BigQuery:如何通过DML创建整数分区表

Question

我试图了解整数分区表是如何工作的。然而，到目前为止，我还无法创建一个。

这个查询有什么问题：

#standardSQL
CREATE or Replace TABLE temp.test_int_partition
PARTITION BY RANGE_BUCKET(id, GENERATE_ARRAY(0,100))
OPTIONS(
description="test int partition"
) 
as 
WITH data as (
SELECT 12 as id, 'Alex' as name
UNION ALL 
SELECT 23 as id, 'Chimp' as name
)
SELECT *
from data

我得到这个错误：

Error: PARTITION BY expression must be DATE(<timestamp_column>), a DATE column, or RANGE_BUCKET(<int64_column>, GENERATE_ARRAY(<int64_value>, <int64_value>, <int64_value>))

Answer 1

问题是，尽管GENERATE_ARRAY被记录为GENERATE_ARRAY(start_expression, end_expression [, step_expression])，意味着step_expression是可选的，但对于RANGE_BUCKET，它是强制性的。

因此，以下操作将起作用：

#standardSQL
CREATE or Replace TABLE temp.test_int_partition
PARTITION BY RANGE_BUCKET(id, GENERATE_ARRAY(0,100,1))
OPTIONS(
description="test int partition"
) 
as 
WITH data as (
SELECT 12 as id, 'Alex' as name
UNION ALL 
SELECT 23 as id, 'Chimp' as name
)
SELECT *
from data