BigQuery - 计算数组中有多少个单词相等

Question

我想计算一条路径（将在分隔符 / 处拆分）和 return 匹配的整数数组中有多少相似词。

输入数据类似于：

我想添加另一列 match_count，其中包含一个整数数组。例如：

要复制这种情况，这是我正在使用的查询：

CREATE TEMP FUNCTION HOW_MANY_MATCHES_IN_PATH(src_path ARRAY<STRING>, test_path ARRAY<STRING>) RETURNS ARRAY<INTEGER> AS (
    -- WHAT DO I PUT HERE?
);

SELECT
    *,
    HOW_MANY_MATCHES_IN_PATH(src_path, test_path) as dir_path_match_count
FROM (
    SELECT
        ARRAY_AGG(x) AS src_path,
        ARRAY_AGG(y) as test_path
    FROM
        UNNEST([
            'lib/client/core.js',
            'lib/server/core.js'
        ]) AS x, UNNEST([
            'test/server/core.js'
        ]) as y
)

我已经尝试在 HOW_MANY_MATCHES_IN_PATH 函数中使用 ARRAY 和 UNNEST，但我要么以错误结束，要么以包含 4 个项目的数组结束（在本例中）

Answer 1

考虑以下方法

create temp function how_many_matches_in_path(src_path string, test_path string) returns integer as (
  (select count(distinct src)
  from unnest(split(src_path, '/')) src,
  unnest(split(test_path, '/')) test
  where src = test) 
);
select *, 
  array( select how_many_matches_in_path(src, test)
    from t.src_path src with offset
    join t.test_path test with offset
    using(offset)
  ) dir_path_match_count
from your_table t

是否适用于您问题中的输入数据样本

with your_table as (
  select 
    ['lib/client/core.js', 'lib/server/core.js'] src_path,
    ['test/server/core.js', 'test/server/core.js'] test_path
)

输出是

BigQuery - 计算数组中有多少个单词相等

BigQuery - Count how many words in array are equal

sql

google-bigquery