vectorstores/duckdb: add DuckDB vectorstore implementation

examples/duckdb-vectorstore-example/duckdb_vectorstore_example.go

@@ -0,0 +1,123 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	"github.com/tmc/langchaingo/embeddings"
+	"github.com/tmc/langchaingo/llms/openai"
+	"github.com/tmc/langchaingo/schema"
+	"github.com/tmc/langchaingo/vectorstores"
+	duckdbstore "github.com/tmc/langchaingo/vectorstores/duckdb"
+)
+
+func main() {
+	// Create an embeddings client using the OpenAI API. Requires environment variable OPENAI_API_KEY to be set.
+	llm, err := openai.New()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	e, err := embeddings.NewEmbedder(llm)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Create a new DuckDB store. An empty connection URL creates an in-memory database.
+	ctx := context.Background()
+	store, err := duckdbstore.New(
+		ctx,
+		duckdbstore.WithConnectionURL(""),
+		duckdbstore.WithEmbedder(e),
+		duckdbstore.WithVectorDimensions(1536),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer store.Close()
+
+	// Add documents to the DuckDB store.
+	_, err = store.AddDocuments(ctx, []schema.Document{
+		{
+			PageContent: "Tokyo",
+			Metadata: map[string]any{
+				"population": 38,
+				"area":       2190,
+			},
+		},
+		{
+			PageContent: "Paris",
+			Metadata: map[string]any{
+				"population": 11,
+				"area":       105,
+			},
+		},
+		{
+			PageContent: "London",
+			Metadata: map[string]any{
+				"population": 9.5,
+				"area":       1572,
+			},
+		},
+		{
+			PageContent: "Santiago",
+			Metadata: map[string]any{
+				"population": 6.9,
+				"area":       641,
+			},
+		},
+		{
+			PageContent: "Buenos Aires",
+			Metadata: map[string]any{
+				"population": 15.5,
+				"area":       203,
+			},
+		},
+		{
+			PageContent: "Rio de Janeiro",
+			Metadata: map[string]any{
+				"population": 13.7,
+				"area":       1200,
+			},
+		},
+		{
+			PageContent: "Sao Paulo",
+			Metadata: map[string]any{
+				"population": 22.6,
+				"area":       1523,
+			},
+		},
+	})
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// Search for similar documents.
+	docs, err := store.SimilaritySearch(ctx, "japan", 1)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(docs)
+
+	// Search for similar documents using score threshold.
+	docs, err = store.SimilaritySearch(ctx, "only cities in south america", 10, vectorstores.WithScoreThreshold(0.80))
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(docs)
+
+	// Search for similar documents using score threshold and metadata filter.
+	// Note: json_extract_string converts numeric metadata values to strings.
+	filter := map[string]any{"area": 1523} // Sao Paulo
+
+	docs, err = store.SimilaritySearch(ctx, "only cities in south america",
+		10,
+		vectorstores.WithScoreThreshold(0.80),
+		vectorstores.WithFilters(filter),
+	)
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(docs)
+}

examples/duckdb-vectorstore-example/go.mod

@@ -0,0 +1,35 @@
+module github.com/tmc/langchaingo/examples/duckdb-vectorstore-example
+
+go 1.24.4
+
+require github.com/tmc/langchaingo v0.1.14-pre.4
+
+require (
+	github.com/apache/arrow-go/v18 v18.5.1 // indirect
+	github.com/dlclark/regexp2 v1.10.0 // indirect
+	github.com/duckdb/duckdb-go-bindings v0.3.3 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/darwin-amd64 v0.3.3 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/darwin-arm64 v0.3.3 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/linux-amd64 v0.3.3 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/linux-arm64 v0.3.3 // indirect
+	github.com/duckdb/duckdb-go-bindings/lib/windows-amd64 v0.3.3 // indirect
+	github.com/duckdb/duckdb-go/v2 v2.5.5 // indirect
+	github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
+	github.com/goccy/go-json v0.10.5 // indirect
+	github.com/google/flatbuffers v25.12.19+incompatible // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/klauspost/compress v1.18.3 // indirect
+	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
+	github.com/pierrec/lz4/v4 v4.1.25 // indirect
+	github.com/pkoukk/tiktoken-go v0.1.6 // indirect
+	github.com/zeebo/xxh3 v1.1.0 // indirect
+	golang.org/x/exp v0.0.0-20260112195511-716be5621a96 // indirect
+	golang.org/x/mod v0.32.0 // indirect
+	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/sys v0.40.0 // indirect
+	golang.org/x/telemetry v0.0.0-20260116145544-c6413dc483f5 // indirect
+	golang.org/x/tools v0.41.0 // indirect
+	golang.org/x/xerrors v0.0.0-20240903120638-7835f813f4da // indirect
+)
+
+replace github.com/tmc/langchaingo => ../..

examples/duckdb-vectorstore-example/go.sum

@@ -0,0 +1,125 @@
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