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Dimension Groups

Dimension Groups are a particular type of dimension used for timeframes (referencing the same date column but having slices for it daily, weekly, monthly, etc), and for intervals (referencing the difference between two date columns and slicing it days between, weeks between, months between, etc).

Properties#

name: (Required) The name of the dimension group. If you reference this dimension group in the default_date property you will use this name. If you reference this dimension group elsewhere, in sets, other dimensions, etc you will use syntax as follows: name_timeframe. Like all names, it follows Zenlytic naming conventions

field_type: (Required) The field type of the field. For dimension groups this is always dimension_group.

type: (Required) The type of the field. For dimension groups this is one of time or duration.

label: The label of the dimension group is what shows up to the end users of your data model. If not specified it defaults to the name of the dimension group.

description: The description of the dimension group. This is shown in the UI and can help end users understand what the field represents. When this is set and the zoe_description property is not set, this will be shown to Zoë. Use this to provide context to Zoë on how to use the field correctly.

zoe_description: The description of the dimension group shown to Zoë. If not set, Zoë uses description instead. If set, this replaces description for Zoë only. End users will still see description in the UI. Use this to provide context to Zoë on how to use the field correctly.

group_label: The label of the view the field is put into in the left hand sidebar menu. If not specified it defaults to the name of the view the field is present in.

hidden: A true indicates that this field should be hidden in the user interface. If a field is hidden it can still be referenced in the data model, despite not appearing to end users as a selectable field. The default is false which shows the field in the UI.

sql: (Required, only for type = time) This is the SQL expression that generates the field value. It can be as simple as ${TABLE}.my_field_name which just references a column in the database table, or something more advanced that references previously defined fields, like case when ${channel} ilike '%owned' then 'Yes' else 'No' end.

required_access_grants: This is a list of access grant names that are required to access this field. The grant names are always an OR condition. For example, if you listed human_resources and executive under this parameter, users who qualified for human_resources, executive or both would be able to access this field. Note, if the user has access to the field but does NOT have access to the view the field is defined in, the user will not be able to see the field.

synonyms: This is a list of strings phrases or words that you want to act as synonyms for natural language search. For example, if your measure is named total_revenue you might have synonyms of ['total sales', 'income']. This works like a keyword search under the hood, to make fields with synonyms related to the question asked show up in context for Zoë.

timeframes: (Required, only for type = time) This property is only for dimension groups of type time. It's a list of values which you want to make available to the end user. The options are listed below.

intervals: (Required, only for type = duration) This property is only for dimension groups of type duration. It's a list of values which you want to make available to the end user. The options are listed below.

convert_tz: A yes (or true) indicates that you want the timezone to be converted, a no (or false) indicates you do not want to convert the timezone from the native timezone to the timezone you specified in your model.

datatype: This indicates the database type of the date column referenced by the dimension group. The options are timestamp, datetime and date. The default is timestamp.

sql_start: (Required, only for type = duration) This is the SQL expression that generates the field value for the start of the duration.

sql_end: (Required, only for type = duration) This is the SQL expression that generates the field value for the end of the duration.

extra: The extra property is like dbt meta property, and you can put whatever additional properties you want in here. For example, under this property you could add a property like this maintainer: "jane doe"

Examples#

This example shows several fields, the first of which is the table's primary key and the second of which is a dimension group for a date and the third of which is a duration dimension group. In the Zenlytic interface, you'll reference the dates defines in the second field like order_date, order_month, etc. You'll reference the third field like days_between_first_order_and_this_order, months_between_first_order_and_this_order, etc.

version: 1type: viewname: order_lines
sql_table_name: prod.order_linesdefault_date: orderrow_label: Order Line
fields:- name: order_line_id  field_type: dimension  type: string  sql: ${TABLE}.order_line_id  primary_key: yes  hidden: yes
- name: order  sql: ${TABLE}.order_at  field_type: dimension_group  type: time  timeframes:  - raw  - date  - week  - month  - quarter  - year  datatype: timestamp
- name: between_first_order_and_this_order  field_type: dimension_group  type: duration  sql_start: ${TABLE}.first_order_date  sql_end: ${order_raw}  intervals: [day, week, month, quarter]