WindowContext

Struct WindowContext 

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pub struct WindowContext { /* private fields */ }
Expand description

Context for evaluating window functions

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impl WindowContext

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pub fn new( view: Arc<DataView>, partition_by: Vec<String>, order_by: Vec<OrderByColumn>, ) -> Result<Self>

Create a new window context with partitioning and ordering

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pub fn new_with_spec(view: Arc<DataView>, spec: WindowSpec) -> Result<Self>

Create a new window context with a full window specification

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pub fn get_offset_value( &self, current_row: usize, offset: i32, column: &str, ) -> Option<DataValue>

Get value at offset from current row (for LAG/LEAD)

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pub fn get_row_number(&self, row_index: usize) -> usize

Get row number within partition (1-based)

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pub fn get_frame_first_value( &self, row_index: usize, column: &str, ) -> Option<DataValue>

Get first value in frame

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pub fn get_frame_last_value( &self, row_index: usize, column: &str, ) -> Option<DataValue>

Get last value in frame

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pub fn get_first_value( &self, row_index: usize, column: &str, ) -> Option<DataValue>

Get first value in partition

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pub fn get_last_value( &self, row_index: usize, column: &str, ) -> Option<DataValue>

Get last value in partition

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pub fn partition_count(&self) -> usize

Get the number of partitions

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pub fn has_partitions(&self) -> bool

Check if context has partitions (vs single window)

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pub fn has_frame(&self) -> bool

Check if context has a window frame specification

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pub fn source(&self) -> &DataTable

Get the source DataView

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pub fn get_frame_rows(&self, row_index: usize) -> Vec<usize>

Get row indices within the window frame for a given row

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pub fn get_frame_sum(&self, row_index: usize, column: &str) -> Option<DataValue>

Calculate sum of a column within the window frame for the given row

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pub fn get_frame_count( &self, row_index: usize, column: Option<&str>, ) -> Option<DataValue>

Calculate count within the window frame

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pub fn get_frame_avg(&self, row_index: usize, column: &str) -> Option<DataValue>

Calculate average of a column within the window frame

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pub fn get_frame_stddev( &self, row_index: usize, column: &str, ) -> Option<DataValue>

Calculate standard deviation within the window frame (sample stddev)

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pub fn get_frame_variance( &self, row_index: usize, column: &str, ) -> Option<DataValue>

Calculate variance within the window frame (sample variance with n-1)

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pub fn get_partition_sum( &self, row_index: usize, column: &str, ) -> Option<DataValue>

Calculate sum of a column over the partition containing the given row

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pub fn get_partition_count( &self, row_index: usize, column: Option<&str>, ) -> Option<DataValue>

Calculate count of non-null values in a column over the partition

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