Enum ScanPlan 

pub enum ScanPlan {
    SeqScan {
        table: String,
        filter: Option<String>,
    },
    ParallelSeqScan {
        table: String,
        filter: Option<String>,
        workers: usize,
    },
    PkLookup {
        table: String,
        pk_column: String,
        pk_value: String,
    },
    IndexScan {
        table: String,
        index_name: String,
        column: String,
        condition: String,
    },
    MultiIndexScan {
        table: String,
        indexes: Vec<(String, String, String)>,
        operation: String,
    },
    CompositeIndexScan {
        table: String,
        index_name: String,
        columns: Vec<String>,
        conditions: Vec<String>,
    },
}

Describes the access method that will be used for a table scan

This is used by EXPLAIN to show users how their queries will be executed.

Variants

SeqScan

Sequential scan - reads all rows and applies filter in memory

Fields

table: String

filter: Option<String>

ParallelSeqScan

Parallel sequential scan - reads all rows and filters in parallel across workers

Fields

table: String

filter: Option<String>

workers: usize

PkLookup

Primary key lookup - O(1) direct access by primary key

Fields

table: String

pk_column: String

pk_value: String

IndexScan

Index scan - uses an index to find matching rows

Fields

table: String

index_name: String

column: String

condition: String

MultiIndexScan

Multi-index scan - uses multiple indexes with AND/OR operations

Fields

table: String

indexes: Vec<(String, String, String)>

operation: String

CompositeIndexScan

Composite index scan - uses a multi-column index

Fields

table: String

index_name: String

columns: Vec<String>

conditions: Vec<String>

Trait Implementations

impl Clone for ScanPlan

fn clone(&self) -> ScanPlan

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ScanPlan

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ScanPlan

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.