def indexes(table_name, name = nil)
schemas = schema_search_path.split(/,/).map { |p| quote(p) }.join(',')
result = query("SELECT distinct i.relname, d.indisunique, d.indkey, t.oid\nFROM pg_class t, pg_class i, pg_index d\nWHERE i.relkind = 'i'\nAND d.indexrelid = i.oid\nAND d.indisprimary = 'f'\nAND t.oid = d.indrelid\nAND t.relname = '\#{table_name}'\nAND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname IN (\#{schemas}) )\nORDER BY i.relname\n", name)
result.map do |row|
index_name = row[0]
unique = row[1] == 't'
indkey = row[2].split(" ")
oid = row[3]
columns = Hash[query("SELECT a.attnum, a.attname\nFROM pg_attribute a\nWHERE a.attrelid = \#{oid}\nAND a.attnum IN (\#{indkey.join(\",\")})\n", "Columns for index #{row[0]} on #{table_name}")]
column_names = columns.values_at(*indkey).compact
column_names.empty? ? nil : IndexDefinition.new(table_name, index_name, unique, column_names)
end.compact
end