import type { SqlValue, Row } from '@quereus/quereus';
/**
 * Comparator function for primary keys.
 * Returns negative if a < b, 0 if equal, positive if a > b.
 */
export type PKComparator = (a: SqlValue[], b: SqlValue[]) => number;
/**
 * Function to extract primary key from a row.
 */
export type PKExtractor = (row: Row) => SqlValue[];
/**
 * Comparator function for sort keys (may be PK, index key, or composite).
 * Returns negative if a < b, 0 if equal, positive if a > b.
 */
export type SortKeyComparator = (a: SqlValue[], b: SqlValue[]) => number;
/**
 * Function to extract sort key from a row.
 * For PK scans, this returns the PK.
 * For secondary index scans, this returns [indexKeyParts..., pkParts...].
 */
export type SortKeyExtractor = (row: Row) => SqlValue[];
/**
 * An entry in the overlay stream.
 * Can be a regular row (insert/update) or a tombstone (delete).
 */
export interface MergeEntry {
    /** The row data (for inserts/updates) or the PK values (for tombstones) */
    row: Row;
    /** If true, this entry represents a deletion */
    tombstone: boolean;
    /** Pre-extracted primary key for efficient comparison */
    pk: SqlValue[];
    /**
     * Pre-extracted sort key for merge ordering.
     * For PK scans, this equals pk.
     * For secondary index scans, this is [indexKeyParts..., pkParts...].
     */
    sortKey: SqlValue[];
}
/**
 * Configuration for the merge iterator.
 */
export interface MergeConfig {
    /** Compare two primary keys */
    comparePK: PKComparator;
    /** Extract primary key from an underlying row */
    extractPK: PKExtractor;
    /**
     * Compare two sort keys for merge ordering.
     * Defaults to comparePK if not provided.
     * For secondary index scans, compares by index key first, then PK.
     */
    compareSortKey?: SortKeyComparator;
    /**
     * Extract sort key from an underlying row.
     * Defaults to extractPK if not provided.
     * For secondary index scans, extracts [indexKeyParts..., pkParts...].
     */
    extractSortKey?: SortKeyExtractor;
}
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