/**
 * Snowflake Semantic Views Provider.
 *
 * Introspects Snowflake's semantic views (CREATE SEMANTIC VIEW) to discover
 * metrics, dimensions, and relationships. Unlike file-based providers (dbt,
 * cubejs), this provider requires a live Snowflake connection.
 *
 * Because dql-core must not depend on dql-connectors, this provider accepts
 * a generic query executor function. The CLI / local-runtime injects the
 * actual Snowflake connector at runtime.
 *
 * Usage:
 *   const provider = new SnowflakeSemanticProvider(async (sql) => {
 *     return connector.execute(sql);
 *   });
 *   const layer = await provider.loadAsync(config, projectRoot);
 */
import { SemanticLayer } from '../semantic-layer.js';
import type { SemanticLayerProviderConfig } from './provider.js';
export interface SnowflakeQueryRow {
    [column: string]: unknown;
}
export interface SnowflakeQueryResult {
    rows: SnowflakeQueryRow[];
}
/** A function that executes a SQL query against Snowflake and returns rows. */
export type SnowflakeQueryExecutor = (sql: string) => Promise<SnowflakeQueryResult>;
export declare class SnowflakeSemanticProvider {
    private readonly executeQuery;
    readonly name = "snowflake";
    constructor(executeQuery: SnowflakeQueryExecutor);
    /**
     * Load semantic layer definitions from Snowflake semantic views.
     * This is async because it needs to query Snowflake metadata.
     * Uses a file cache (1-hour TTL) to avoid repeated introspection.
     */
    loadAsync(config: SemanticLayerProviderConfig, _projectRoot: string): Promise<SemanticLayer>;
    /**
     * Clear the cached introspection so the next load queries Snowflake fresh.
     */
    static clearCache(projectRoot: string): boolean;
    /**
     * Check if cache is present and fresh.
     */
    static isCached(projectRoot: string): {
        cached: boolean;
        age?: number;
    };
    private populateLayerFromCache;
    /**
     * Discover available semantic views in the Snowflake account.
     */
    private discoverSemanticViews;
    private discoverViaInformationSchema;
}
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