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# frozen_string_literal: true
module Gitlab
module BackgroundMigration
# Background migration to generically copy data from the given table into its corresponding partitioned table
class BackfillPartitionedTable < BatchedMigrationJob
operation_name :upsert_partitioned_table
feature_category :database
job_arguments :partitioned_table
def perform
validate_paritition_table!
bulk_copy = Gitlab::Database::PartitioningMigrationHelpers::BulkCopy.new(
batch_table,
partitioned_table,
batch_column,
connection: connection
)
each_sub_batch do |relation|
sub_start_id, sub_stop_id = relation.pick(Arel.sql("MIN(#{batch_column}), MAX(#{batch_column})"))
bulk_copy.copy_between(sub_start_id, sub_stop_id)
end
end
private
def validate_paritition_table!
unless connection.table_exists?(partitioned_table)
raise "exiting backfill migration because partitioned table #{partitioned_table} does not exist. " \
"This could be due to rollback of the migration which created the partitioned table."
end
# rubocop: disable Style/GuardClause
unless Gitlab::Database::PostgresPartitionedTable.find_by_name_in_current_schema(partitioned_table).present?
raise "exiting backfill migration because the given destination table is not partitioned."
end
# rubocop: enable Style/GuardClause
end
end
end
end
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