doris 2.1.2并发导出数据到对象存储

背景

根据doris官网描述使用Select Into Outfile方式导出时，如果需要并发导出，只需要设置SET enable_parallel_outfile = true;即可
文档链接：Select Into Outfile

但是实际操作中，这样并不会生效，可能还需要在会话中额外设置其他参数来解决

正确的使用姿势

SET enable_parallel_outfile = true;
set enable_pipeline_engine = false;
SELECT * FROM  `tmpdb`.tmp_table 
INTO OUTFILE "s3:/bucket_name/doris_export/ods.db/table_name/file_name"
FORMAT AS ORC
PROPERTIES(
 "s3.endpoint" = "",
    "s3.region" = "",
    "s3.secret_key"="",
    "s3.access_key" = "",
  "file_suffix" = ".orc",
    "max_file_size" = "200MB",
  "delete_existing_files" = "true"
);