lancedb/docs/web/snippets/indexing.mdx

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export const PyFtsIndexAsync = "import asyncio\n\nimport lancedb\nimport polars as pl\nfrom lancedb.index import FTS\n\ndata = pl.DataFrame(\n    {\n        \"id\": [1, 2],\n        \"text\": [\n            \"His first language is spanish\",\n            \"Her first language is english\",\n        ],\n    }\n)\n\nasync def main(data: pl.DataFrame):\n    uri = \"ex_lancedb\"\n    db = await lancedb.connect_async(uri)\n    tbl = await db.create_table(\"my_text\", data=data, mode=\"overwrite\")\n\n    await tbl.create_index(\"text\", config=FTS(language=\"English\"))\n\n    response = await tbl.search(\"spanish\", query_type=\"fts\")\n    result = await response.limit(1).to_polars()\n    print(result)\n    return result\n\nif __name__ == \"__main__\":\n    asyncio.run(main(data))\n";

export const PyFtsIndexCreate = "table_name = \"fts-index-create\"\ntable = db.open_table(table_name)\ntable.create_fts_index(\"text\")\n";

export const PyFtsIndexNested = "from lancedb.query import MatchQuery, PhraseQuery\n\ntable = db.open_table(\"fts-index-nested\")\n\n# Index a text leaf inside a struct column using a dotted path.\ntable.create_fts_index(\"payload.text\", with_position=True)\n\n# The same dotted path works in MatchQuery and PhraseQuery.\nmatches = (\n    table.search(MatchQuery(\"puppy\", \"payload.text\")).limit(5).to_list()\n)\nphrases = (\n    table.search(PhraseQuery(\"puppy runs\", \"payload.text\"))\n    .limit(5)\n    .to_list()\n)\n";

export const PyFtsIndexWait = "table_name = \"fts-index-wait\"\n\ntable = db.open_table(table_name)\ntable.create_fts_index(\"text\")\n\nindex_name = \"text_idx\"\ntable.wait_for_index([index_name])\n";

export const PyGpuIndexCuda = "table.create_index(\n    num_partitions=256,\n    num_sub_vectors=96,\n    accelerator=\"cuda\",\n)\n";

export const PyGpuIndexMps = "table.create_index(\n    num_partitions=256,\n    num_sub_vectors=96,\n    accelerator=\"mps\",\n)\n";

export const PyReindexingIncremental = "table = db.open_table(\"reindexing_incremental\")\ntable.add([{\"vector\": [3.1, 4.1], \"text\": \"Frodo was a happy puppy\"}])\ntable.optimize()\n";

export const PyScalarIndexBuild = "tbl = db.open_table(\"scalar_index_build\")\ntbl.create_scalar_index(\"book_id\")\ntbl.create_scalar_index(\"publisher\", index_type=\"BITMAP\")\n";

export const PyScalarIndexFilter = "table = db.open_table(\"books\")\nresult = table.search().where(\"book_id = 2\").limit(10).to_pandas()\n";

export const PyScalarIndexNestedFields = "import pyarrow as pa\nfrom lancedb.index import BTree\n\nmetadata_type = pa.struct(\n    [\n        pa.field(\"user_id\", pa.int32()),\n        pa.field(\"user.id\", pa.int32()),\n    ]\n)\ndata = pa.Table.from_arrays(\n    [\n        pa.array([1, 2, 3], type=pa.int32()),\n        pa.array(\n            [\n                {\"user_id\": 10, \"user.id\": 100},\n                {\"user_id\": 20, \"user.id\": 200},\n                {\"user_id\": 30, \"user.id\": 300},\n            ],\n            type=metadata_type,\n        ),\n    ],\n    names=[\"user_id\", \"metadata\"],\n)\ntable = await db.create_table(\"nested_scalar_index\", data)\n\n# Index a nested struct field.\nawait table.create_index(\n    \"metadata.user_id\", config=BTree(), name=\"nested_user_id_idx\"\n)\n\n# Escape literal dots inside a segment with backticks.\nawait table.create_index(\n    \"metadata.`user.id`\", config=BTree(), name=\"escaped_user_id_idx\"\n)\n\n# `columns` is returned as the canonical path you passed in.\nfor index in await table.list_indices():\n    print(index.name, index.columns)\n# nested_user_id_idx  ['metadata.user_id']\n# escaped_user_id_idx ['metadata.`user.id`']\n";

export const PyScalarIndexOptimize = "table.add([{\"vector\": [7, 8], \"book_id\": 4}])\ntable.optimize()\n";

export const PyScalarIndexPrefilter = "table = db.open_table(\"book_with_embeddings\")\ntable.search([1.2] * 2).where(\"book_id != 3\").limit(10).to_pandas()\n";

export const PyScalarIndexUuidData = "def generate_random_names():\n    base_names = [\"Alice\", \"Bob\", \"Carla\", \"David\", \"Eve\", \"Frank\", \"Grace\"]\n    letter = random.choice(string.ascii_uppercase)\n    return f\"{random.choice(base_names)} {letter}.\"\n\ndef generate_uuids(num_items):\n    return [uuid.uuid4().bytes for _ in range(num_items)]\n\n# Generate some UUIDs and random names\nn = 7\nuuids = generate_uuids(n)\nnames = [generate_random_names() for _ in range(n)]\n";

export const PyScalarIndexUuidTable = "table_name = \"index-on-uuid\"\n\nuuid_array = pa.array(uuids, pa.uuid())\nname_array = pa.array(names, pa.string())\nschema = pa.schema(\n    [\n        pa.field(\"id\", pa.uuid()),\n        pa.field(\"name\", pa.string()),\n    ]\n)\ndata_table = pa.Table.from_arrays([uuid_array, name_array], schema=schema)\ntable = db.create_table(table_name, data=data_table, mode=\"overwrite\")\n";

export const PyScalarIndexUuidType = "import pyarrow as pa\n";

export const PyScalarIndexUuidUpsert = "new_users = [\n    {\"id\": uuid.uuid4().bytes, \"name\": \"Hannah D.\"},\n    {\"id\": uuid.uuid4().bytes, \"name\": \"Ian B.\"},\n]\n# Insert or update using the UUID index\ntable.merge_insert(\n    \"id\"\n).when_matched_update_all().when_not_matched_insert_all().execute(new_users)\n";

export const PyScalarIndexUuidWait = "index_name = \"id_idx\"\ntable.create_scalar_index(\"id\")\ntable.wait_for_index([index_name])\n";

export const PyScalarIndexWait = "index_name = \"label_idx\"\ntable.wait_for_index([index_name])\n";

export const PyVectorIndexAsyncConfig = "import lancedb\nimport numpy as np\nfrom lancedb.index import IvfPq\n\nasync def main():\n    data = [\n        {\"id\": i, \"vector\": np.random.random(8).astype(np.float32).tolist()}\n        for i in range(512)\n    ]\n\n    db = await lancedb.connect_async(\"ex_lancedb\")\n    table = await db.create_table(\n        \"vector_index_async\", data=data, mode=\"overwrite\"\n    )\n\n    await table.create_index(\n        \"vector\",\n        config=IvfPq(\n            distance_type=\"cosine\",\n            num_partitions=16,\n            num_sub_vectors=4,\n        ),\n    )\n    return await table.list_indices()\n";

export const PyVectorIndexBinaryAddData = "table.add(data)\n";

export const PyVectorIndexBinaryBuildIndex = "table.create_index(\n    metric=\"hamming\",\n    vector_column_name=\"vector\",\n    index_type=\"IVF_FLAT\",\n)\n";

export const PyVectorIndexBinarySchema = "table = tmp_db.create_table(table_name, schema=schema, mode=\"overwrite\")\n";

export const PyVectorIndexBinarySearch = "query = np.random.randint(0, 2, size=ndim)\nquery = np.packbits(query)\ndf = table.search(query).metric(\"hamming\").limit(10).to_pandas()\ndf.vector = df.vector.apply(np.unpackbits)\n";

export const PyVectorIndexBuildHnsw = "table.create_index(index_type=\"IVF_HNSW_SQ\")\n";

export const PyVectorIndexBuildIvf = "table_name = \"vector-index-build-ivf\"\ntable = db.open_table(table_name)\ntable.create_index(\n    metric=\"cosine\",\n    vector_column_name=\"keywords_embeddings\",\n)\n";

export const PyVectorIndexBypassRecall = "query = np.random.random(128)\nk = 10\n\n# Ground truth: flat (exhaustive) scan, ignoring the ANN index.\ntruth = set(table.search(query).bypass_vector_index().limit(k).to_pandas()[\"id\"])\n\n# ANN results with the current nprobes setting.\nann = set(table.search(query).nprobes(20).limit(k).to_pandas()[\"id\"])\n\nrecall_at_k = len(truth & ann) / k\n";

export const PyVectorIndexCheckStatus = "index_name = \"keywords_embeddings_idx\"\ntable.wait_for_index([index_name])\nprint(table.index_stats(index_name))\n";

export const PyVectorIndexConfigureIvf = "table.create_index(metric=\"l2\", num_partitions=16, num_sub_vectors=4)\n";

export const PyVectorIndexCustomName = "# Override the default `{column}_idx` convention by passing `name=...`.\ntable.create_index(\n    metric=\"cosine\",\n    vector_column_name=\"keywords_embeddings\",\n    name=\"my_custom_index\",\n)\ntable.wait_for_index([\"my_custom_index\"])\nprint(table.index_stats(\"my_custom_index\"))\n";

export const PyVectorIndexDistanceRange = "# Only return results whose distance falls within [0.0, 0.5).\n# Useful for near-duplicate detection or thresholded similarity search.\n(\n    table.search(np.random.random(128))\n    .distance_range(lower_bound=0.0, upper_bound=0.5)\n    .limit(10)\n    .to_pandas()\n)\n";

export const PyVectorIndexNestedField = "# The vector column `embedding` is nested inside the `image` struct.\n# Pass its full dotted path as `vector_column_name`; the same path is used\n# at query time and is what `list_indices()` reports under `columns`.\ntable.create_index(\n    vector_column_name=\"image.embedding\",\n    num_partitions=1,\n    num_sub_vectors=1,\n    name=\"image_embedding_idx\",\n)\n\nresults = (\n    table.search([0.0, 1.0], vector_column_name=\"image.embedding\")\n    .limit(1)\n    .to_list()\n)\n";

export const PyVectorIndexNprobes = "# Always scan 10 partitions; scan up to 50 only if the initial pass\n# returns fewer than `limit` results (common with narrow filters).\n(\n    table.search(np.random.random(128))\n    .minimum_nprobes(10)\n    .maximum_nprobes(50)\n    .where(\"id > 100\")\n    .limit(5)\n    .to_pandas()\n)\n";

export const PyVectorIndexQueryHnsw = "tbl = table\ntbl.search(np.random.random((16))).limit(2).to_pandas()\n";

export const PyVectorIndexQueryIvf = "tbl = table\ntbl.search(np.random.random((1536))).limit(2).nprobes(20).refine_factor(\n    10\n).to_pandas()\n";

export const PyVectorIndexSetup = "table_name = \"vector-index-tbl\"\ntable = db.open_table(table_name)\n";