Struct WindowProjector 

pub struct WindowProjector;

Window function result projector.

Transforms SQL query results into GraphQL-compatible JSON format.

Implementations

impl WindowProjector

pub fn project( rows: Vec<HashMap<String, Value>>, _plan: &WindowExecutionPlan, ) -> Result<Value>

Project SQL window function results to GraphQL JSON.

Arguments

• rows - SQL result rows as HashMaps (column name → value)
• plan - Window execution plan (for metadata like aliases)

Returns

GraphQL-compatible JSON array of objects

Example

let rows = vec![
    hashmap!{
        "revenue" => json!(100.00),
        "category" => json!("Electronics"),
        "rank" => json!(1)
    }
];

let result = WindowProjector::project(rows, &plan)?;
// result: [{"revenue": 100.00, "category": "Electronics", "rank": 1}]

pub fn wrap_in_data_envelope(projected: Value, query_name: &str) -> Value

Wrap projected results in a GraphQL data envelope.

Arguments

• projected - The projected JSON value (array of objects)
• query_name - The GraphQL field name (e.g., “sales_window”)

Returns

Complete GraphQL response structure

Example

let projected = json!([{"rank": 1}, {"rank": 2}]);
let response = WindowProjector::wrap_in_data_envelope(projected, "sales_window");
// { "data": { "sales_window": [{"rank": 1}, {"rank": 2}] } }