feat: add list_indices to the async api (#1074)

nodejs/lancedb/native.d.ts

@@ -3,6 +3,18 @@
 
 /* auto-generated by NAPI-RS */
 
+/** A description of an index currently configured on a column */
+export interface IndexConfig {
+  /** The type of the index */
+  indexType: string
+  /**
+   * The columns in the index
+   *
+   * Currently this is always an array of size 1.  In the future there may
+   * be more columns to represent composite indices.
+   */
+  columns: Array<string>
+}
 /**
  *  A definition of a column alteration. The alteration changes the column at
  * `path` to have the new name `name`, to be nullable if `nullable` is true,
@@ -122,4 +134,5 @@ export class Table {
   checkout(version: number): Promise<void>
   checkoutLatest(): Promise<void>
   restore(): Promise<void>
+  listIndices(): Promise<Array<IndexConfig>>
 }

nodejs/lancedb/table.ts

@@ -16,12 +16,14 @@ import { Schema, tableFromIPC } from "apache-arrow";
 import {
   AddColumnsSql,
   ColumnAlteration,
+  IndexConfig,
   Table as _NativeTable,
 } from "./native";
 import { Query } from "./query";
 import { IndexOptions } from "./indices";
 import { Data, fromDataToBuffer } from "./arrow";
 
+export { IndexConfig } from "./native";
 /**
  * Options for adding data to a table.
  */
@@ -342,4 +344,11 @@ export class Table {
   async restore(): Promise<void> {
     await this.inner.restore();
   }
+
+  /**
+   * List all indices that have been created with Self::create_index
+   */
+  async listIndices(): Promise<IndexConfig[]> {
+    return await this.inner.listIndices();
+  }
 }