langchain/docs/modules/indexes/document_loaders/examples/google_bigquery.ipynb

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   "source": [
    "# Google BigQuery\n",
    "\n",
    ">[Google BigQuery](https://cloud.google.com/bigquery) is a serverless and cost-effective enterprise data warehouse that works across clouds and scales with your data.\n",
    "`BigQuery` is a part of the `Google Cloud Platform`.\n",
    "\n",
    "Load a `BigQuery` query with one document per row."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "#!pip install google-cloud-bigquery"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "from langchain.document_loaders import BigQueryLoader"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "BASE_QUERY = '''\n",
    "SELECT\n",
    "  id,\n",
    "  dna_sequence,\n",
    "  organism\n",
    "FROM (\n",
    "  SELECT\n",
    "    ARRAY (\n",
    "    SELECT\n",
    "      AS STRUCT 1 AS id, \"ATTCGA\" AS dna_sequence, \"Lokiarchaeum sp. (strain GC14_75).\" AS organism\n",
    "    UNION ALL\n",
    "    SELECT\n",
    "      AS STRUCT 2 AS id, \"AGGCGA\" AS dna_sequence, \"Heimdallarchaeota archaeon (strain LC_2).\" AS organism\n",
    "    UNION ALL\n",
    "    SELECT\n",
    "      AS STRUCT 3 AS id, \"TCCGGA\" AS dna_sequence, \"Acidianus hospitalis (strain W1).\" AS organism) AS new_array),\n",
    "  UNNEST(new_array)\n",
    "'''"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Basic Usage"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 6,
   "metadata": {},
   "outputs": [],
   "source": [
    "loader = BigQueryLoader(BASE_QUERY)\n",
    "\n",
    "data = loader.load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 7,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[Document(page_content='id: 1\\ndna_sequence: ATTCGA\\norganism: Lokiarchaeum sp. (strain GC14_75).', lookup_str='', metadata={}, lookup_index=0), Document(page_content='id: 2\\ndna_sequence: AGGCGA\\norganism: Heimdallarchaeota archaeon (strain LC_2).', lookup_str='', metadata={}, lookup_index=0), Document(page_content='id: 3\\ndna_sequence: TCCGGA\\norganism: Acidianus hospitalis (strain W1).', lookup_str='', metadata={}, lookup_index=0)]\n"
     ]
    }
   ],
   "source": [
    "print(data)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Specifying Which Columns are Content vs Metadata"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 8,
   "metadata": {},
   "outputs": [],
   "source": [
    "loader = BigQueryLoader(BASE_QUERY, page_content_columns=[\"dna_sequence\", \"organism\"], metadata_columns=[\"id\"])\n",
    "\n",
    "data = loader.load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[Document(page_content='dna_sequence: ATTCGA\\norganism: Lokiarchaeum sp. (strain GC14_75).', lookup_str='', metadata={'id': 1}, lookup_index=0), Document(page_content='dna_sequence: AGGCGA\\norganism: Heimdallarchaeota archaeon (strain LC_2).', lookup_str='', metadata={'id': 2}, lookup_index=0), Document(page_content='dna_sequence: TCCGGA\\norganism: Acidianus hospitalis (strain W1).', lookup_str='', metadata={'id': 3}, lookup_index=0)]\n"
     ]
    }
   ],
   "source": [
    "print(data)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Adding Source to Metadata"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 18,
   "metadata": {},
   "outputs": [],
   "source": [
    "# Note that the `id` column is being returned twice, with one instance aliased as `source`\n",
    "ALIASED_QUERY = '''\n",
    "SELECT\n",
    "  id,\n",
    "  dna_sequence,\n",
    "  organism,\n",
    "  id as source\n",
    "FROM (\n",
    "  SELECT\n",
    "    ARRAY (\n",
    "    SELECT\n",
    "      AS STRUCT 1 AS id, \"ATTCGA\" AS dna_sequence, \"Lokiarchaeum sp. (strain GC14_75).\" AS organism\n",
    "    UNION ALL\n",
    "    SELECT\n",
    "      AS STRUCT 2 AS id, \"AGGCGA\" AS dna_sequence, \"Heimdallarchaeota archaeon (strain LC_2).\" AS organism\n",
    "    UNION ALL\n",
    "    SELECT\n",
    "      AS STRUCT 3 AS id, \"TCCGGA\" AS dna_sequence, \"Acidianus hospitalis (strain W1).\" AS organism) AS new_array),\n",
    "  UNNEST(new_array)\n",
    "'''"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 19,
   "metadata": {},
   "outputs": [],
   "source": [
    "loader = BigQueryLoader(ALIASED_QUERY, metadata_columns=[\"source\"])\n",
    "\n",
    "data = loader.load()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 20,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "[Document(page_content='id: 1\\ndna_sequence: ATTCGA\\norganism: Lokiarchaeum sp. (strain GC14_75).\\nsource: 1', lookup_str='', metadata={'source': 1}, lookup_index=0), Document(page_content='id: 2\\ndna_sequence: AGGCGA\\norganism: Heimdallarchaeota archaeon (strain LC_2).\\nsource: 2', lookup_str='', metadata={'source': 2}, lookup_index=0), Document(page_content='id: 3\\ndna_sequence: TCCGGA\\norganism: Acidianus hospitalis (strain W1).\\nsource: 3', lookup_str='', metadata={'source': 3}, lookup_index=0)]\n"
     ]
    }
   ],
   "source": [
    "print(data)"
   ]
  }
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