如何在BigQuery中执行动态查询？

Question

我有以下查询：

WITH modalities as (
  SELECT DISTINCT
        col4 as modalities
  FROM `myproject.table1`

SELECT 
  CONCAT("""
      SELECT 
        col1,col2, col3
        """,
      STRING_AGG( if_clauses , """,
        """), 
      """
      FROM `myproject.table1`
      GROUP BY col1,col2, col3
      ORDER BY col1,col2
      """) as query
FROM 
  (
    SELECT 
      CONCAT ("SUM(IF (col4 = '",tcc, "',1,0)) as ", col4) as if_clauses
    FROM contact_type )

'''

基本上，它的作用是生成对一个热编码col4的查询：对于每种形式，我们都会生成一个新列。该查询返回一行带有一个字符串单元格的一行。

如何解释此查询？我正在搜索

之类的东西

With query as (...)
SELECT * FROM INTERPRET(QUERY)