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Updated readme [skip ci]

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Andrew Kane
2024-09-28 12:07:09 -07:00
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README.md
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@@ -492,7 +492,7 @@ Specify the max number of probes
SET ivfflat.max_probes = 100; SET ivfflat.max_probes = 100;
``` ```
### Streaming Order ### Streaming Caveats
With streaming queries, it’s possible for rows to be slightly out of order by distance. For strict ordering, use: With streaming queries, it’s possible for rows to be slightly out of order by distance. For strict ordering, use:
@@ -502,6 +502,14 @@ WITH approx_order AS MATERIALIZED (
) SELECT * FROM approx_order ORDER BY distance; ) SELECT * FROM approx_order ORDER BY distance;
``` ```
Distance filters should be placed outside the CTE for best performance.
```sql
WITH approx_order AS MATERIALIZED (
SELECT *, embedding <-> '[1,2,3]' AS distance FROM items WHERE ... ORDER BY distance LIMIT 5
) SELECT * FROM approx_order WHERE distance < 0.1 ORDER BY distance;
```
## Half-Precision Vectors ## Half-Precision Vectors
*Added in 0.7.0* *Added in 0.7.0*