fix: Potential fixes for 4 code quality findings#12
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…ofix Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com> Signed-off-by: Scott Schreckengaust <scottschreckengaust@users.noreply.github.com>
…ofix Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com> Signed-off-by: Scott Schreckengaust <scottschreckengaust@users.noreply.github.com>
Signed-off-by: Scott Schreckengaust <scottschreckengaust@users.noreply.github.com>
…s.cjs Signed-off-by: Scott Schreckengaust <scottschreckengaust@users.noreply.github.com>
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Correctness: - #3: Restore 3k-row cap in Quick Start step 3 - #6: Add PostgreSQL parser caveat to Workflow 7 (MySQL syntax → parse error → fallback) - #10: Fix ORM pattern to present fixed_with_warning to user (not auto-accept) - #12: Unfixable rewrites MUST present to user before substituting Docs accuracy: - #7: Rails: use db:structure:dump with schema_format = :sql - #8: Prisma: add required --from-empty --to-schema-datamodel flags Error handling: - #16: Add Error Handling section for dsql_lint failures (MCP unavailable, parse error, timeout) Evals: - #5: Add evals 102/103 to results summary table - #9: Fix model metadata (remove specific version) - #11: Add missing category_id column to eval 103 prompt Already fixed in previous commit: - #17: dsql-lint removed from description (93e9c7b) PR body items (1, 2, 4) will be updated separately.
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Correctness: - #3: Restore 3k-row cap in Quick Start step 3 - #6: Add PostgreSQL parser caveat to Workflow 7 (MySQL syntax → parse error → fallback) - #10: Fix ORM pattern to present fixed_with_warning to user (not auto-accept) - #12: Unfixable rewrites MUST present to user before substituting Docs accuracy: - #7: Rails: use db:schema:dump with schema_format = :sql (6.1+) - #8: Prisma: add required --from-empty --to-schema-datamodel flags - SQLAlchemy: use CreateTable(table).compile(engine) instead of metadata.create_all(echo=True) which executes DDL Error handling: - #16: Add Error Handling section for dsql_lint failures (MCP unavailable, parse error, timeout) with user-confirmation gates - Add dsql_lint-unavailable entry to SKILL.md Error Scenarios Evals: - #5: Add evals 102/103 to results MD with detail sections - #9: Fix model metadata (remove specific version; clarify manual grading) - #11: Add missing category_id column to eval 103 prompt - Tighten eval expectations to reference concrete tool outputs (rule names, summary fields) - Replace emoji markers with PASS/FAIL/PARTIAL to fix dprint table alignment - Bump recorded dsql-lint version to 0.1.4 Self-review fixes (17 sub-agent review rounds): - Document accurate fix_result.status enum: fixed | fixed_with_warning | unfixable (tool emits status='unfixable' explicitly; earlier doc incorrectly implied absence) - Scope Unfixable Errors table to truly-unfixable rules only (set_transaction, truncate, create_table_as, add_column_constraint, index_expression, index_partial, unsupported_alter_table_op); note that temp_table, inherits, index_using, transaction_isolation are fixed/fixed_with_warning - Fix transaction_isolation vs set_transaction rule-id confusion - Promote reference-load gate from SHOULD to MUST with tightened trigger - Workflow 2: explicit lint gate for async index DDL (step 5) - Workflow 6: lint every generated DDL in Table Recreation Pattern - Workflow 7: cross-check MySQL source against type-mapping.md even on clean lint (ENGINE=, SET() pass silently through PostgreSQL parser) - Document 1M-char SQL limit and 30s server timeout - Require user confirmation before destructive DDL (DROP/RENAME/TRUNCATE), MCP-unavailable fallback, parse_error manual rewrite, and timeout split-retry paths - Forbid executing fixed_sql while any unfixable diagnostic remains (re-lint until clean) - Add user override semantics for "just run it" requests - Remove redundant Usage Patterns, Exit Codes, and Additional Resources sections Already fixed in previous commit: - #17: dsql-lint removed from description (93e9c7b) PR body items (1, 2, 4) will be updated separately.
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Correctness: - #3: Restore 3k-row cap in Quick Start step 3 - #6: Add PostgreSQL parser caveat to Workflow 7 (MySQL syntax → parse error → fallback) - #10: Fix ORM pattern to present fixed_with_warning to user (not auto-accept) - #12: Unfixable rewrites MUST present to user before substituting Docs accuracy: - #7: Rails: use db:schema:dump with schema_format = :sql (6.1+) - #8: Prisma: add required --from-empty --to-schema-datamodel flags - SQLAlchemy: use CreateTable(table).compile(engine) instead of metadata.create_all(echo=True) which executes DDL Error handling: - #16: Add Error Handling section for dsql_lint failures (MCP unavailable, parse error, timeout) with user-confirmation gates - Add dsql_lint-unavailable entry to SKILL.md Error Scenarios Evals: - #5: Add evals 102/103 to results MD with detail sections - #9: Fix model metadata (remove specific version; clarify manual grading) - #11: Add missing category_id column to eval 103 prompt - Tighten eval expectations to reference concrete tool outputs (rule names, summary fields) - Replace emoji markers with PASS/FAIL/PARTIAL to fix dprint table alignment - Bump recorded dsql-lint version to 0.1.4 Self-review fixes (17 sub-agent review rounds): - Document accurate fix_result.status enum: fixed | fixed_with_warning | unfixable (tool emits status='unfixable' explicitly; earlier doc incorrectly implied absence) - Scope Unfixable Errors table to truly-unfixable rules only (set_transaction, truncate, create_table_as, add_column_constraint, index_expression, index_partial, unsupported_alter_table_op); note that temp_table, inherits, index_using, transaction_isolation are fixed/fixed_with_warning - Fix transaction_isolation vs set_transaction rule-id confusion - Promote reference-load gate from SHOULD to MUST with tightened trigger - Workflow 2: explicit lint gate for async index DDL (step 5) - Workflow 6: lint every generated DDL in Table Recreation Pattern - Workflow 7: cross-check MySQL source against type-mapping.md even on clean lint (ENGINE=, SET() pass silently through PostgreSQL parser) - Document 1M-char SQL limit and 30s server timeout - Require user confirmation before destructive DDL (DROP/RENAME/TRUNCATE), MCP-unavailable fallback, parse_error manual rewrite, and timeout split-retry paths - Forbid executing fixed_sql while any unfixable diagnostic remains (re-lint until clean) - Add user override semantics for "just run it" requests - Remove redundant Usage Patterns, Exit Codes, and Additional Resources sections Already fixed in previous commit: - #17: dsql-lint removed from description (93e9c7b) PR body items (1, 2, 4) will be updated separately.
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Correctness: - #3: Restore 3k-row cap in Quick Start step 3 - #6: Add PostgreSQL parser caveat to Workflow 7 (MySQL syntax → parse error → fallback) - #10: Fix ORM pattern to present fixed_with_warning to user (not auto-accept) - #12: Unfixable rewrites MUST present to user before substituting Docs accuracy: - #7: Rails: use db:schema:dump with schema_format = :sql (6.1+) - #8: Prisma: add required --from-empty --to-schema-datamodel flags - SQLAlchemy: use CreateTable(table).compile(engine) instead of metadata.create_all(echo=True) which executes DDL Error handling: - #16: Add Error Handling section for dsql_lint failures (MCP unavailable, parse error, timeout) with user-confirmation gates - Add dsql_lint-unavailable entry to SKILL.md Error Scenarios Evals: - #5: Add evals 102/103 to results MD with detail sections - #9: Fix model metadata (remove specific version; clarify manual grading) - #11: Add missing category_id column to eval 103 prompt - Tighten eval expectations to reference concrete tool outputs (rule names, summary fields) - Replace emoji markers with PASS/FAIL/PARTIAL to fix dprint table alignment - Bump recorded dsql-lint version to 0.1.4 Self-review fixes (17 sub-agent review rounds): - Document accurate fix_result.status enum: fixed | fixed_with_warning | unfixable (tool emits status='unfixable' explicitly; earlier doc incorrectly implied absence) - Scope Unfixable Errors table to truly-unfixable rules only (set_transaction, truncate, create_table_as, add_column_constraint, index_expression, index_partial, unsupported_alter_table_op); note that temp_table, inherits, index_using, transaction_isolation are fixed/fixed_with_warning - Fix transaction_isolation vs set_transaction rule-id confusion - Promote reference-load gate from SHOULD to MUST with tightened trigger - Workflow 2: explicit lint gate for async index DDL (step 5) - Workflow 6: lint every generated DDL in Table Recreation Pattern - Workflow 7: cross-check MySQL source against type-mapping.md even on clean lint (ENGINE=, SET() pass silently through PostgreSQL parser) - Document 1M-char SQL limit and 30s server timeout - Require user confirmation before destructive DDL (DROP/RENAME/TRUNCATE), MCP-unavailable fallback, parse_error manual rewrite, and timeout split-retry paths - Forbid executing fixed_sql while any unfixable diagnostic remains (re-lint until clean) - Add user override semantics for "just run it" requests - Remove redundant Usage Patterns, Exit Codes, and Additional Resources sections Already fixed in previous commit: - #17: dsql-lint removed from description (93e9c7b) PR body items (1, 2, 4) will be updated separately.
Morlej
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May 8, 2026
…dation (awslabs#157) * feat(dsql): add dsql_lint tool integration for SQL compatibility validation Add dsql-lint as a deterministic validation tool the agent invokes before executing externally-sourced SQL. Enables migration support for customers coming from PostgreSQL, MySQL, or ORMs (Django, Rails, Prisma, TypeORM). Changes: - Add references/dsql-lint.md: tool API, fix statuses, usage patterns, ORM integration, unfixable error resolution - Update SKILL.md: add dsql_lint to MCP Tools section, update Workflows 2/6/7 with lint validation steps, add Workflow 9 (Validate & Migrate SQL to DSQL) - Update frontmatter: add lint/ORM trigger phrases and tags The dsql_lint MCP tool (shipping separately in awslabs/mcp) validates SQL and optionally auto-fixes issues, returning structured diagnostics the agent acts on. The skill teaches the agent when and how to use it. * fix: resolve markdownlint errors (MD029, MD032) - MD029: Restart ordered list numbering after section breaks - MD032: Add blank lines before lists after bold headings * refactor: trim SKILL.md to 276 lines (under 300 limit) Move AWS Knowledge limits table reference to development-guide.md (already documented there). Condense Quick Start to 3 lines. Trim workflow descriptions to routing-only — detail lives in reference files. validate-size.py: 276 lines, status 'good' validate-references.py: 0 broken links, 0 new orphans * fix: address review feedback - Restore destructive workflow warning in Workflow 6 - Re-introduce RFC language (MUST, MAY) in Quick Start - Use active voice: 'Use get_schema', 'Use transact', 'Use readonly_query' - Restore 'one DDL per transaction, multiple DML may share' framing - Remove 'lint' from tags (not sufficient alone to trigger skill) - Remove TOC from dsql-lint.md (file is short, TOC adds no value) * style: apply dprint table formatting to dsql-lint.md Run dprint fmt to align table columns per repo formatting rules. * feat: add dsql_lint eval harness and tool availability fallback - Add tools/evals/databases-on-aws/dsql/dsql_lint_evals.json with 4 functional evals covering: pg_dump migration, Django ORM migration, clean SQL validation, and MySQL with unfixable issues - Add availability note to dsql-lint.md: fall back to manual validation using existing DDL rules when the MCP tool is not yet available The evals test that the agent calls dsql_lint before executing SQL, presents warnings to the user, and handles unfixable errors correctly. * fix: remove incorrect availability fallback note The dsql_lint tool and the skill that references it will ship together in the same MCP repo PR. There is no availability gap — the fallback note was based on a wrong assumption about PR splitting. * feat: add eval harness results from local dsql_lint testing Run dsql_lint_evals.json against local MCP server with dsql_lint tool. All 4 evals pass — tool correctly identifies compatibility issues, produces fixed SQL, and reports unfixable errors for manual resolution. Key findings: - Eval 103 (MySQL syntax): dsql-lint uses a PostgreSQL parser, so MySQL-specific syntax (SET, ENGINE, PARTITION BY) triggers a parse error rather than individual rules. Agent falls back to mysql-migrations reference for these cases. * feat: replace tool-only eval results with behavioral with-skill vs baseline comparison Run evals as subagent behavioral tests: one agent with the skill loaded (uses dsql_lint), one baseline without (relies on model knowledge). Key findings: - Baseline hallucinates JSON→JSONB (DSQL rejects JSONB as column type) - Baseline misses CREATE INDEX ASYNC requirement - Baseline doesn't split multi-DDL transactions - Skill-guided agent uses dsql_lint for deterministic validation, produces correct output on all three failure points The iron law holds: the agent fails without this skill change. * fix: address review feedback round 2 - Restore hardcoded limits table (critical for performance, not all are in dev guide, link to DSQL docs prevents stale numbers) - Merge Workflow 9 into Workflow 7 as 'Validate and Migrate to DSQL' (reduces line count, single entry point for all migration sources) - Trim redundant triggers from description (lint SQL covers dsql-lint, migrate to DSQL covers ORM migration DSQL) 290 lines, mise run build passes. * fix: remove dsql-lint from description, trim trigger Per review: 'SQL compatibility validation' is sufficient without naming the tool. Remove 'via dsql-lint' and 'lint SQL for DSQL' trigger — 'migrate to DSQL' already covers the use case. * fix: address code review findings (18-item tracker) Correctness: - awslabs#3: Restore 3k-row cap in Quick Start step 3 - awslabs#6: Add PostgreSQL parser caveat to Workflow 7 (MySQL syntax → parse error → fallback) - awslabs#10: Fix ORM pattern to present fixed_with_warning to user (not auto-accept) - awslabs#12: Unfixable rewrites MUST present to user before substituting Docs accuracy: - awslabs#7: Rails: use db:schema:dump with schema_format = :sql (6.1+) - awslabs#8: Prisma: add required --from-empty --to-schema-datamodel flags - SQLAlchemy: use CreateTable(table).compile(engine) instead of metadata.create_all(echo=True) which executes DDL Error handling: - awslabs#16: Add Error Handling section for dsql_lint failures (MCP unavailable, parse error, timeout) with user-confirmation gates - Add dsql_lint-unavailable entry to SKILL.md Error Scenarios Evals: - awslabs#5: Add evals 102/103 to results MD with detail sections - awslabs#9: Fix model metadata (remove specific version; clarify manual grading) - awslabs#11: Add missing category_id column to eval 103 prompt - Tighten eval expectations to reference concrete tool outputs (rule names, summary fields) - Replace emoji markers with PASS/FAIL/PARTIAL to fix dprint table alignment - Bump recorded dsql-lint version to 0.1.4 Self-review fixes (17 sub-agent review rounds): - Document accurate fix_result.status enum: fixed | fixed_with_warning | unfixable (tool emits status='unfixable' explicitly; earlier doc incorrectly implied absence) - Scope Unfixable Errors table to truly-unfixable rules only (set_transaction, truncate, create_table_as, add_column_constraint, index_expression, index_partial, unsupported_alter_table_op); note that temp_table, inherits, index_using, transaction_isolation are fixed/fixed_with_warning - Fix transaction_isolation vs set_transaction rule-id confusion - Promote reference-load gate from SHOULD to MUST with tightened trigger - Workflow 2: explicit lint gate for async index DDL (step 5) - Workflow 6: lint every generated DDL in Table Recreation Pattern - Workflow 7: cross-check MySQL source against type-mapping.md even on clean lint (ENGINE=, SET() pass silently through PostgreSQL parser) - Document 1M-char SQL limit and 30s server timeout - Require user confirmation before destructive DDL (DROP/RENAME/TRUNCATE), MCP-unavailable fallback, parse_error manual rewrite, and timeout split-retry paths - Forbid executing fixed_sql while any unfixable diagnostic remains (re-lint until clean) - Add user override semantics for "just run it" requests - Remove redundant Usage Patterns, Exit Codes, and Additional Resources sections Already fixed in previous commit: - awslabs#17: dsql-lint removed from description (93e9c7b) PR body items (1, 2, 4) will be updated separately.
Morlej
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…vals Correctness fixes (review items 1-5): - awslabs#1: push-computation-to-constant — use NUMERIC column 'amount' to avoid integer division non-equivalence - awslabs#2: not-in-to-not-exists — add NULL semantics warning (NOT EXISTS does not preserve NOT IN's NULL-propagation; MUST confirm with user) - awslabs#3/awslabs#4: subquery-unnesting — prefer EXISTS form (true semi-join); document uniqueness precondition for JOIN+DISTINCT alternative - awslabs#5: subquery-unnesting-scalar — add COALESCE(s_count, 0) for COUNT/SUM (LEFT JOIN returns NULL, scalar returns 0) Dangling reference fixes (review items 6-8): - awslabs#6: workflow.md trigger table — "Phase 5" → reassessment re-entry - awslabs#7: Replace all "implicit cast compatibility matrix" references with "pg_amop query in catalog-queries.md" - awslabs#8: plan-interpretation.md L202 — fix cast-vs-operator contradiction Structural fixes (review items 9-14, 24): - awslabs#9: Hedge "integer family" claim with "at time of writing" + verify - awslabs#10: amopmethod=10003 — add provenance comment and verification SQL - awslabs#11: catalog-queries.md TOC — add 3 missing sections - awslabs#12: plan-interpretation.md TOC — add Type Coercion section - awslabs#13: SKILL.md — explicitly delegate routing to workflow.md - awslabs#24: workflow.md — remove em dashes from headings for clean anchors Other fixes (review items 21-23): - awslabs#21: reltuples-estimate — add staleness warning (MUST warn user) - awslabs#22: catalog-queries — add safe_query.build() note for placeholders - awslabs#23: "Skip when" → "SHOULD skip when" in all rewrite files Eval improvements (review items 14, 16): - awslabs#14: README — add query_plan_rewrite_evals to directory tree and eval section - awslabs#16: Add evals 206-210 covering LEFT JOIN, computation push, NOT IN with NULL warning, nested UNION ALL, and negative case (OR across different columns) - awslabs#7 (eval): Update eval 201 expectation — pg_amop instead of matrix Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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May 26, 2026
…vals Correctness fixes (review items 1-5): - awslabs#1: push-computation-to-constant — use NUMERIC column 'amount' to avoid integer division non-equivalence - awslabs#2: not-in-to-not-exists — add NULL semantics warning (NOT EXISTS does not preserve NOT IN's NULL-propagation; MUST confirm with user) - awslabs#3/awslabs#4: subquery-unnesting — prefer EXISTS form (true semi-join); document uniqueness precondition for JOIN+DISTINCT alternative - awslabs#5: subquery-unnesting-scalar — add COALESCE(s_count, 0) for COUNT/SUM (LEFT JOIN returns NULL, scalar returns 0) Dangling reference fixes (review items 6-8): - awslabs#6: workflow.md trigger table — "Phase 5" → reassessment re-entry - awslabs#7: Replace all "implicit cast compatibility matrix" references with "pg_amop query in catalog-queries.md" - awslabs#8: plan-interpretation.md L202 — fix cast-vs-operator contradiction Structural fixes (review items 9-14, 24): - awslabs#9: Hedge "integer family" claim with "at time of writing" + verify - awslabs#10: amopmethod=10003 — add provenance comment and verification SQL - awslabs#11: catalog-queries.md TOC — add 3 missing sections - awslabs#12: plan-interpretation.md TOC — add Type Coercion section - awslabs#13: SKILL.md — explicitly delegate routing to workflow.md - awslabs#24: workflow.md — remove em dashes from headings for clean anchors Other fixes (review items 21-23): - awslabs#21: reltuples-estimate — add staleness warning (MUST warn user) - awslabs#22: catalog-queries — add safe_query.build() note for placeholders - awslabs#23: "Skip when" → "SHOULD skip when" in all rewrite files Eval improvements (review items 14, 16): - awslabs#14: README — add query_plan_rewrite_evals to directory tree and eval section - awslabs#16: Add evals 206-210 covering LEFT JOIN, computation push, NOT IN with NULL warning, nested UNION ALL, and negative case (OR across different columns) - awslabs#7 (eval): Update eval 201 expectation — pg_amop instead of matrix Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Morlej
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Jun 17, 2026
…vals Correctness fixes (review items 1-5): - awslabs#1: push-computation-to-constant — use NUMERIC column 'amount' to avoid integer division non-equivalence - awslabs#2: not-in-to-not-exists — add NULL semantics warning (NOT EXISTS does not preserve NOT IN's NULL-propagation; MUST confirm with user) - awslabs#3/awslabs#4: subquery-unnesting — prefer EXISTS form (true semi-join); document uniqueness precondition for JOIN+DISTINCT alternative - awslabs#5: subquery-unnesting-scalar — add COALESCE(s_count, 0) for COUNT/SUM (LEFT JOIN returns NULL, scalar returns 0) Dangling reference fixes (review items 6-8): - awslabs#6: workflow.md trigger table — "Phase 5" → reassessment re-entry - awslabs#7: Replace all "implicit cast compatibility matrix" references with "pg_amop query in catalog-queries.md" - awslabs#8: plan-interpretation.md L202 — fix cast-vs-operator contradiction Structural fixes (review items 9-14, 24): - awslabs#9: Hedge "integer family" claim with "at time of writing" + verify - awslabs#10: amopmethod=10003 — add provenance comment and verification SQL - awslabs#11: catalog-queries.md TOC — add 3 missing sections - awslabs#12: plan-interpretation.md TOC — add Type Coercion section - awslabs#13: SKILL.md — explicitly delegate routing to workflow.md - awslabs#24: workflow.md — remove em dashes from headings for clean anchors Other fixes (review items 21-23): - awslabs#21: reltuples-estimate — add staleness warning (MUST warn user) - awslabs#22: catalog-queries — add safe_query.build() note for placeholders - awslabs#23: "Skip when" → "SHOULD skip when" in all rewrite files Eval improvements (review items 14, 16): - awslabs#14: README — add query_plan_rewrite_evals to directory tree and eval section - awslabs#16: Add evals 206-210 covering LEFT JOIN, computation push, NOT IN with NULL warning, nested UNION ALL, and negative case (OR across different columns) - awslabs#7 (eval): Update eval 201 expectation — pg_amop instead of matrix Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Morlej
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…vals Correctness fixes (review items 1-5): - awslabs#1: push-computation-to-constant — use NUMERIC column 'amount' to avoid integer division non-equivalence - awslabs#2: not-in-to-not-exists — add NULL semantics warning (NOT EXISTS does not preserve NOT IN's NULL-propagation; MUST confirm with user) - awslabs#3/awslabs#4: subquery-unnesting — prefer EXISTS form (true semi-join); document uniqueness precondition for JOIN+DISTINCT alternative - awslabs#5: subquery-unnesting-scalar — add COALESCE(s_count, 0) for COUNT/SUM (LEFT JOIN returns NULL, scalar returns 0) Dangling reference fixes (review items 6-8): - awslabs#6: workflow.md trigger table — "Phase 5" → reassessment re-entry - awslabs#7: Replace all "implicit cast compatibility matrix" references with "pg_amop query in catalog-queries.md" - awslabs#8: plan-interpretation.md L202 — fix cast-vs-operator contradiction Structural fixes (review items 9-14, 24): - awslabs#9: Hedge "integer family" claim with "at time of writing" + verify - awslabs#10: amopmethod=10003 — add provenance comment and verification SQL - awslabs#11: catalog-queries.md TOC — add 3 missing sections - awslabs#12: plan-interpretation.md TOC — add Type Coercion section - awslabs#13: SKILL.md — explicitly delegate routing to workflow.md - awslabs#24: workflow.md — remove em dashes from headings for clean anchors Other fixes (review items 21-23): - awslabs#21: reltuples-estimate — add staleness warning (MUST warn user) - awslabs#22: catalog-queries — add safe_query.build() note for placeholders - awslabs#23: "Skip when" → "SHOULD skip when" in all rewrite files Eval improvements (review items 14, 16): - awslabs#14: README — add query_plan_rewrite_evals to directory tree and eval section - awslabs#16: Add evals 206-210 covering LEFT JOIN, computation push, NOT IN with NULL warning, nested UNION ALL, and negative case (OR across different columns) - awslabs#7 (eval): Update eval 201 expectation — pg_amop instead of matrix Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Jun 22, 2026
…vals Correctness fixes (review items 1-5): - awslabs#1: push-computation-to-constant — use NUMERIC column 'amount' to avoid integer division non-equivalence - awslabs#2: not-in-to-not-exists — add NULL semantics warning (NOT EXISTS does not preserve NOT IN's NULL-propagation; MUST confirm with user) - awslabs#3/awslabs#4: subquery-unnesting — prefer EXISTS form (true semi-join); document uniqueness precondition for JOIN+DISTINCT alternative - awslabs#5: subquery-unnesting-scalar — add COALESCE(s_count, 0) for COUNT/SUM (LEFT JOIN returns NULL, scalar returns 0) Dangling reference fixes (review items 6-8): - awslabs#6: workflow.md trigger table — "Phase 5" → reassessment re-entry - awslabs#7: Replace all "implicit cast compatibility matrix" references with "pg_amop query in catalog-queries.md" - awslabs#8: plan-interpretation.md L202 — fix cast-vs-operator contradiction Structural fixes (review items 9-14, 24): - awslabs#9: Hedge "integer family" claim with "at time of writing" + verify - awslabs#10: amopmethod=10003 — add provenance comment and verification SQL - awslabs#11: catalog-queries.md TOC — add 3 missing sections - awslabs#12: plan-interpretation.md TOC — add Type Coercion section - awslabs#13: SKILL.md — explicitly delegate routing to workflow.md - awslabs#24: workflow.md — remove em dashes from headings for clean anchors Other fixes (review items 21-23): - awslabs#21: reltuples-estimate — add staleness warning (MUST warn user) - awslabs#22: catalog-queries — add safe_query.build() note for placeholders - awslabs#23: "Skip when" → "SHOULD skip when" in all rewrite files Eval improvements (review items 14, 16): - awslabs#14: README — add query_plan_rewrite_evals to directory tree and eval section - awslabs#16: Add evals 206-210 covering LEFT JOIN, computation push, NOT IN with NULL warning, nested UNION ALL, and negative case (OR across different columns) - awslabs#7 (eval): Update eval 201 expectation — pg_amop instead of matrix Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Jun 24, 2026
…vals Correctness fixes (review items 1-5): - awslabs#1: push-computation-to-constant — use NUMERIC column 'amount' to avoid integer division non-equivalence - awslabs#2: not-in-to-not-exists — add NULL semantics warning (NOT EXISTS does not preserve NOT IN's NULL-propagation; MUST confirm with user) - awslabs#3/awslabs#4: subquery-unnesting — prefer EXISTS form (true semi-join); document uniqueness precondition for JOIN+DISTINCT alternative - awslabs#5: subquery-unnesting-scalar — add COALESCE(s_count, 0) for COUNT/SUM (LEFT JOIN returns NULL, scalar returns 0) Dangling reference fixes (review items 6-8): - awslabs#6: workflow.md trigger table — "Phase 5" → reassessment re-entry - awslabs#7: Replace all "implicit cast compatibility matrix" references with "pg_amop query in catalog-queries.md" - awslabs#8: plan-interpretation.md L202 — fix cast-vs-operator contradiction Structural fixes (review items 9-14, 24): - awslabs#9: Hedge "integer family" claim with "at time of writing" + verify - awslabs#10: amopmethod=10003 — add provenance comment and verification SQL - awslabs#11: catalog-queries.md TOC — add 3 missing sections - awslabs#12: plan-interpretation.md TOC — add Type Coercion section - awslabs#13: SKILL.md — explicitly delegate routing to workflow.md - awslabs#24: workflow.md — remove em dashes from headings for clean anchors Other fixes (review items 21-23): - awslabs#21: reltuples-estimate — add staleness warning (MUST warn user) - awslabs#22: catalog-queries — add safe_query.build() note for placeholders - awslabs#23: "Skip when" → "SHOULD skip when" in all rewrite files Eval improvements (review items 14, 16): - awslabs#14: README — add query_plan_rewrite_evals to directory tree and eval section - awslabs#16: Add evals 206-210 covering LEFT JOIN, computation push, NOT IN with NULL warning, nested UNION ALL, and negative case (OR across different columns) - awslabs#7 (eval): Update eval 201 expectation — pg_amop instead of matrix Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Jun 30, 2026
…ction, rewrites, and workflow extraction (awslabs#162) * feat(dsql): enhance query plan explainability with type coercion detection and rewrite references - Add structured trigger phrases and routing criteria for query plan diagnosis - Add type coercion index bypass detection (implicit cast compatibility matrix) - Extend catalog queries with indexed column type retrieval - Add generic SQL rewrite reference (11 patterns: OR-to-IN, subquery unnesting, etc.) - Add DSQL-specific rewrite reference (reltuples estimate, split large joins for DP threshold) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat(dsql): extract query plan workflow, add rewrite evals - Extract Workflow 8 (query plan explainability) from SKILL.md into references/query-plan/workflow.md to stay under the 300 LOC limit - Wire query-rewrites-generic.md and query-rewrites-dsql-specific.md into the workflow (Phase 0 load list + Phase 2 evidence gathering) - Add behavioral evals (query_plan_rewrite_evals.json) covering type coercion detection, subquery unnesting, OR-to-IN, GROUP BY pushdown, large join splitting, and reltuples estimation - Add eval results (query_plan_rewrite_eval_results.md) with with-skill vs baseline comparison Validation: - validate-size.py: 275 lines (good) - validate-references.py: 0 broken links, 0 new orphans Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix: correct markdown link fragments in workflow.md TOC Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * style: apply dprint table formatting Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * refactor(dsql): address PR review — split rewrites, positive language, RFC keywords Review feedback from amaksimo: - Split query-rewrites-generic.md into 11 individual files under query-rewrites/ subdirectory to reduce context consumption - Split query-rewrites-dsql-specific.md into individual files - Convert monolithic files to index tables pointing to sub-files - Fix DATEADD() SQL Server syntax → PostgreSQL NOW() - INTERVAL - Flip negative language ("Do not apply") to positive ("Skip when") - Add RFC keywords (MUST, SHOULD, MAY) throughout - Remove psql fallback from workflow.md (enforce MCP usage) - Update plan-interpretation.md recommendation template with RFC language - Make Phase 0 loading explicit: MUST for core refs, SHOULD for rewrites Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix(dsql): address PR awslabs#162 review — correctness, references, evals Correctness fixes (review items 1-5): - #1: push-computation-to-constant — use NUMERIC column 'amount' to avoid integer division non-equivalence - #2: not-in-to-not-exists — add NULL semantics warning (NOT EXISTS does not preserve NOT IN's NULL-propagation; MUST confirm with user) - awslabs#3/awslabs#4: subquery-unnesting — prefer EXISTS form (true semi-join); document uniqueness precondition for JOIN+DISTINCT alternative - awslabs#5: subquery-unnesting-scalar — add COALESCE(s_count, 0) for COUNT/SUM (LEFT JOIN returns NULL, scalar returns 0) Dangling reference fixes (review items 6-8): - awslabs#6: workflow.md trigger table — "Phase 5" → reassessment re-entry - awslabs#7: Replace all "implicit cast compatibility matrix" references with "pg_amop query in catalog-queries.md" - awslabs#8: plan-interpretation.md L202 — fix cast-vs-operator contradiction Structural fixes (review items 9-14, 24): - awslabs#9: Hedge "integer family" claim with "at time of writing" + verify - awslabs#10: amopmethod=10003 — add provenance comment and verification SQL - awslabs#11: catalog-queries.md TOC — add 3 missing sections - awslabs#12: plan-interpretation.md TOC — add Type Coercion section - awslabs#13: SKILL.md — explicitly delegate routing to workflow.md - awslabs#24: workflow.md — remove em dashes from headings for clean anchors Other fixes (review items 21-23): - awslabs#21: reltuples-estimate — add staleness warning (MUST warn user) - awslabs#22: catalog-queries — add safe_query.build() note for placeholders - awslabs#23: "Skip when" → "SHOULD skip when" in all rewrite files Eval improvements (review items 14, 16): - awslabs#14: README — add query_plan_rewrite_evals to directory tree and eval section - awslabs#16: Add evals 206-210 covering LEFT JOIN, computation push, NOT IN with NULL warning, nested UNION ALL, and negative case (OR across different columns) - awslabs#7 (eval): Update eval 201 expectation — pg_amop instead of matrix Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix(dsql): address remaining PR awslabs#162 review items - awslabs#17: Downgrade eval results to qualitative comparison, record model and version, note n=1 and recommend n>=3 for production confidence - awslabs#18: SKILL.md is 281 lines (will update PR body) - awslabs#20: Strengthen awsknowledge fallback to MUST — refuse fallback when recommendation depends on exact limit value - awslabs#21: Already addressed in prior commit (reltuples staleness) - awslabs#15: Document manual-only status and future Python converter direction (per anwesham-lab's suggestion for deterministic rewrites) - awslabs#19: MCP mirror PR noted as follow-up in PR body Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * fix(dsql): address self-review findings — links, inclusive language, evals - Revert broken relative links in SKILL.md (mcp/.mcp.json, scripts/) back to correct ../../ paths - Rename blacklisted_customers → excluded_customers and blacklist → exclusion_list for inclusive language compliance - Fix stale 'implicit cast compatibility matrix' → pg_amop in eval results - Add eval results for 206–210 (LEFT JOIN, computation push, NOT IN NULL warning, nested UNION ALL, negative OR case) - Include hooks.json update * fix: remove stray conflict marker in evals README * style: apply dprint table formatting to eval results * fix(dsql): wire workflow.md and rewrite indexes into SKILL.md Addresses amaksimo's review comment: after rebase onto main, the Workflow 9 section lost its link to workflow.md and the rewrite index files, making all 16 new query-plan files unreachable orphans. - Add workflow.md as the entry gate in the reference table - Add query-rewrites-generic.md and query-rewrites-dsql-specific.md - Update Workflow 9 section to load workflow.md instead of listing the 4 Phase-0 files directly (workflow.md handles that routing) * fix(dsql): address review findings awslabs#4, awslabs#5, awslabs#7, awslabs#8, awslabs#9 - awslabs#4: COALESCE rule in subquery-unnesting-scalar.md restricted to COUNT only; SUM/MAX/MIN return NULL on empty sets in both forms - awslabs#5: verify-comment in catalog-queries.md changed from amname='btree' to amname='btree_index' (DSQL uses btree_index AM) - awslabs#7: workflow.md context disambiguation removes psql fallback offer, now says no MCP means no plan capture (consistent with Safety) - awslabs#8: split-large-joins.md example expanded from 7 to 11 tables, exceeding the stated DP threshold of 10; CTEs project explicit cols - awslabs#9: plan-interpretation.md recommendation template changed ::float to ::integer (only integer-family cross-type operators registered) * fix(dsql): correct safe_query substitution guidance in catalog-queries Lift the substitution rule to the file preamble with per-position guidance: identifier positions (FROM, GROUP BY) use ident(); string- literal positions (WHERE = '{schema}', IN ('{table}')) use allow() or regex(). The prior note incorrectly prescribed ident() for all positions, which would produce invalid SQL in WHERE clauses. * refactor(dsql): merge in-subquery-to-exists into subquery-unnesting-uncorrelated Delete redundant in-subquery-to-exists.md — same input shape and same rewrite as subquery-unnesting-uncorrelated.md. Merge the 'large result set' trigger and 'small static set' skip condition into the canonical file. Update index and eval 200 to route exclusively there. * style: apply dprint table formatting to workflow.md * fix(dsql): address merge-blocking review findings #1-awslabs#4 - #1: Strip surrounding quotes from all placeholders in catalog-queries so safe_query helpers (which emit their own quotes) don't double-quote. Add worked safe_query.build() example to preamble. - #2: DP threshold changed from 10 to 8 (validated: SHOW join_collapse_limit = 8 on live DSQL). Agent now instructed to SHOW the value rather than hardcoding. - awslabs#3: Remove pg_stat_user_tables.last_analyze cross-check (DSQL never populates it). Guard reltuples with GREATEST(..., 0) for the -1 sentinel on never-analyzed tables. - awslabs#4: Fix '11 generic' to '10 generic' in SKILL.md reference table. * feat(dsql): add blog learnings — filter model, DPU, CTE rewrite - Add Three-Layer Filter Model (Index Cond / Storage Filter / Query Processor Filter) with optimization table to plan-interpretation.md - Add Fixing Storage Lookups guidance (INCLUDE columns) with example - Add Cost Number Interpretation (startup ~100 is normal in DSQL) - Add DPU Interpretation (Read DPU as primary signal, optimization loop) - Add CTE late materialization as DSQL-specific rewrite pattern (defer Storage Lookups past LIMIT) - Update workflow.md Phase 1: recommend plain EXPLAIN first for expensive queries before EXPLAIN ANALYZE VERBOSE * chore: bump databases-on-aws plugin version to 1.4.0 --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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