trino-sql-validator

Fast Trino SQL syntax validator — a Python library whose core is written in Rust and compiled to a native extension via PyO3 + maturin.

Installable from PyPI:

pip install trino-sql-validator

Quickstart

from trino_sql_validator import validate, validate_file

# A string with one or many statements
result = validate("SELECT 1; SELECT * FROM t WHERE a > 0;")
assert result.valid
assert result.statement_count == 2

# Invalid SQL returns a value, never raises
result = validate("SELECT * FORM t")
assert not result.valid
print(result.error)          # e.g. "Expected: end of statement, found: FORM at line 1, column 10"
print(result.error.line)     # 1

# Validate a file
result = validate_file("queries.sql", dialect="trino")

Invalid SQL (and files containing it) is returned as a ValidationResult; it is not raised as an exception. Only genuine misuse (unknown dialect, unreadable file) raises.

Function-name warnings

For dialect="trino", validate() also checks that every function called in the SQL exists in the documented Trino catalog. Unknown names are reported as non-fatal warnings — valid stays True because syntax is fine:

result = validate("SELECT marh(1.5)")      # round() misspelled
assert result.valid
print(result.warnings)                     # (FunctionWarning(name='marh', line=1, column=8),)
print(result.unknown_functions)            # ['marh']

The catalog is auto-generated from the Trino docs and only checks name existence, not argument count or types. hive/generic dialects skip this check.

Dialects

"trino" (default) — Trino-flavored with a custom override tuned for Presto/Trino syntax (LIMIT ALL, backslash escapes, etc.).
"hive" and "generic" — offered as permissive alternates.

Known limitations

sqlparser-rs (the parser we use) performs syntax validation, not semantic analysis. It may accept SQL that Trino would reject at analysis time (unknown columns/tables, duplicate columns), and it can reject exotic Trino-specific DDL. For the overwhelming majority of SELECT/DDL statements the results are accurate. See plan/roadmap.md for the path toward stricter Trino fidelity.

Development

See AGENTS.md for setup, internal conventions, and release steps. Key commands:

python3 -m venv .venv && source .venv/bin/activate
pip install -U pip maturin && pip install -e ".[dev]"
maturin develop          # build + install native ext into the venv
cargo test               # Rust tests
pytest -q                # Python tests
cargo fmt --check        # formatting
cargo clippy --all-targets -- -D warnings

License

MIT

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