Class: Gitlab::Database::Aggregation::ClickHouse::Quantile

Inherits:
Column show all
Includes:
ParameterizedDefinition
Defined in:
lib/gitlab/database/aggregation/click_house/quantile.rb

Constant Summary collapse

DEFAULT_QUANTILE = 
0.5

Instance Attribute Summary

Attributes included from ParameterizedDefinition

#parameters

Attributes inherited from Column

#expression, #name, #secondary_expression, #type

Attributes inherited from PartDefinition

#description, #expression, #formatter, #name, #secondary_expression, #type

Instance Method Summary collapse

Methods included from ParameterizedDefinition

#instance_key

Methods inherited from Column

#secondary_arel, #to_inner_arel

Methods inherited from PartDefinition

#format_value, #instance_key, #validate_part

Constructor Details

#initialize(name, type = :float, expression = nil, **kwargs) ⇒ Quantile

Returns a new instance of Quantile.



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# File 'lib/gitlab/database/aggregation/click_house/quantile.rb', line 14

def initialize(name, type = :float, expression = nil, **kwargs)
  super
end

Instance Method Details

#identifier ⇒ Object 



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# File 'lib/gitlab/database/aggregation/click_house/quantile.rb', line 18

def identifier
  :"#{name}_quantile"
end

#to_outer_arel(context) ⇒ Object 



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# File 'lib/gitlab/database/aggregation/click_house/quantile.rb', line 22

def to_outer_arel(context)
  quantile = instance_parameter(:quantile, context[name]) || DEFAULT_QUANTILE

  inner_column = Arel::Table.new(context[:inner_query_name])[context.fetch(:local_alias, name)]

  Arel.sql("quantile(?)(?)", context[:scope].quote(quantile), inner_column)
end