indexes

# File activerecord/lib/active_record/connection_adapters/sqlite3/schema_statements.rb, line 8
        def indexes(table_name)
          exec_query("PRAGMA index_list(#{quote_table_name(table_name)})", "SCHEMA").map do |row|
            # Indexes SQLite creates implicitly for internal use start with "sqlite_".
            # See https://www.sqlite.org/fileformat2.html#intschema
            next if row["name"].starts_with?("sqlite_")

            index_sql = query_value(              SELECT sql              FROM sqlite_master              WHERE name = #{quote(row['name'])} AND type = 'index'              UNION ALL              SELECT sql              FROM sqlite_temp_master              WHERE name = #{quote(row['name'])} AND type = 'index', "SCHEMA")

            /\sWHERE\s+(?<where>.+)$/ =~ index_sql

            columns = exec_query("PRAGMA index_info(#{quote(row['name'])})", "SCHEMA").map do |col|
              col["name"]
            end

            # Add info on sort order for columns (only desc order is explicitly specified, asc is
            # the default)
            orders = {}
            if index_sql # index_sql can be null in case of primary key indexes
              index_sql.scan(/"(\w+)" DESC/).flatten.each { |order_column|
                orders[order_column] = :desc
              }
            end

            IndexDefinition.new(
              table_name,
              row["name"],
              row["unique"] != 0,
              columns,
              where: where,
              orders: orders
            )
          end.compact
        end