Linkis内置时间变量介绍

1.总述

需求背景

用户希望在写代码时，对时间的格式要求千变万化,已有的Linkis自定义变量目前还不足以支撑这些需求。另外,已有的时间运算-1有些表示减一个月,有些则是减一天,用户很容易混淆

目标

• 其他日期内置变量都是相对run_date计算出来
• 支持Pattern格式时间且用户可以自行随意指定
• 支持±y/±M/±d/±H等等

Pattern格式对照表:

Letter	Date or Time Component	Presentation	Examples
G	Era designator	Text	AD
y	Year	Year	1996; 96
Y	Week year	Year	2009; 09
M	Month in year	Month	July; Jul; 07
w	Week in year	Number	27
W	Week in month	Number	2
D	Day in year	Number	189
d	Day in month	Number	10
F	Day of week in month	Number	2
E	Day name in week	Text	Tuesday; Tue
e	Day number of week (1 = Monday, …, 7 = Sunday)	Number	1
a	Am/pm marker	Text	PM
H	Hour in day (0-23)	Number	0
k	Hour in day (1-24)	Number	24
K	Hour in am/pm (0-11)	Number	0
h	Hour in am/pm (1-12)	Number	12
m	Minute in hour	Number	30
s	Second in minute	Number	55
S	Millisecond	Number	978
z	Time zone	General time zone	Pacific Standard Time; PST; GMT-08:00
Z	Time zone	RFC 822 time zone	-0800
X	Time zone	ISO 8601 time zone	-08; -0800; -08:00

2. 总体设计

总体设计和技术架构参照Linkis自定义变量

3. 功能介绍

• Linkis支持的变量类型分为自定义变量(不做赘述)和系统内置变量，自定变量日期支持+-。
• 其中+-是先对linkis内置参数run_date进行运算,然后将%之前的pattern字段进行替换,非Pattern字符不支持运算替换。

3.1 内置变量举例

可以根据自己的喜好/业务实际情况定义需要动态渲染的参数

variable	result
&{yyyy-01-01}	2021-01-01
&{yyyy-01-01%-2y}	2019-01-01
&{yyyy-MM-01%-2M}	2021-02-01
&{yyyy-MM-dd%-2d}	2021-03-31
&{yyyy MM ----- HH%-1H}	2021 04 ----- 14
&{yyyyMMdd%-1d}	20210401
&{yyyyMM01%-1M}	20210301
&{HH%-1H}	14

3.2 自定义变量使用实例

• 例子1: sql

SELECT * FROM hive.tmp.fund_nav_histories
WHERE dt <= DATE_FORMAT(DATE_ADD('day', -1, DATE(Date_parse('&{yyyyMMdd%-1d}', '%Y%m%d'))), '%Y%m%d')

渲染后

SELECT * FROM hive.tmp.fund_nav_histories
WHERE dt <= DATE_FORMAT(DATE_ADD('day', -1, DATE(Date_parse('20220705', '%Y%m%d'))), '%Y%m%d')

• 例子2: shell

aws s3 ls  s3://***/ads/tmp/dws_member_active_detail_d_20210601_20211231/pt=&{yyyyMMdd%-1d}/

渲染后

aws s3 ls  s3://***/ads/tmp/dws_member_active_detail_d_20210601_20211231/pt=20220705/

• 例子3: datax json

{
  "job": {
    "setting": {
      "speed": {
        "channel": 1
      }
    },
    "content": [
      {
        "reader": {
          "name": "s3reader",
          "parameter": {
            "bucket": "**************",
            "path": [
              "ads/tmp/ccass_tm_announcements/&{yyyyMMdd%-1d}/"
            ],
            "stored": "parquet",
            "compression": "NONE",
            "column": [
              {
                "index": 0,
                "type": "int"
              },
              {
                "index": 1,
                "type": "string",
                "constant": "&{yyyyMMdd%-1d}"
              }
            ]
          }
        },
        "writer": {
          "name": "streamwriter",
          "parameter": {
            "print": true
          }
        }
      }
    ]
  }
}

渲染后

{
  "job": {
    "setting": {
      "speed": {
        "channel": 1
      }
    },
    "content": [
      {
        "reader": {
          "name": "s3reader",
          "parameter": {
            "bucket": "**************",
            "path": [
              "ads/tmp/ccass_tm_announcements/20220705/"
            ],
            "stored": "parquet",
            "compression": "NONE",
            "column": [
              {
                "index": 0,
                "type": "int"
              },
              {
                "index": 1,
                "type": "string",
                "constant": "20220705"
              }
            ]
          }
        },
        "writer": {
          "name": "streamwriter",
          "parameter": {
            "print": true
          }
        }
      }
    ]
  }
}

• 例子4:python

print(&{yyyyMMdd%-1d})

渲染后

 20220705