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JSONCompactStringsEachRowWithProgress

输入输出别名
✗✔

Description​

类似于 JSONCompactEachRowWithProgress，但所有值都会被转换为字符串。 当需要对所有数据类型进行统一的字符串表示时，此格式非常有用。

关键特性：

  • 结构与 JSONCompactEachRowWithProgress 相同
  • 所有值都表示为字符串（数字、数组等均以加引号的字符串形式输出）
  • 包含进度更新、汇总以及异常处理
  • 适用于偏好或要求基于字符串数据的客户端

使用示例​

插入数据​

SELECT *
FROM generateRandom('a Array(Int8), d Decimal32(4), c Tuple(DateTime64(3), UUID)', 1, 10, 2)
LIMIT 5
FORMAT JSONCompactStringsEachRowWithProgress

{"meta":[{"name":"a","type":"Array(Int8)"},{"name":"d","type":"Decimal(9, 4)"},{"name":"c","type":"Tuple(DateTime64(3), UUID)"}]}
{"row":["[-8]", "46848.5225", "('2064-06-11 14:00:36.578','b06f4fa1-22ff-f84f-a1b7-a5807d983ae6')"]}
{"row":["[-76]", "-85331.598", "('2038-06-16 04:10:27.271','2bb0de60-3a2c-ffc0-d7a7-a5c88ed8177c')"]}
{"row":["[-32]", "-31470.8994", "('2027-07-18 16:58:34.654','1cdbae4c-ceb2-1337-b954-b175f5efbef8')"]}
{"row":["[-116]", "32104.097", "('1979-04-27 21:51:53.321','66903704-3c83-8f8a-648a-da4ac1ffa9fc')"]}
{"row":["[]", "2427.6614", "('1980-04-24 11:30:35.487','fee19be8-0f46-149b-ed98-43e7455ce2b2')"]}
{"progress":{"read_rows":"5","read_bytes":"184","total_rows_to_read":"5","elapsed_ns":"191151"}}
{"rows_before_limit_at_least":5}

格式设置​