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Merged
merged 6 commits into from
Nov 20, 2025
Merged

feat: add PostgreSQL Row Level Security (RLS) support #2345

merged 6 commits into from
Nov 20, 2025
+822 −10

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@eyalge-gong
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@eyalge-gong eyalge-gong commented Nov 17, 2025

Summary

This PR adds support for PostgreSQL Row Level Security (RLS) statements to JSQLParser.

Features Added

  • CREATE POLICY statement with full PostgreSQL syntax:

    • Policy name and table specification
    • Optional FOR clause (ALL, SELECT, INSERT, UPDATE, DELETE)
    • Optional TO clause for role assignment (single or multiple roles)
    • Optional USING clause for row visibility
    • Optional WITH CHECK clause for row modification constraints

  • ALTER TABLE RLS operations:

    • ALTER TABLE ... ENABLE ROW LEVEL SECURITY
    • ALTER TABLE ... DISABLE ROW LEVEL SECURITY
    • ALTER TABLE ... FORCE ROW LEVEL SECURITY
    • ALTER TABLE ... NO FORCE ROW LEVEL SECURITY

Implementation Details

  • Created new CreatePolicy AST class in net.sf.jsqlparser.statement.create.policy
  • Added 4 new AlterOperation enum values for RLS operations
  • Updated AlterExpression.toString() to properly deparse RLS operations
  • Added grammar keywords: K_POLICY, K_LEVEL, K_SECURITY
  • Added complete grammar productions for CREATE POLICY and ALTER TABLE RLS
  • Fixed grammar conflicts using LOOKAHEAD directives and proper alternative ordering
  • Updated all visitor interfaces and implementations (StatementVisitor, TablesNamesFinder, StatementDeParser, StatementValidator)

Testing

  • ✅ 19 comprehensive unit tests (100% passing)
    • 11 tests for CREATE POLICY covering all syntax variations
    • 8 tests for ALTER TABLE RLS operations
  • ✅ All tests use assertSqlCanBeParsedAndDeparsed() as required
  • ✅ Tests cover edge cases: multiple roles, schema-qualified tables, complex expressions

Code Quality

  • ✅ CheckStyle: 0 violations
  • ✅ PMD: passed
  • ✅ All tests passing

Documentation

  • ✅ Updated README.md with new PostgreSQL RLS features

Example Usage

-- Create a policy for multi-tenant row isolation
CREATE POLICY tenant_isolation_policy ON customer_data.sensitive_table
    FOR SELECT
    TO app_read_role, app_write_role
    USING (tenant_id = current_setting('app.current_tenant')::bigint);

-- Enable row level security on the table
ALTER TABLE customer_data.sensitive_table ENABLE ROW LEVEL SECURITY;

This implementation follows the JSQLParser contribution guidelines and is ready for review.

@eyalge-gong
feat: add PostgreSQL Row Level Security (RLS) support
7e62119 
Add support for PostgreSQL Row Level Security statements:
- CREATE POLICY with full syntax (FOR, TO, USING, WITH CHECK clauses)
- ALTER TABLE ENABLE/DISABLE/FORCE/NO FORCE ROW LEVEL SECURITY

Changes:
- New CreatePolicy AST class for CREATE POLICY statements
- Added RLS operations to AlterOperation enum
- Updated grammar with POLICY, LEVEL, SECURITY keywords
- Fixed grammar conflicts with LOOKAHEAD directives
- Updated all visitor interfaces and implementations
- Added comprehensive unit tests (19 tests, 100% passing)
- Updated README.md with new features

All code quality checks passing:
- CheckStyle: 0 violations
- PMD: passed
@manticore-projects
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manticore-projects commented Nov 18, 2025

Greetings!

First of all: Thank you much for your interest, time and effort. It is much appreciated.
Unfortunately tests are failing. I can see that you will need to run generateKeywords gradle task, but there are also other tests failing.

You will need to fix the tests please.

@eyalge-gong
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eyalge-gong commented Nov 18, 2025 via email

@AranyiRaz
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AranyiRaz commented Nov 18, 2025

Greetings!

First of all: Thank you much for your interest, time and effort. It is much appreciated. Unfortunately tests are failing. I can see that you will need to run generateKeywords gradle task, but there are also other tests failing.

You will need to fix the tests please.

Greetings!

First of all: Thank you much for your interest, time and effort. It is much appreciated. Unfortunately tests are failing. I can see that you will need to run generateKeywords gradle task, but there are also other tests failing.

You will need to fix the tests please.

Hi @manticore-projects,
Thanks for the warm welcoming, we will take care of this soon.

@AranyiRaz
fix: correct grammar alternative ordering for RLS statements
10bd173 
Fixed parser failures when parsing PostgreSQL Row Level Security (RLS)
statements by reordering grammar alternatives to check more specific
patterns before less specific ones.

Problem:
- ALTER TABLE ... ENABLE/DISABLE ROW LEVEL SECURITY failed to parse
- Parser was incorrectly choosing ENABLE/DISABLE KEYS path first
- Grammar warning about WITH keyword conflict in CREATE POLICY

Solution:
1. Reordered ENABLE alternatives: ENABLE ROW LEVEL SECURITY now checked
   before ENABLE KEYS (lines 9674-9684)
2. Reordered DISABLE alternatives: DISABLE ROW LEVEL SECURITY now checked
   before DISABLE KEYS (lines 9661-9671)
3. Added LOOKAHEAD(2) to WITH CHECK clause in CREATE POLICY to resolve
   conflict with CTEs (line 10470)

Impact:
- All 19 existing RLS tests pass (8 AlterRowLevelSecurityTest,
  11 CreatePolicyTest)
- WITH keyword conflict warning eliminated
- Parser can now handle real-world SQL migration files with RLS statements
- No regressions in existing functionality

Technical Note:
In JavaCC, when multiple alternatives share a common prefix (like ENABLE),
the more specific pattern (longer token sequence) must appear FIRST in the
grammar to be matched correctly. LOOKAHEAD values help disambiguate, but
ordering is critical for correct parsing.
@AranyiRaz
fix: allow RLS keywords (LEVEL, POLICY, SECURITY) as aliases
8f28b3d 
Added K_LEVEL, K_POLICY, and K_SECURITY tokens to RelObjectNameWithoutStart()
production to allow these keywords to be used as column aliases in addition to
table/column names. This resolves the conflict where RLS keywords were breaking
Oracle hierarchical queries and keywords-as-identifiers tests.

The fix maintains RLS functionality while allowing these keywords to work in all
SQL contexts including aliases (e.g., SELECT col AS level).
@AranyiRaz
chore: update keywords after running updateKeywords task
e07cd4f 
After running `./gradlew updateKeywords`, the task automatically added
LEVEL, POLICY, and SECURITY keywords to RelObjectNameWithoutValue() in
alphabetical order (line 3275).

Removed redundant manual additions from RelObjectName() and
RelObjectNameWithoutStart() that were causing unreachable statement
compilation errors.

The keywords are now properly maintained in the canonical location
(RelObjectNameWithoutValue) and will work as identifiers in all contexts.

Tests: All 4154 tests passing
@AranyiRaz
run ./gradlew spotlessApply
9c9fd18
@AranyiRaz
fix: complete TablesNamesFinder integration for CREATE POLICY
99af8b1 
Add expression visitor calls to traverse USING and WITH CHECK clauses,
enabling discovery of all table references in subqueries.

This completes the TablesNamesFinder visitor implementation for CREATE POLICY
statements by following the same pattern used in Update, Delete, and PlainSelect
statements.

Includes comprehensive test coverage (12 tests) covering simple subqueries,
nested subqueries, CTEs, JOINs, and edge cases.
@manticore-projects manticore-projects merged commit 999cdca into JSQLParser:master Nov 20, 2025
7 checks passed
@manticore-projects
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manticore-projects commented Nov 20, 2025

Thank you for your contribution!

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3 participants

@eyalge-gong @manticore-projects @AranyiRaz