zetasql 0.1.3

Python port of Google's ZetaSQL - SQL analysis and parsing library

ZetaSQL Python

Python port of Google's ZetaSQL - a powerful SQL analysis and parsing library.

Overview

ZetaSQL Python brings Google's SQL analyzer to the Python ecosystem, providing:

• SQL Analysis: Parse and analyze SQL statements with full type checking
• Name Resolution: Resolve table and column references against catalogs
• Query Building: Construct and manipulate SQL AST programmatically
• Expression Evaluation: Execute queries and expressions with parameter binding
• Java-like API: Familiar builder patterns and fluent interfaces

This project is built on top of zetasql-wasi, which provides the WebAssembly build of ZetaSQL, enabling ZetaSQL functionality in Python environments.

Installation

pip install zetasql

Requirements: Python 3.10+

Quick Start

from zetasql.api import Analyzer, CatalogBuilder, TableBuilder
from zetasql.types import AnalyzerOptions, LanguageOptions, TypeKind, ZetaSQLBuiltinFunctionOptions

# Create a catalog with a table
table = (
    TableBuilder("users")
    .add_column("id", TypeKind.TYPE_INT64)
    .add_column("name", TypeKind.TYPE_STRING)
    .add_column("email", TypeKind.TYPE_STRING)
    .build()
)

# Build catalog with builtin functions
lang_opts = LanguageOptions.maximum_features()
builtin_opts = ZetaSQLBuiltinFunctionOptions(language_options=lang_opts)

catalog = (
    CatalogBuilder("mydb")
    .add_table(table)
    .with_builtin_functions(builtin_opts)
    .build()
)

# Analyze SQL
options = AnalyzerOptions(language_options=lang_opts)
analyzer = Analyzer(options, catalog)
stmt = analyzer.analyze_statement("SELECT name, email FROM users WHERE id > 100")

print(f"Analyzed {len(stmt.output_column_list)} output columns")
# Output: Analyzed 2 output columns

Key Features

🔍 SQL Parsing & Analysis

Parse SQL syntax or perform full semantic analysis:

from zetasql.api import Parser, Analyzer

# Parser: Syntax-only parsing (fast, no catalog needed)
ast_stmt = Parser.parse_statement_static("SELECT * FROM users")

# Analyzer: Full semantic analysis with type checking
resolved_stmt = analyzer.analyze_statement("SELECT * FROM users")

🌲 AST Traversal

Visit and inspect SQL parse trees with the Visitor pattern:

from zetasql.api import Parser, ASTNodeVisitor

class TableNameCollector(ASTNodeVisitor):
    def __init__(self):
        super().__init__()
        self.tables = []
    
    def visit_ASTPathExpression(self, node):
        if node.names:
            self.tables.append(".".join([n.identifier for n in node.names]))

stmt = Parser.parse_statement_static("SELECT * FROM users JOIN orders")
visitor = TableNameCollector()
visitor.visit(stmt)
print(visitor.tables)  # ['users', 'orders']

🏗️ Builder Pattern APIs

Fluent interfaces for constructing catalogs, tables, and functions:

from zetasql.api import CatalogBuilder
from zetasql.types import LanguageOptions, ZetaSQLBuiltinFunctionOptions

lang_opts = LanguageOptions.maximum_features()
builtin_opts = ZetaSQLBuiltinFunctionOptions(language_options=lang_opts)

catalog = (
    CatalogBuilder("shop")
    .add_table(orders_table)
    .add_table(products_table)
    .with_builtin_functions(builtin_opts)
    .build()
)

⚡ Query Execution

Execute queries with parameter binding and table data:

from zetasql.api import PreparedQuery, create_table_content

data = create_table_content([[1, "Alice"], [2, "Bob"]])
query = PreparedQuery("SELECT * FROM users WHERE id = @user_id", options, catalog)
result = query.execute(parameters={"user_id": 1}, table_content={"users": data})

🎯 Type-Safe Values

Create and manipulate typed SQL values:

from zetasql.api import Value

int_val = Value.int64(42)
str_val = Value.string("hello")
array_val = Value.array([Value.int64(1), Value.int64(2)])

📦 ProtoModel System

Pythonic wrappers around protobuf messages with real inheritance:

from zetasql.types import ResolvedLiteral

literal = ResolvedLiteral(...)
type_kind = literal.type.type_kind  # Direct access, no parent chain
isinstance(literal, ResolvedExpr)   # True - real inheritance!

Documentation

• Getting Started Guide - Detailed tutorials and examples
• API Reference - Complete API documentation
• ProtoModel Inheritance Hierarchy - The inheritance structure of the ProtoModel classes
• Architecture - Project structure and design

Development

# Clone the repository
git clone https://github.com/heoh/zetasql-py.git
cd zetasql-py

# Create virtual environment
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

# Install in development mode
pip install -e ".[dev]"

# Run tests
pytest

# Run linter
ruff check src/ tests/

See CONTRIBUTING.md for detailed contribution guidelines.

Project Status

This project is in alpha stage. The API is functional but may change as we refine the design. Feedback and contributions are welcome!

License

Apache License 2.0 - see LICENSE file for details.

This is an unofficial Python port of Google's ZetaSQL (also Apache 2.0 licensed) and is not affiliated with Google.

Acknowledgments

• Original ZetaSQL project by Google
• Built on zetasql-wasi - WebAssembly build of ZetaSQL
• Inspired by the Java ZetaSQL API design