presto-atop/src/main/java/io/prestosql/plugin/atop/AtopMetadata.java/AtopMetadata/listTableColumns
class AtopMetadata:    @Override
    public Map<SchemaTableName, List<ColumnMetadata>> listTableColumns(ConnectorSession session, SchemaTablePrefix prefix)
    {
        ImmutableMap.Builder<SchemaTableName, List<ColumnMetadata>> columns = ImmutableMap.builder();
        for (SchemaTableName tableName : listTables(session, prefix.getSchema())) {
            ConnectorTableMetadata tableMetadata = getTableMetadata(session, getTableHandle(session, tableName));
            columns.put(tableName, tableMetadata.getColumns());
        }
        return columns.build();
    }