-- display from PLAN_TABLE
function display(table_name varchar2 default 'PLAN_TABLE', statement_id varchar2 default null, format varchar2 default 'TYPICAL', filter_preds varchar2 default null) return dbms_xplan_type_table pipelined;
-- display from V$SQL_PLAN (or V$SQL_PLAN_STATISTICS_ALL)
function display_cursor(sql_id varchar2 default null, cursor_child_no integer default 0, format varchar2 default 'TYPICAL') return dbms_xplan_type_table pipelined;
-- display from AWR dba_hist_sql_plan 6级以上用stats$sql_plan
function display_awr(sql_id varchar2, plan_hash_value integer default null, db_id integer default null, format varchar2 default 'TYPICAL') return dbms_xplan_type_table pipelined;
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