import { DuckDBType } from '../../@duckdb/data-types';
import { DuckDBValue } from '../../@duckdb/data-values';
import { DuckDBRow } from './DuckDBRow.js';
/**
 * A two-dimensional table of data along with column metadata.
 *
 * May represent either a partial or full result set, or a batch of rows read from a result stream.
 * */
export declare abstract class DuckDBData {
    /**
     * Number of columns.
     *
     * May be zero until the first part of the result is read. Will not change after the initial read.
     */
    abstract get columnCount(): number;
    /**
     * Current number of rows.
     *
     * For a partial result set, this may change as more rows are read.
     * For a full result, or a batch, this will not change.
     */
    abstract get rowCount(): number;
    /**
     * Returns the name of column at the given index (starting at zero).
     *
     * Note that duplicate column names are possible.
     */
    abstract columnName(columnIndex: number): string;
    /**
     * Returns the type of the column at the given index (starting at zero).
     */
    abstract columnType(columnIndex: number): DuckDBType;
    /**
     * Returns the value for the given column and row. Both are zero-indexed.
     */
    abstract value(columnIndex: number, rowIndex: number): DuckDBValue;
    /**
     * Returns the single value, assuming exactly one column and row. Throws otherwise.
     */
    singleValue(): DuckDBValue;
    /**
     * Returns the column names as an array.
     */
    columnNames(): readonly string[];
    /**
     * Returns the column names as an array, deduplicated following DuckDB's "Auto-Increment Duplicate Column Names"
     * behavior.
     */
    deduplicatedColumnNames(): readonly string[];
    /**
     * Returns the data as an array of row objects, keyed by column names.
     *
     * The column names are deduplicated following DuckDB's "Auto-Increment Duplicate Column Names" behavior.
     */
    toRows(): readonly DuckDBRow[];
}