54 lines
1.7 KiB
Ruby
54 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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module PartitioningHelpers
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def expect_table_partitioned_by(table, columns, part_type: :range)
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columns_with_part_type = columns.map { |c| [part_type.to_s, c] }
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actual_columns = find_partitioned_columns(table)
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expect(columns_with_part_type).to match_array(actual_columns)
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end
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def expect_range_partition_of(partition_name, table_name, min_value, max_value)
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definition = find_partition_definition(partition_name)
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expect(definition).not_to be_nil
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expect(definition['base_table']).to eq(table_name.to_s)
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expect(definition['condition']).to eq("FOR VALUES FROM (#{min_value}) TO (#{max_value})")
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end
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private
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def find_partitioned_columns(table)
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connection.select_rows(<<~SQL)
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select
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case partstrat
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when 'l' then 'list'
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when 'r' then 'range'
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when 'h' then 'hash'
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end as partstrat,
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cols.column_name
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from (
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select partrelid, partstrat, unnest(partattrs) as col_pos
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from pg_partitioned_table
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) pg_part
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inner join pg_class
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on pg_part.partrelid = pg_class.oid
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inner join information_schema.columns cols
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on cols.table_name = pg_class.relname
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and cols.ordinal_position = pg_part.col_pos
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where pg_class.relname = '#{table}';
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SQL
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end
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def find_partition_definition(partition)
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connection.select_one(<<~SQL)
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select
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parent_class.relname as base_table,
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pg_get_expr(pg_class.relpartbound, inhrelid) as condition
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from pg_class
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inner join pg_inherits i on pg_class.oid = inhrelid
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inner join pg_class parent_class on parent_class.oid = inhparent
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where pg_class.relname = '#{partition}' and pg_class.relispartition;
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SQL
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end
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end
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