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# frozen_string_literal: true
module Gitlab
module Pagination
module Keyset
module InOperatorOptimization
class OrderByColumns
include Enumerable
# This class exposes collection methods for the order by columns
#
# Example: by modeling the `issues.created_at ASC, issues.id ASC` ORDER BY
# SQL clause, this class will receive two ColumnOrderDefinition objects
def initialize(columns, arel_table)
@columns = columns.map do |column|
OrderByColumnData.new(column, "order_by_columns_#{column.attribute_name}", arel_table)
end
end
def arel_columns
columns.map(&:column_for_projection)
end
def array_aggregated_columns
columns.map(&:array_aggregated_column)
end
def array_aggregated_column_names
columns.map(&:array_aggregated_column_name)
end
def original_column_names
columns.map(&:original_column_name)
end
def original_column_names_as_arel_string
columns.map { |c| Arel.sql(c.original_column_name) }
end
def original_column_names_as_tmp_tamble
temp_table = Arel::Table.new('record')
original_column_names.map { |c| temp_table[c] }
end
def cursor_values(table_name)
columns.each_with_object({}) do |column, hash|
hash[column.original_column_name] = Arel.sql("#{table_name}.#{column.array_aggregated_column_name}[position]")
end
end
def array_lookup_expressions_by_position(table_name)
columns.map do |column|
Arel.sql("#{table_name}.#{column.array_aggregated_column_name}[position]")
end
end
def replace_value_in_array_by_position_expressions
columns.map do |column|
name = "#{QueryBuilder::RECURSIVE_CTE_NAME}.#{column.array_aggregated_column_name}"
new_value = "next_cursor_values.#{column.original_column_name}"
"#{name}[:position_query.position-1]||#{new_value}||#{name}[position_query.position+1:]"
end
end
def each(&block)
columns.each(&block)
end
private
attr_reader :columns
end
end
end
end
end
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