presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/CassandraMetadata.java/CassandraMetadata/listTableColumns
class CassandraMetadata:    @Override
    public Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(ConnectorSession session, SchemaTablePrefix prefix)
    {
        requireNonNull(prefix, "prefix is null");
        ImmutableMap.Builder<SchemaTableName, List<ColumnMetadata>> columns = ImmutableMap.builder();
        for (SchemaTableName tableName : listTables(session, prefix)) {
            try {
                columns.put(tableName, getTableMetadata(tableName).getColumns());
            }
            catch (NotFoundException e) {
                // table disappeared during listing operation
            }
        }
        return columns.build();
    }