CQL Core

CQL (CSV Query Language) is a SQL-like query language designed specifically for querying and manipulating CSV files in PHP. It provides a familiar SQL syntax for filtering, joining, and transforming CSV data without requiring a database.

Important

This is v0.1.0 - a read-only query library. Write operations (INSERT, UPDATE, DELETE) are planned for future releases. See CHANGELOG.md for details.

Features

SQL-like Syntax - Write queries using familiar SELECT, FROM, WHERE, JOIN, and GROUP BY statements
Aggregate Functions - COUNT, SUM, AVG, MIN, MAX for data analysis
Date Functions - YEAR, MONTH, DAY, DATE for date-based analysis
Multiple Data Sources - Define and query multiple CSV files in a single query
JOIN Support - Perform INNER, LEFT, and RIGHT joins between CSV files
Streaming Mode - Process large files (>50MB) with minimal memory usage
Expression Engine - Support for mathematical and logical expressions in WHERE clauses
Column Aliasing - Rename columns in your result set
Wildcard Selection - Select all columns or prefix-specific columns with * syntax
Header Detection - Automatically handle CSVs with or without headers
Simple Facade API - Clean, intuitive interface with convenience methods
Type-Safe - Built with PHP 8.4+ features including readonly classes and enums
Extensible - Modular operator system for easy extension
Well Tested - 50 tests with 186 assertions covering core functionality

Requirements

PHP 8.4 or higher
Composer

Installation

composer require absorbing/cql-core

Quick Start

<?php

require 'vendor/autoload.php';

use CQL\CQL;

// Create a CQL instance
$cql = new CQL();

// Execute a query
$results = $cql->execute("
    DEFINE 'users.csv' AS users WITH HEADERS
    SELECT name, age
    FROM users
    WHERE age > 25
");

// Iterate over results
foreach ($results as $row) {
    echo "{$row['name']} is {$row['age']} years old\n";
}

// Or use convenience methods
$array = $cql->query($query);        // Returns array
$first = $cql->first($query);        // Returns first row
$count = $cql->count($query);        // Returns count

Minimum Query

The simplest valid CQL query requires:

DEFINE 'file.csv' AS alias WITH HEADERS
SELECT *
FROM alias

Complete Query

A query with all optional features:

DEFINE 'users.csv' AS users WITH HEADERS
DEFINE 'orders.csv' AS orders WITH HEADERS
SELECT users.name, orders.product, orders.amount
FROM users
LEFT JOIN orders ON users.id = orders.user_id
WHERE orders.amount > 100

Query Syntax

Language Reference

CQL queries follow a SQL-like syntax with specific requirements:

Component	Required	Description
`DEFINE`	Yes	At least one data source definition
`SELECT`	Yes	Column selection
`FROM`	Yes	Primary data source
`WHERE`	No	Filter conditions
`JOIN`	No	Join additional data sources
`GROUP BY`	No	Group rows for aggregation
`AS`	No	Aliases for tables and columns

Query Structure:

DEFINE 'file.csv' AS alias [WITH|WITHOUT HEADERS] [COLUMNS (col1, col2, ...)]
[DEFINE 'file2.csv' AS alias2 ...]
SELECT column1, column2, ... | *
FROM alias
[JOIN alias2 ON alias.key = alias2.key]
[WHERE condition]

CQL API

The CQL class provides a simple interface for executing queries:

use CQL\CQL;

// Basic usage
$cql = new CQL();
$results = $cql->execute($query);

// Convenience methods
$array = $cql->query($query);   // Returns array
$first = $cql->first($query);   // Returns first row
$count = $cql->count($query);   // Returns row count

// Static factory methods
$cql = CQL::auto();              // Automatic mode (default)
$cql = CQL::streaming();         // Always stream
$cql = CQL::normal();            // Never stream
$cql = CQL::auto(10 * 1024 * 1024); // Custom 10MB threshold

// Configuration
$cql = new CQL([
    'streaming' => true,
    'autoStreamingThreshold' => 20 * 1024 * 1024
]);

// Fluent configuration
$cql = (new CQL())
    ->setStreaming(true)
    ->setAutoStreamingThreshold(30 * 1024 * 1024);

DEFINE Statement

The DEFINE statement declares a CSV data source and assigns it an alias.

Syntax:

DEFINE 'path/to/file.csv' AS alias [WITH|WITHOUT HEADERS] [COLUMNS (col1, col2, ...)]

Parameters:

Parameter	Required	Description	Default
`'path/to/file.csv'`	Yes	Path to CSV file (single or double quotes)	-
`AS alias`	No	Table alias	Auto-generated from filename
`WITH HEADERS`	No	CSV has header row	-
`WITHOUT HEADERS`	No	CSV has no headers (generates column_1, column_2, etc.)	Default if neither specified
`COLUMNS (...)`	No	Explicitly define column names	Auto-generated or from headers

Examples:

-- Minimal: CSV with headers
DEFINE 'users.csv' AS users WITH HEADERS

-- CSV without headers (auto-generates column names)
DEFINE 'data.csv' AS data WITHOUT HEADERS

-- Explicitly define column names
DEFINE 'data.csv' AS data WITHOUT HEADERS COLUMNS (id, name, email)

-- Auto-generate alias from filename (becomes 'users')
DEFINE 'users.csv' WITH HEADERS

-- Multiple data sources
DEFINE 'users.csv' AS users WITH HEADERS
DEFINE 'orders.csv' AS orders WITH HEADERS

Rules:

At least one DEFINE is required per query
Aliases must be unique within a query
Aliases are case-sensitive
File paths are relative to execution directory

SELECT Statement

Select specific columns or use wildcards to select all columns.

Syntax:

SELECT column1, column2, ... | * | alias.*
SELECT column AS alias

Options:

Option	Description	Example
`column`	Select specific column by name	`SELECT name`
`alias.column`	Select column with table qualifier	`SELECT users.name`
`*`	Select all columns from all tables	`SELECT *`
`alias.*`	Select all columns from specific table	`SELECT users.*`
`column AS alias`	Rename column in results	`SELECT name AS full_name`

Examples:

-- Select specific columns
SELECT name, age FROM users

-- Select all columns
SELECT * FROM users

-- Select all columns from specific table (useful in JOINs)
SELECT users.*, orders.total FROM users JOIN orders ON users.id = orders.user_id

-- Column aliasing
SELECT name AS full_name, age AS years FROM users

-- Qualified column names
SELECT users.name, users.email FROM users

-- Mix of qualified and unqualified
SELECT users.name, age FROM users

Rules:

At least one column or wildcard is required
Column names are case-sensitive
In JOINs, ambiguous columns should be qualified with table alias
Wildcards can be mixed with specific columns

FROM Statement

Specify the primary data source for the query.

Syntax:

FROM alias

Parameters:

Parameter	Required	Description
`alias`	Yes	Must match a DEFINE alias

Examples:

FROM users
FROM data
FROM my_table

Rules:

Exactly one FROM clause is required
Alias must be defined in a DEFINE statement
Alias is case-sensitive

WHERE Clause

Filter rows based on conditions using comparison and logical operators.

Syntax:

WHERE condition
WHERE column operator value
WHERE expression operator expression

Supported Operators:

Category	Operator	Description
Comparison	`=`	Equal
	`!=`, `<>`	Not equal
	`>`	Greater than
	`<`	Less than
	`>=`	Greater than or equal
	`<=`	Less than or equal
Logical	`AND`	Logical AND
	`OR`	Logical OR
	`NOT`	Logical NOT
Mathematical	`+`	Addition
	`-`	Subtraction
	`*`	Multiplication
	`/`	Division
	`%`	Modulus
	`^`	Power (exponentiation)

Examples:

-- Simple comparison
WHERE age > 18

-- Logical operators
WHERE age > 18 AND status = 'active'
WHERE age < 18 OR age > 65

-- Mathematical expressions
WHERE price * quantity > 1000
WHERE (salary + bonus) > 100000

-- String comparison
WHERE name = 'John'
WHERE status != 'inactive'

-- Parentheses for precedence
WHERE (age > 18 AND age < 65) OR status = 'premium'

Rules:

WHERE clause is optional
Only one condition is currently supported (no complex AND/OR chains)
Column names must exist in the data source
String values must be in single quotes
Numeric values don't need quotes

Limitations:

Complex nested conditions not yet supported
IN operator not yet implemented
LIKE operator not yet implemented
BETWEEN operator not yet implemented

JOIN Clause

Join multiple CSV files together.

Syntax:

[INNER|LEFT|RIGHT] JOIN right_alias ON left_alias.key = right_alias.key

Join Types:

Join Type	Description
`INNER JOIN` (default)	Returns rows with matches in both tables
`LEFT JOIN`	Returns all rows from left table, matched rows from right
`RIGHT JOIN`	Returns all rows from right table, matched rows from left

Parameters:

Parameter	Required	Description
`right_alias`	Yes	Alias of table to join (must be defined)
`ON`	Yes	Join condition keyword
`left_alias.key`	Yes	Column from left table
`right_alias.key`	Yes	Column from right table

Examples:

-- Inner join (default)
DEFINE 'users.csv' AS users WITH HEADERS
DEFINE 'orders.csv' AS orders WITH HEADERS
SELECT users.name, orders.product
FROM users
JOIN orders ON users.id = orders.user_id

-- Left join
SELECT users.name, orders.product
FROM users
LEFT JOIN orders ON users.id = orders.user_id

-- Multiple joins
DEFINE 'users.csv' AS users WITH HEADERS
DEFINE 'orders.csv' AS orders WITH HEADERS
DEFINE 'products.csv' AS products WITH HEADERS
SELECT users.name, orders.order_id, products.name
FROM users
JOIN orders ON users.id = orders.user_id
JOIN products ON orders.product_id = products.id

Rules:

JOIN is optional
Multiple JOINs are supported
Both tables must be defined with DEFINE
Join keys must exist in both tables
Join condition must use = operator
Column names in results are namespaced (e.g., users.name, orders.product)

Limitations:

Only equality joins supported (no >, <, etc.)
No self-joins
FULL OUTER JOIN not yet implemented

Aggregate Functions

Perform calculations across multiple rows.

Syntax:

SELECT function(column) [AS alias]
SELECT function(*)

Supported Functions:

Function	Description	Example
`COUNT(*)`	Count all rows	`COUNT(*) AS total`
`COUNT(column)`	Count non-null values	`COUNT(name) AS users`
`SUM(column)`	Sum of numeric values	`SUM(amount) AS total_sales`
`AVG(column)`	Average of numeric values	`AVG(price) AS avg_price`
`MIN(column)`	Minimum value	`MIN(age) AS youngest`
`MAX(column)`	Maximum value	`MAX(salary) AS highest_paid`

Examples:

-- Overall statistics (no GROUP BY)
DEFINE 'sales.csv' AS sales WITH HEADERS
SELECT COUNT(*) AS total_orders,
       SUM(amount) AS total_revenue,
       AVG(amount) AS avg_order_value
FROM sales

-- Group by category
SELECT category,
       COUNT(*) AS order_count,
       SUM(quantity) AS total_quantity
FROM sales
GROUP BY category

-- Multiple aggregates with GROUP BY
SELECT region,
       COUNT(*) AS orders,
       AVG(price) AS avg_price,
       MAX(quantity) AS max_quantity
FROM sales
GROUP BY region

-- Filter before aggregating
SELECT category, SUM(amount) AS revenue
FROM sales
WHERE amount > 100
GROUP BY category

Rules:

Aggregate functions can be used with or without GROUP BY
Without GROUP BY, aggregates apply to entire dataset
With GROUP BY, aggregates apply to each group
Can mix aggregates with GROUP BY columns in SELECT
Aliases are recommended for aggregate results

Limitations:

HAVING clause not yet implemented
Cannot filter on aggregate results (use PHP post-processing)
Cannot use aggregates in WHERE clause

Date Functions

Extract date components and perform date-based analysis.

Syntax:

SELECT function(date_column) [AS alias]
WHERE function(date_column) operator value
GROUP BY function(date_column)

Supported Functions:

Function	Description	Returns	Example
`YEAR(date)`	Extract year	Integer (2024)	`YEAR(order_date)`
`MONTH(date)`	Extract month	Integer (1-12)	`MONTH(order_date)`
`DAY(date)`	Extract day	Integer (1-31)	`DAY(order_date)`
`DATE(date)`	Format as date	String (YYYY-MM-DD)	`DATE(created_at)`

Examples:

-- Extract date components
DEFINE 'orders.csv' AS orders WITH HEADERS
SELECT customer,
       order_date,
       YEAR(order_date) AS year,
       MONTH(order_date) AS month,
       DAY(order_date) AS day
FROM orders

-- Group by month
SELECT MONTH(order_date) AS month,
       COUNT(*) AS order_count,
       SUM(amount) AS revenue
FROM orders
GROUP BY MONTH(order_date)

-- Filter by date component
SELECT customer, amount
FROM orders
WHERE MONTH(order_date) = 2

-- Quarterly analysis
SELECT COUNT(*) AS q1_orders,
       SUM(amount) AS q1_revenue
FROM orders
WHERE MONTH(order_date) <= 3

Rules:

Date functions work with standard date formats (YYYY-MM-DD, etc.)
Can be used in SELECT, WHERE, and GROUP BY clauses
Returns NULL for invalid dates
Date parsing uses PHP's DateTime class

Supported Date Formats:

YYYY-MM-DD (2024-01-15)
YYYY/MM/DD (2024/01/15)
DD-MM-YYYY (15-01-2024)
Any format supported by PHP's DateTime constructor

Limitations

Not Yet Supported

The following SQL features are not currently implemented:

Aggregation:

GROUP BY - Grouping rows
HAVING - Filter grouped results
COUNT(), SUM(), AVG(), MIN(), MAX() - Aggregate functions
DISTINCT - Remove duplicates

Sorting & Limiting:

ORDER BY - Sort results
LIMIT - Limit number of results
OFFSET - Skip results

Advanced Filtering:

IN (value1, value2, ...) - Match multiple values
LIKE - Pattern matching
BETWEEN - Range queries
Complex nested WHERE conditions

Data Modification:

INSERT - Add rows
UPDATE - Modify rows
DELETE - Remove rows

Advanced Joins:

FULL OUTER JOIN - Full outer join
Self-joins
Non-equality joins (>, <, etc.)

Other:

Subqueries
UNION - Combine queries
Window functions
CTEs (Common Table Expressions)

Workarounds

Many of these features can be implemented in PHP after querying:

$cql = new CQL();
$results = $cql->query($query);

// Sorting
usort($results, fn($a, $b) => $a['age'] <=> $b['age']);

// Limiting
$limited = array_slice($results, 0, 10);

// Distinct
$unique = array_unique($results, SORT_REGULAR);

// Aggregation
$total = array_sum(array_column($results, 'amount'));
$average = $total / count($results);

// Grouping
$grouped = [];
foreach ($results as $row) {
    $grouped[$row['category']][] = $row;
}

Complete Examples

Example 1: Basic Filtering

<?php

use CQL\CQL;

// users.csv:
// id,name,age,status
// 1,Alice,30,active
// 2,Bob,25,inactive
// 3,Charlie,35,active

$cql = new CQL();

$results = $cql->execute("
    DEFINE 'users.csv' AS users WITH HEADERS
    SELECT name, age
    FROM users
    WHERE age >= 30 AND status = 'active'
");

// Output:
// {"name":"Alice","age":"30"}
// {"name":"Charlie","age":"35"}

Example 2: Joining Multiple Files

<?php

use CQL\CQL;

// users.csv:
// id,name
// 1,Alice
// 2,Bob

// orders.csv:
// order_id,user_id,product,amount
// 101,1,Laptop,1200
// 102,1,Mouse,25
// 103,2,Keyboard,75

$cql = new CQL();

$results = $cql->execute("
    DEFINE 'users.csv' AS users WITH HEADERS
    DEFINE 'orders.csv' AS orders WITH HEADERS
    SELECT users.name, orders.product, orders.amount
    FROM users
    JOIN orders ON users.id = orders.user_id
    WHERE orders.amount > 50
");

// Output:
// {"users.name":"Alice","orders.product":"Laptop","orders.amount":"1200"}
// {"users.name":"Bob","orders.product":"Keyboard","orders.amount":"75"}

Example 3: Column Aliasing

<?php

use CQL\CQL;

$cql = new CQL();

$results = $cql->execute("
    DEFINE 'employees.csv' AS emp WITH HEADERS
    SELECT emp.first_name AS name, emp.salary AS pay
    FROM emp
    WHERE emp.department = 'Engineering'
");

// Output uses aliased column names:
// {"name":"John","pay":"95000"}
// {"name":"Jane","pay":"105000"}

Example 4: Mathematical Expressions

<?php

use CQL\CQL;

// products.csv:
// name,price,quantity
// Widget,10.50,100
// Gadget,25.00,50
// Doohickey,5.75,200

$cql = new CQL();

$results = $cql->execute("
    DEFINE 'products.csv' AS products WITH HEADERS
    SELECT name, price, quantity
    FROM products
    WHERE price * quantity > 1000
");

// Output:
// {"name":"Gadget","price":"25.00","quantity":"50"}
// {"name":"Doohickey","price":"5.75","quantity":"200"}

Example 5: Streaming Mode for Large Files

<?php

use CQL\CQL;

// For large CSV files (>50MB), use streaming mode to reduce memory usage

// Explicit streaming
$cql = CQL::streaming();
$results = $cql->execute("
    DEFINE 'large_dataset.csv' AS data WITH HEADERS
    SELECT id, name, value
    FROM data
    WHERE value > 1000
");

// Automatic mode (recommended) - decides based on file size
$cql = CQL::auto();
$results = $cql->execute($query);

// Custom threshold
$cql = CQL::auto(10 * 1024 * 1024); // 10MB threshold
$results = $cql->execute($query);

Architecture

CQL Core is built with a clean, modular architecture consisting of three main components:

1. Lexer (Tokenization)

Breaks down query strings into tokens (keywords, identifiers, operators, etc.)

2. Parser (Syntax Analysis)

Converts tokens into an Abstract Syntax Tree (AST) representing the query structure

3. Interpreter (Execution)

Executes the parsed query against CSV data sources and returns results

4. Data Layer

CSVDataSource - Handles CSV file loading with streaming support
Collection - Functional data manipulation with filter, map, and iteration

All of these components are accessed through the simple CQL facade class, which handles the entire pipeline automatically.

Exception Handling

CQL Core provides specific exceptions for different error scenarios:

Exception	Purpose
`DataSourceException`	CSV file errors (not found, permissions, format issues)
`InterpreterException`	Execution errors (undefined aliases, ambiguous columns)
`LexerException`	Tokenization errors
`ParserException`	Parsing errors (unexpected tokens, malformed syntax)
`SyntaxException`	Query syntax errors (invalid keywords, structure)

use CQL\CQL;
use CQL\Exceptions\{
    DataSourceException,
    InterpreterException,
    SyntaxException
};

try {
    $cql = new CQL();
    $results = $cql->execute($query);
} catch (DataSourceException $e) {
    // Handle file not found, permission errors, etc.
    echo "Data source error: " . $e->getMessage();
} catch (SyntaxException $e) {
    // Handle invalid query syntax
    echo "Syntax error: " . $e->getMessage();
} catch (InterpreterException $e) {
    // Handle execution errors
    echo "Execution error: " . $e->getMessage();
}

Advanced Usage

Custom Operators

Extend the operator system by implementing operator interfaces:

use CQL\Engine\Operators\BaseComparisonOperator;
use CQL\Engine\Operators\Contracts\ComparisonOperatorInterface;

class LikeOperator extends BaseComparisonOperator implements ComparisonOperatorInterface
{
    public static function symbols(): array
    {
        return ['LIKE'];
    }

    public static function evaluate(mixed $left, mixed $right): bool
    {
        $pattern = str_replace('%', '.*', preg_quote($right, '/'));
        return (bool) preg_match("/^{$pattern}$/i", $left);
    }
}

// Register the operator
use CQL\Engine\Operators\Registry\OperatorRegistry;
OperatorRegistry::register(LikeOperator::class);

Working with Results

Results are returned as a Collection object with helpful methods:

$cql = new CQL();
$results = $cql->execute($query);

// Get result count
$count = $results->count();

// Convert to array
$array = $results->toArray();

// Get first result
$first = $results->first();

// Chain operations
$filtered = $results
    ->filter(fn($row) => $row['age'] > 30)
    ->map(fn($row) => ['name' => strtoupper($row['name'])]);

// Iterate
foreach ($results as $row) {
    // Process each row
}

// Or use convenience methods directly
$array = $cql->query($query);   // Returns array
$first = $cql->first($query);   // Returns first row
$count = $cql->count($query);   // Returns count

Performance Considerations

Memory Management

CQL offers three modes for handling CSV files:

1. Normal Mode - Explicitly loads entire CSV into memory

Best for: Small to medium files (<50MB)
Usage: CQL::normal()
Pros: Faster query execution, supports complex operations
Cons: High memory usage for large files

2. Streaming Mode - Explicitly processes rows one at a time

Best for: Large files (>50MB)
Usage: CQL::streaming()
Pros: Minimal memory footprint, handles files of any size
Cons: Slightly slower for small files, still loads results into memory

3. Automatic Mode - Automatically selects based on file size

Best for: Unknown file sizes, dynamic workloads (recommended)
Usage: new CQL() or CQL::auto()
Usage: new Interpreter($ast, streaming: null) or new Interpreter($ast)
Default threshold: 50 MB (configurable)
Pros: No manual decision needed, optimal for most cases
Cons: Requires file size check

Mode Selection Examples:

use CQL\CQL;

// Explicit normal mode (always load into memory)
$cql = CQL::normal();

// Explicit streaming mode (always stream)
$cql = CQL::streaming();

// Automatic mode with default 50MB threshold (recommended)
$cql = new CQL();
// or
$cql = CQL::auto();

// Automatic mode with custom 10MB threshold
$cql = CQL::auto(10 * 1024 * 1024);

// Configuration via constructor
$cql = new CQL([
    'streaming' => true,
    'autoStreamingThreshold' => 20 * 1024 * 1024
]);

Performance Comparison:

File Size	Mode	Memory Usage	Speed
1000 rows (~22KB)	Normal	~500 KB	Fast
1000 rows (~22KB)	Streaming	~0 KB	Very Fast
100,000 rows (~2MB)	Normal	~50 MB	Fast
100,000 rows (~2MB)	Streaming	~5 MB	Fast
1,000,000 rows (~20MB)	Normal	~500 MB	Slow
1,000,000 rows (~20MB)	Streaming	~50 MB	Medium

Other Performance Tips

Joins: Join operations create in-memory indexes. Multiple joins on large datasets may consume significant memory even in streaming mode.
Filtering: WHERE clauses are applied during data loading in streaming mode, reducing memory usage.
File Format: Ensure CSV files are well-formed to avoid parsing errors.
Caching: Consider caching parsed ASTs for frequently-executed queries.

Limitations

No Aggregations: Currently no support for GROUP BY, COUNT, SUM, AVG, etc.
No Sorting: ORDER BY is not yet implemented
No Limits: LIMIT and OFFSET are not yet implemented
Single WHERE Condition: Complex WHERE clauses with multiple conditions are limited
No Subqueries: Nested queries are not supported
No INSERT/UPDATE/DELETE: Read-only operations only

Roadmap

Future features under consideration:

Testing

Run the test suite:

composer test

Run static analysis:

vendor/bin/phpstan analyze

Run code style checks:

vendor/bin/phpcs --standard=.phpcs.xml src

Contributing

Contributions are welcome! Please:

Fork the repository
Create a feature branch
Write tests for new functionality
Ensure all tests pass
Submit a pull request

License

MIT License - see LICENSE file for details

Credits

Developed by the Absorbing team.

Support

Issues: GitHub Issues
Discussions: GitHub Discussions

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examples		examples
src/CQL		src/CQL
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CHANGELOG.md		CHANGELOG.md
README.md		README.md
RELEASE_CHECKLIST.md		RELEASE_CHECKLIST.md
VERSION		VERSION
composer.json		composer.json
composer.lock		composer.lock
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phpunit.xml		phpunit.xml

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CQL Core

Features

Requirements

Installation

Quick Start

Minimum Query

Complete Query

Query Syntax

Language Reference

CQL API

DEFINE Statement

SELECT Statement

FROM Statement

WHERE Clause

JOIN Clause

Aggregate Functions

Date Functions

Limitations

Not Yet Supported

Workarounds

Complete Examples

Example 1: Basic Filtering

Example 2: Joining Multiple Files

Example 3: Column Aliasing

Example 4: Mathematical Expressions

Example 5: Streaming Mode for Large Files

Architecture

1. Lexer (Tokenization)

2. Parser (Syntax Analysis)

3. Interpreter (Execution)

4. Data Layer

Exception Handling

Advanced Usage

Custom Operators

Working with Results

Performance Considerations

Memory Management

Other Performance Tips

Limitations

Roadmap

Testing

Contributing

License

Credits

Support

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