45 lines
1.3 KiB
Ruby
45 lines
1.3 KiB
Ruby
# frozen_string_literal: true
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class AddPartitionedTableView < ActiveRecord::Migration[6.0]
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DOWNTIME = false
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def up
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execute(<<~SQL)
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CREATE OR REPLACE VIEW postgres_partitioned_tables AS
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SELECT
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pg_namespace.nspname::text || '.'::text || pg_class.relname::text AS identifier,
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pg_class.oid AS oid,
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pg_namespace.nspname AS schema,
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pg_class.relname AS name,
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CASE partitioned_tables.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 strategy,
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array_agg(pg_attribute.attname) as key_columns
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FROM (
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SELECT
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partrelid,
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partstrat,
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unnest(partattrs) as column_position
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FROM pg_partitioned_table
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) partitioned_tables
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INNER JOIN pg_class
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ON partitioned_tables.partrelid = pg_class.oid
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INNER JOIN pg_namespace
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ON pg_class.relnamespace = pg_namespace.oid
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INNER JOIN pg_attribute
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ON pg_attribute.attrelid = pg_class.oid
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AND pg_attribute.attnum = partitioned_tables.column_position
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WHERE pg_namespace.nspname = current_schema()
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GROUP BY identifier, pg_class.oid, schema, name, strategy;
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SQL
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end
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def down
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execute(<<~SQL)
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DROP VIEW IF EXISTS postgres_partitioned_tables
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SQL
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end
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end
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