/**
 * ExplainPlanParser (v3.1)
 *
 * Adapter-aware normalizer for EXPLAIN output. SQLite/MySQL/PostgreSQL/MongoDB
 * have native parsers; the rest 11 adapters return a raw text passthrough
 * shape (so the LLM can still see the plan, even if we can't structure-diff it).
 * Redis / similar get 'unsupported'.
 */
export interface NormalizedPlanNode {
    /** Operation label (e.g. 'SCAN TABLE', 'INDEX RANGE SCAN', 'Seq Scan', 'FULL SCAN') */
    op: string;
    /** Target table or relation (when parseable) */
    table?: string;
    /** Index used (when applicable) */
    index?: string;
    /** Estimated rows (when present) */
    rows?: number;
    /** Cost estimate (when present) */
    cost?: number;
    /** Raw text of this row (preserved for LLM) */
    raw?: string;
    /** Nested child nodes (when plan is hierarchical) */
    children?: NormalizedPlanNode[];
}
export interface NormalizedPlan {
    /** Adapters we could parse into structured form */
    dbType: string;
    /** True when this adapter is fully supported; false → raw text mode */
    structured: boolean;
    /** Total estimated cost (when present) */
    totalCost?: number;
    /** Total estimated rows (when present) */
    totalRows?: number;
    /** Hierarchical plan nodes */
    nodes: NormalizedPlanNode[];
    /** Raw text passthrough (always populated for LLM context) */
    rawText: string;
}
export declare class ExplainPlanParser {
    /**
     * Normalize EXPLAIN output from a real adapter.
     * `dbType` matches ProfileManager's `profile.type` string.
     */
    static normalize(rawText: string, dbType: string): NormalizedPlan;
    /** Compute SHA-256 hash of normalized raw text (for query identity). */
    static hashNormalized(plan: NormalizedPlan): string;
}
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