Struct VectorSparseInvertedIndexMethodCursor 

pub struct VectorSparseInvertedIndexMethodCursor { /* private fields */ }

Implementations

impl VectorSparseInvertedIndexMethodCursor

pub fn new(configuration: IndexMethodConfiguration) -> Self

Trait Implementations

impl IndexMethodCursor for VectorSparseInvertedIndexMethodCursor

fn create( &mut self, connection: &Arc<Connection>, database_id: usize, ) -> Result<IOResult<()>>

create necessary components for index method (usually, this is a bunch of btree-s)

fn destroy( &mut self, connection: &Arc<Connection>, database_id: usize, ) -> Result<IOResult<()>>

destroy components created in the create(…) call for index method

fn open_read( &mut self, connection: &Arc<Connection>, database_id: usize, ) -> Result<IOResult<()>>

open necessary components for reading the index

fn open_write( &mut self, connection: &Arc<Connection>, database_id: usize, ) -> Result<IOResult<()>>

open necessary components for writing the index

fn insert(&mut self, values: &[Register]) -> Result<IOResult<()>>

handle insert action “values” argument contains registers with values for index columns followed by rowid Integer register (e.g. for “CREATE INDEX i ON t USING method (x, z)” insert(…) call will have 3 registers in values: [x, z, rowid])

fn delete(&mut self, values: &[Register]) -> Result<IOResult<()>>

handle delete action “values” argument contains registers with values for index columns followed by rowid Integer register (e.g. for “CREATE INDEX i ON t USING method (x, z)” insert(…) call will have 3 registers in values: [x, z, rowid])

fn query_start(&mut self, values: &[Register]) -> Result<IOResult<bool>>

initialize query to the index method first element of “values” slice is the Integer register which holds index of the chosen IndexMethodDefinition::patterns by query planner next arguments of the “values” slice are values from the original query expression captured by pattern

fn query_rowid(&mut self) -> Result<IOResult<Option<i64>>>

Return rowid of the original table row which corresponds to the current cursor row

fn query_column(&mut self, _: usize) -> Result<IOResult<Value>>

Return column with given idx (zero-based) from current row

fn query_next(&mut self) -> Result<IOResult<bool>>

Moves cursor to the next response row Returns false if query exhausted all rows

fn pre_commit(&mut self) -> Result<IOResult<()>>

Called before transaction commit to flush any pending writes. This ensures index method writes are persisted as part of the transaction.

fn optimize( &mut self, _connection: &Arc<Connection>, _database_id: usize, ) -> Result<IOResult<()>>

Optimize the index by merging segments or performing other maintenance.

fn estimate_cost( &self, pattern_idx: usize, base_table_rows: f64, ) -> Option<IndexMethodCostEstimate>

Estimate the cost of executing a query with the given pattern.