type ColumnSourceMetadata = {
    tableName: string;
    schemaName?: string;
    sourceColumnName: string;
};
export declare function extractSingleTableFromSql(sql: string): {
    tableName: string;
    schemaName?: string;
} | null;
export declare function isSimpleSelectQuery(sql: string): boolean;
export declare function extractColumnSourcesFromSql(sql: string): {
    [resultColumnName: string]: string;
} | null;
export declare function extractColumnMetadataFromSql(sql: string): {
    [resultColumnName: string]: ColumnSourceMetadata;
} | null;
export {};