fix(tools): detect databricks LIMIT by clause, not substring - #7219
fix(tools): detect databricks LIMIT by clause, not substring#7219santhiprakash wants to merge 2 commits into
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- Problem: DatabricksQueryToolSchema treated any query containing the letters "limit" as already capped, so SELECT * FROM limited_orders skipped the default LIMIT 1000. - Fix: detect a real LIMIT n / LIMIT ALL / FETCH FIRST n ROWS clause before appending row_limit. - Verification: uv run pytest lib/crewai-tools/tests/tools/test_databricks_query_tool.py -q -- 9 passed.
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughChangesThe Databricks query tool now detects actual Databricks limit detection
Suggested reviewers: Merge Risk: 🟡 Moderate · up to This change improves row-limit handling for identifiers containing “limit” and trailing statement terminators, but an unresolved clause-detection edge case could still yield invalid SQL or return more rows than configured. Resolve the regex behavior before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In
`@lib/crewai-tools/src/crewai_tools/tools/databricks_query_tool/databricks_query_tool.py`:
- Line 75: Normalize trailing whitespace in self.query before removing the
trailing semicolon in the row-limit handling guarded by _SQL_LIMIT_CLAUSE_RE, so
queries like SELECT * FROM limited_orders; have the terminator removed before
appending the LIMIT clause.
- Line 19: Update DatabricksQueryToolSchema.validate_input and
_SQL_LIMIT_CLAUSE_RE to detect LIMIT clauses using SQL-aware parsing that
ignores comments and string literals, while supporting Databricks foldable
expressions such as LIMIT length('SPARK') and the complete LIMIT grammar.
Preserve the configured row-cap behavior, and add regression tests covering
expression limits plus LIMIT text inside literals or comments.
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VANDRANKI
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Community review, not a merge gate.
Traced this fully. lib/crewai-tools/src/crewai_tools/tools/databricks_query_tool/databricks_query_tool.py's validate_input used "limit" not in self.query.lower() to decide whether to append a LIMIT clause, which is a plain substring check and false-positives on any query touching a table or column literally named limit or containing it as a substring (e.g. limited_orders), silently skipping the row cap on an otherwise-unbounded query.
The new regex (?is)\b(?:LIMIT\s+(?:ALL|\d+)\b|FETCH\s+(?:FIRST|NEXT)\s+\d+\s+ROWS?\b) only matches an actual LIMIT/FETCH clause (LIMIT followed by a number or ALL, or FETCH FIRST/NEXT n ROWS), not a bare identifier. I hand-checked it against all the new test cases: SELECT limit FROM orders doesn't match (column named limit, cap still appended), LIMIT ALL and FETCH FIRST 10 ROWS ONLY both match (no double-cap), and limited_orders as a table name doesn't match. The word boundary before LIMIT/FETCH and the required trailing number/ALL/ROWS token are what make this correct where the old substring check wasn't.
Straightforward, well-scoped, well-tested fix.
… row limit
- Problem: a query ending in `; ` (semicolon plus trailing whitespace) kept its
statement-terminating semicolon after rstrip(';'), so the appended row cap
landed after it and produced invalid SQL.
- Fix: strip any trailing mix of semicolons and whitespace before appending the
LIMIT clause; add regression tests for both trailing-space and newline cases.
- Verification: uv run pytest lib/crewai-tools/tests/tools/test_databricks_query_tool.py -q → 11 passed; ruff check + format clean on both files.
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llm-generatedlabel; this account cannot add labels oncrewAIInc/crewAI(REST 403). Please applyllm-generated.Problem
DatabricksQueryToolSchemadecides whether to appendrow_limitwith a substring check:Any identifier that contains those letters skips the cap. Reproduced on current main:
SELECT * FROM orders… LIMIT 1000;(intended)SELECT * FROM limited_ordersSELECT * FROM orders LIMIT 5Self-sourced. Independent of #6987 / #7120.
Triage / Root cause
"limit" in query.lower()matches table/column names (limited_orders,credit_limit) as if they were aLIMITclause, so the default 1000-row cap never applies.Fix
Detect a real clause (
LIMIT n,LIMIT ALL,FETCH FIRST/NEXT n ROWS) before appendingrow_limit. Identifiers that merely contain"limit"are capped as intended.Verification
Before:
After:
9 passed.
Notes / Risks
SELECT limit FROM ordersnow correctly getsLIMIT 1000appended (the column name is not a LIMIT clause).Existing
LIMIT n/LIMIT ALL/FETCH FIRST n ROWS ONLYqueries are not rewritten.Does not add read-only SQL validation; this tool is a general Databricks query runner.
Known tradeoff (also raised by the automated review on fix(tools): detect databricks LIMIT by clause, not substring #7121): the clause regex scans raw SQL, so a
LIMITinside a string literal, comment, or nested subquery can suppress the outer default cap, and foldable expressions likeLIMIT length('SPARK')are treated as "has a limit". A token-aware scanner would close those corners but is a much larger change; this fix still strictly improves on the substring check it replaces. Happy to follow up if maintainers want the scanner.Fixes #7218