Google bigquery 如何使用BigQuery在INT64和二进制字符串之间进行转换？

BigQuery问题跟踪器上有一个用于转换函数的函数，例如INT64和二进制字符串之间的函数。除了使用JavaScript UDF之外，还有其他解决方法吗？

是的，您可以使用SQL实现INT64和二进制字符串之间的转换，而不需要JavaScript。以下是一个例子：

CREATE TEMP FUNCTION ToBinary(x INT64) AS (
  (SELECT STRING_AGG(CAST(x >> bit & 0x1 AS STRING), '' ORDER BY bit DESC)
   FROM UNNEST(GENERATE_ARRAY(0, 63)) AS bit)
);

CREATE TEMP FUNCTION FromBinary(s STRING) AS (
  (SELECT SUM(CAST(c AS INT64) << (LENGTH(s) - 1 - bit))
   FROM UNNEST(SPLIT(s, '')) AS c WITH OFFSET bit)
);

SELECT x, ToBinary(x) AS binary, FromBinary(ToBinary(x)) AS roundtrip
FROM UNNEST([1, 123456, 9876543210, -1001]) AS x;

另外，这里有一种在INT64和十六进制字符串之间转换的方法：

---

八进制转换留给读者作为练习。

很好，您找到了解决方法！您可以在发布答案48小时后接受答案

+------------+------------------------------------------------------------------+------------+
|     x      |                              binary                              | roundtrip  |
+------------+------------------------------------------------------------------+------------+
|          1 | 0000000000000000000000000000000000000000000000000000000000000001 |          1 |
|     123456 | 0000000000000000000000000000000000000000000000011110001001000000 |     123456 |
| 9876543210 | 0000000000000000000000000000001001001100101100000001011011101010 | 9876543210 |
|      -1001 | 1111111111111111111111111111111111111111111111111111110000010111 |      -1001 |
+------------+------------------------------------------------------------------+------------+

CREATE TEMP FUNCTION ToHex(x INT64) AS (
  (SELECT STRING_AGG(FORMAT('%02x', x >> (byte * 8) & 0xff), '' ORDER BY byte DESC)
   FROM UNNEST(GENERATE_ARRAY(0, 7)) AS byte)
);

CREATE TEMP FUNCTION FromHex(s STRING) AS (
  (SELECT SUM(CAST(CONCAT('0x', SUBSTR(s, byte * 2 + 1, 2)) AS INT64) << ((LENGTH(s) - (byte + 1) * 2) * 4))
   FROM UNNEST(GENERATE_ARRAY(1, LENGTH(s) / 2)) WITH OFFSET byte)
);

SELECT x, ToHex(x) AS hex, FromHex(ToHex(x)) AS roundtrip
FROM UNNEST([1, 123456, 9876543210, -1001]) AS x;

+------------+------------------+------------+
|     x      |       hex        | roundtrip  |
+------------+------------------+------------+
|          1 | 0000000000000001 |          1 |
|     123456 | 000000000001e240 |     123456 |
| 9876543210 | 000000024cb016ea | 9876543210 |
|      -1001 | fffffffffffffc17 |      -1001 |
+------------+------------------+------------+