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feat: add take_offsets and take_row_ids (#2584)

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These operations have existed in lance for a long while and many users
need to drop down to lance for this capability. This PR adds the API and
implements it using filters (e.g. `_rowid IN (...)`) so that in doesn't
currently add any load to `BaseTable`. I'm not sure that is sustainable
as base table implementations may want to specialize how they handle
this method. However, I figure it is a good starting point.

In addition, unlike Lance, this API does not currently guarantee
anything about the order of the take results. This is necessary for the
fallback filter approach to work (SQL filters cannot guarantee result
order)
This commit is contained in:
Weston Pace
2025-08-15 06:48:24 -07:00
committed by GitHub
parent 296205ef96
commit ed640a76d9
24 changed files with 1488 additions and 381 deletions
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23
nodejs/lancedb/table.ts
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@@ -35,6 +35,7 @@ import {
import {
FullTextQuery,
Query,
TakeQuery,
VectorQuery,
instanceOfFullTextQuery,
} from "./query";
@@ -336,6 +337,20 @@ export abstract class Table {
*/
abstract query(): Query;
/**
* Create a query that returns a subset of the rows in the table.
* @param offsets The offsets of the rows to return.
* @returns A builder that can be used to parameterize the query.
*/
abstract takeOffsets(offsets: number[]): TakeQuery;
/**
* Create a query that returns a subset of the rows in the table.
* @param rowIds The row ids of the rows to return.
* @returns A builder that can be used to parameterize the query.
*/
abstract takeRowIds(rowIds: number[]): TakeQuery;
/**
* Create a search query to find the nearest neighbors
* of the given query
@@ -665,6 +680,14 @@ export class LocalTable extends Table {
await this.inner.waitForIndex(indexNames, timeoutSeconds);
}
takeOffsets(offsets: number[]): TakeQuery {
return new TakeQuery(this.inner.takeOffsets(offsets));
}
takeRowIds(rowIds: number[]): TakeQuery {
return new TakeQuery(this.inner.takeRowIds(rowIds));
}
query(): Query {
return new Query(this.inner);
}