Struct WindowFunctionPlanner 

pub struct WindowFunctionPlanner;

Window function plan generator

Implementations

impl WindowFunctionPlanner

pub fn plan( query: &Value, metadata: &FactTableMetadata, ) -> Result<WindowExecutionPlan>

Generate window function execution plan from JSON query

Example Query Format

{
  "table": "tf_sales",
  "select": ["revenue", "category"],
  "windows": [
    {
      "function": {"type": "row_number"},
      "alias": "rank",
      "partitionBy": ["data->>'category'"],
      "orderBy": [{"field": "revenue", "direction": "DESC"}]
    }
  ],
  "limit": 10
}

Errors

Returns FraiseQLError::Validation if the window function specification is invalid (e.g., missing required fields, disallowed characters, or unsupported function names).

pub fn validate( plan: &WindowExecutionPlan, _metadata: &FactTableMetadata, database_target: DatabaseType, ) -> Result<()>

Validate window function plan

Errors

Returns FraiseQLError::Validation if the plan uses features unsupported by the target database (e.g., RANGE frames on MySQL/SQLite).