Join BigQuery连接和填补空白

我有以下要合并的数据集，但我正在尝试填充空行

WITH data1 as (
  SELECT "2021-01-01" date, 'abc' company, 3 cumulative_count UNION ALL
  SELECT "2021-01-02" date, 'abc' company, 4 cumulative_count UNION ALL
  SELECT "2021-01-06" date, 'abc' company, 17 cumulative_count UNION ALL
  SELECT "2021-01-02" date , 'xzy' company, 2 cumulative_count UNION ALL
  SELECT "2021-01-04" date , 'xzy' company, 16 cumulative_count UNION ALL
  SELECT "2021-01-08" date , 'xzy' company, 16 cumulative_count
),

data_dates as (
    # SELECT * 
    # FROM UNNEST(GENERATE_DATE_ARRAY('2021-01-01', '2021-01-08',INTERVAL 1 DAY)) AS date
    SELECT "2021-01-01" date UNION ALL
    SELECT "2021-01-02" date UNION ALL
    SELECT "2021-01-03" date UNION ALL
    SELECT "2021-01-04" date UNION ALL
    SELECT "2021-01-05" date UNION ALL
    SELECT "2021-01-06" date UNION ALL
    SELECT "2021-01-07" date UNION ALL
    SELECT "2021-01-08" date
)

SELECT 
  a.date,
  b.company,
  b.cumulative_count
FROM data_dates as a
LEFT OUTER JOIN data1 as b
ON a.date = b.date

导致

我将如何从2021-01-02复制两家公司2021-01-03行的结果。基本上填充空行，直到新的更新值发挥作用。 另外，我将如何指定2021-01-01的xzy公司。 谢谢。

下面就可以了

WITH data1 as (
  SELECT "2021-01-01" date, 'abc' company, 3 cumulative_count UNION ALL
  SELECT "2021-01-02" date, 'abc' company, 4 cumulative_count UNION ALL
  SELECT "2021-01-06" date, 'abc' company, 17 cumulative_count UNION ALL
  SELECT "2021-01-02" date , 'xzy' company, 2 cumulative_count UNION ALL
  SELECT "2021-01-04" date , 'xzy' company, 16 cumulative_count UNION ALL
  SELECT "2021-01-08" date , 'xzy' company, 16 cumulative_count
), data_dates as (
    # SELECT * 
    # FROM UNNEST(GENERATE_DATE_ARRAY('2021-01-01', '2021-01-08',INTERVAL 1 DAY)) AS date
    SELECT "2021-01-01" date UNION ALL
    SELECT "2021-01-02" date UNION ALL
    SELECT "2021-01-03" date UNION ALL
    SELECT "2021-01-04" date UNION ALL
    SELECT "2021-01-05" date UNION ALL
    SELECT "2021-01-06" date UNION ALL
    SELECT "2021-01-07" date UNION ALL
    SELECT "2021-01-08" date
), data_companies as (
    SELECT DISTINCT company
    FROM data1
) 
SELECT 
  a.date,
  c.company,
  IFNULL(cumulative_count, LAST_VALUE(cumulative_count IGNORE NULLS) OVER(PARTITION BY c.company ORDER BY a.date)) cumulative_count      
FROM data_dates as a, data_companies as c
LEFT JOIN data1 as b
ON a.date = b.date 
AND c.company = b.company
ORDER BY date, company    

有输出