/**
 * IndexAdvisor (v3.1)
 *
 * Heuristic rules mapping a {@link NormalizedPlan} → a list of
 * {@link IndexAdvice}. Currently 4 rules:
 *
 *  1. seq_scan: any SQLite/MySQL/PG node whose op matches /(SCAN|Seq|FULL)/i
 *     and reports rows > 1000 → suggest a single-column index on the
 *     table's first referenced column.
 *  2. large_estimate: any node with rows >= 50000 → 'high' impact on
 *     the most specific column we can infer.
 *  3. no_index_join: nested-loop join where inner side has no `index`
 *     → recommend index on join column.
 *  4. sort_no_index: SORT step on a table that has no `index` → recommend
 *     a covering index with ORDER BY columns.
 *
 * Output is conservative by design: missing obvious advice is acceptable,
 * but false positives are explicitly avoided (heuristic skips when uncertain).
 */
import type { NormalizedPlanNode } from './explain-parser.js';
export interface IndexAdvice {
    sql: string;
    table: string;
    columns: string[];
    impact: 'low' | 'medium' | 'high';
    reason: 'seq_scan' | 'large_estimate' | 'no_index_join' | 'sort_no_index';
    evidence?: NormalizedPlanNode[];
}
export declare class IndexAdvisor {
    /** Run all heuristics against the plan. Returns 0+ advice items. */
    static analyze(plan: import('./explain-parser.js').NormalizedPlan): IndexAdvice[];
}
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