): P0 CQL grammar compliance fixes
6ef467e 
Align parser with official Apache Cassandra 4.1 CQL documentation:
- Support // line comments alongside --
- Add != operator
- GROUP BY clause in SELECT
- PER PARTITION LIMIT clause in SELECT
- KEYS/VALUES/ENTRIES/FULL index column specs
- COUNTER batch type
- Optional FINALFUNC/INITCOND in CREATE AGGREGATE
- GRANT/REVOKE ROLE statements

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
feat(cassandra): P1 IF EXISTS/IF NOT EXISTS on ALTER statements
d82d708 
Add optional IF EXISTS to ALTER KEYSPACE, ALTER TABLE, ALTER TYPE,
ALTER MATERIALIZED VIEW, ALTER ROLE, ALTER USER. Add sub-operation
guards: ADD IF NOT EXISTS, DROP IF EXISTS, RENAME IF EXISTS on
ALTER TABLE and ALTER TYPE per Cassandra 4.1 CQL specification.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
feat(cassandra): P2 remaining CQL grammar compliance fixes
2a47bcb 
Complete all grammar compliance items for Cassandra 4.1 CQL:
- CAST(expr AS type) expressions
- Bind markers (? positional and :name named)
- NaN/Infinity float literals
- DROP FUNCTION/AGGREGATE with optional argument type signatures
- IF condition extensions: IN, CONTAINS, CONTAINS KEY in LWT
- INSERT JSON DEFAULT NULL alongside DEFAULT UNSET
- HASHED PASSWORD and ACCESS TO DATACENTERS in role options
- UDT field access (col.field) in UPDATE SET and DELETE targets
- MBEAN/MBEANS and ALL MBEANS resource types
- FUNCTION resource with type signature in GRANT/REVOKE

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
fix(cassandra): address @dg review findings — 7 blocking issues
e96fd39 
1. CREATE/ALTER USER: WITH PASSWORD optional, HASHED PASSWORD support
2. LIMIT/PER PARTITION LIMIT: accept bind markers (? and :name)
3. ALTER TABLE RENAME: support multiple pairs (a TO b AND c TO d)
4. Singular PERMISSION keyword (GRANT SELECT PERMISSION ON ...)
5. CREATE CUSTOM INDEX: support both WITH OPTIONS = {...} and WITH {...}
6. MBEAN/MBEANS: checked type assertion to prevent panic on non-string
7. gofmt formatting on node.go, update.go, split_test.go

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice @claude
fix(cassandra): restrict LIMIT to integer/bind marker only
b62cecf 
parseLimitValue() no longer falls through to parseConstant(). Only
tokINTEGER, positional (?), and named (:name) bind markers are accepted.
Strings, bools, nulls, and floats are now rejected with a clear error.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@rebelice rebelice merged commit 28c5d24 into main Jun 23, 2026
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