instance method fetch_column_definitions

# File activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb, line 532
        def fetch_column_definitions(tables)
          structures = table_structures(tables)

          tables.index_with do |table|
            create_table_sql, structure = structure_for(structures, table)

            build_table_structure(structure, split_table_structure_sql(create_table_sql, structure.map { |column| column["name"] }))
          end
        end