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Liquid

This document contains a collection of hypothetical liquid that would increase or simplify the use of liquid syntax in Looker.

Variables

While working on sorting by row totals when hitting the row limit with pivot I was looking for

`view_name.field_name._is_pivoted`

Whitespace Control

I would also love whitespace control to be enabled https://jinja.palletsprojects.com/en/3.0.x/templates/#whitespace-control.

Sets

While LookML already supports sets it wold be amazing if liquid syntax would allow to reference sets and allow a few operations on the same.

Set Definition

If the set was not already defined in LookML:

{% set field_list = [view_name.field_name_1, view_name.field_name_2] %}

The following predefined sets would be useful:

  • fields
  • dimensions
  • measures
  • filters
  • parameters

Set Operations

Given sets a and b the most needed and basic operations I can think of would be:

  • a|union(b)
  • a|intersect(b)
  • a|minus(b) or a|difference(b)
  • a|intersection(b)
  • a|contains(view_name.field_name)
  • a|size

Loops

Looping through sets of dimensions would allow to be much more flexible.

For example to dynamically bind filters in SQL derived tables:

WHERE 1=1
{% set exclude_dimensions = ['view_name.territory'] %}
{% for dimension in view_name.dimensions|minus(exclude_dimensions) %}
    {% if dimension._is_filtered %} AND {% condition dimension %} table_name.{% dimensions._field_name %} {% endcondition %} {% endif %}   
{% endfor %}

As the pseudocode in line 4 indicates, another set of field reference operations would become necessary.

Custom Aggregate Awareness

The above function would also allow simple custom aggregate awareness (demonstrated only for one path) like the follwoing:

view: view_a {

  # sql_table_name {

  sql_table_name:
    {% set rollup_1_fields = [view_a.a, view_a.b, view_a.c, view_a.d] %}
    {% set rollup_2_fields = [view_a.a, view_a.b, view_a.c, view_a.d, view_a.e, view_a.f] %}
    {% if rollup_1_fields|minus(fields)|size == 0 %}
      `rollup_1`
    {% elsif rollup_2_fields|minus(fields)|size == 0 %}
      `rollup_2`
    {% else %}
      `base_table`
    {% endif %} ;;
    
  # sql_table_name }
...
}

Field Reference Operations

Given that sets of field references contain full references to the fields, receiving the field name and view name from a field reference would be handy:

field_reference._field_name
field_reference._view_name

or if its not an attribute but an operator

field_reference|field_name
field_reference|view_name