Sha256: 9760da94dd7ede25f0291719e7f2295e584997c22633befb9dda266dabb64d19
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Size: 719 Bytes
Versions: 20
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Stored size: 719 Bytes
Contents
module ActiveRecord
module ConnectionAdapters
class AbstractMysqlAdapter
def subquery_for(key, select)
subsubselect = select.clone
subsubselect.projections = [key]
# Materialize subquery by adding distinct
# to work with MySQL 5.7.6 which sets optimizer_switch='derived_merge=on'
subsubselect.distinct unless select.limit || select.offset || select.orders.any?
subselect = Arel::SelectManager.new(select.engine)
# CPK
#subselect.project Arel.sql(key.name)
subselect.project Arel.sql(Array(key).map(&:name).join(', '))
subselect.from subsubselect.as('__active_record_temp')
end
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems