text: BigQuery is a part of the Google Cloud Platform.Load a BigQuery query with one document per row.#!pip install google-cloud-bigqueryfrom langchain.document_loaders import BigQueryLoaderBASE_QUERY = """SELECT  id,  dna_sequence,  organismFROM (  SELECT    ARRAY (    SELECT      AS STRUCT 1 AS id, "ATTCGA" AS dna_sequence, "Lokiarchaeum sp. (strain GC14_75)." AS organism    UNION ALL    SELECT      AS STRUCT 2 AS id, "AGGCGA" AS dna_sequence, "Heimdallarchaeota archaeon (strain LC_2)." AS organism    UNION ALL    SELECT      AS STRUCT 3 AS id, "TCCGGA" AS dna_sequence, "Acidianus hospitalis (strain W1)." AS organism) AS new_array),  UNNEST(new_array)"""Basic Usageâ€‹loader = BigQueryLoader(BASE_QUERY)data = loader.load()print(data)    [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)]Specifying Which Columns are Content vs Metadataâ€‹loader = BigQueryLoader(    BASE_QUERY,    page_content_columns=["dna_sequence",