96 lines
2.6 KiB
Ruby
96 lines
2.6 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module Partitioning
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class TimePartition
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include Comparable
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def self.from_sql(table, partition_name, definition)
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matches = definition.match(/FOR VALUES FROM \('?(?<from>.+)'?\) TO \('?(?<to>.+)'?\)/)
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raise ArgumentError, "Unknown partition definition: #{definition}" unless matches
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raise NotImplementedError, "Open-end time partitions with MAXVALUE are not supported yet" if matches[:to] == 'MAXVALUE'
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from = matches[:from] == 'MINVALUE' ? nil : matches[:from]
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to = matches[:to]
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new(table, from, to, partition_name: partition_name)
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end
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attr_reader :table, :from, :to
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def initialize(table, from, to, partition_name: nil)
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@table = table.to_s
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@from = date_or_nil(from)
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@to = date_or_nil(to)
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@partition_name = partition_name
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end
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def partition_name
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return @partition_name if @partition_name
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suffix = from&.strftime('%Y%m') || '000000'
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"#{table}_#{suffix}"
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end
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def to_sql
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from_sql = from ? conn.quote(from.strftime('%Y-%m-%d')) : 'MINVALUE'
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to_sql = conn.quote(to.strftime('%Y-%m-%d'))
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<<~SQL
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CREATE TABLE IF NOT EXISTS #{fully_qualified_partition}
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PARTITION OF #{conn.quote_table_name(table)}
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FOR VALUES FROM (#{from_sql}) TO (#{to_sql})
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SQL
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end
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def to_detach_sql
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<<~SQL
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ALTER TABLE #{conn.quote_table_name(table)}
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DETACH PARTITION #{fully_qualified_partition}
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SQL
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end
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def ==(other)
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table == other.table && partition_name == other.partition_name && from == other.from && to == other.to
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end
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alias_method :eql?, :==
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def hash
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[table, partition_name, from, to].hash
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end
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def <=>(other)
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return if table != other.table
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partition_name <=> other.partition_name
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end
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def holds_data?
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conn.execute("SELECT 1 FROM #{fully_qualified_partition} LIMIT 1").ntuples > 0
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end
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private
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def date_or_nil(obj)
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return unless obj
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return obj if obj.is_a?(Date)
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Date.parse(obj)
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end
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def fully_qualified_partition
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"%s.%s" % [conn.quote_table_name(Gitlab::Database::DYNAMIC_PARTITIONS_SCHEMA), conn.quote_table_name(partition_name)]
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end
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def conn
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@conn ||= Gitlab::Database::SharedModel.connection
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end
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end
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end
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end
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end
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