Snowflake cloud data platform 雪花，如何删除展平记录？

我无法使用以下语法删除我的记录：

DELETE FROM "DB_NAME"."SCHEMA_NAME"."TABLE_NAME",LATERAL FLATTEN(INPUT => src:Records) rec WHERE Records.value:requestParameters:key is null;

你能帮我解释一下好的语法吗？ 表源是一个变量表，如下所示：

{
"Records": [
  {
  "additionalEventData": {
    "AuthenticationMethod": "xxxxxxxxxxxxxx",
    "CipherSuite": "xxxxxxxxxxxxxxxxxx",
    "SignatureVersion": "xxxxxxxxxxxx",
    "bytesTransferredIn": xxxxxxxxxxxx,
    ...

尝试以下模式：

delete from table_name a
using table_name b, lateral flatten(input => b.src:Records, recursive=>true) c 
where a.src=b.src and c.key='key' and c.value::text is null

诀窍是使用带有自连接的USING子句。（递归选项不是必需的，只需相应地更新where子句即可。）