Google bigquery 查询Bigtable以从Bigquery扫描行键

使用BigQuery的Bigtable外部数据源，我想扫描Bigtable中的行键

这里是BigTable模式，它类似于官方文档的时间序列1

交易所+符号+日期，例如NASDAQZXZZT2020-02-01

我想知道如何查询2020-01-01到2020-02-01之间的所有数据

我试过这种方法，但不起作用。。。

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从blah.blah中选择rowkey，其中rowkey>=2020-01-01和rowkey我自己找到了查询。。。但不确定这是一个好问题还是一个坏问题

SELECT * FROM 
(SELECT
  (SELECT keys FROM UNNEST(SPLIT(rowkey, "|")) as keys WITH OFFSET AS offset WHERE offset = 0) as exchange,
  (SELECT keys FROM UNNEST(SPLIT(rowkey, "|")) as keys WITH OFFSET AS offset WHERE offset = 1) as symbol,
  (SELECT keys FROM UNNEST(SPLIT(rowkey, "|")) as keys WITH OFFSET AS offset WHERE offset = 2) as biz_date,
FROM
  `blah.blah`)
WHERE biz_date < '2020-01-01' AND ccy = 'SGD'