OceanBase MATERIAL

obclient>CREATE TABLE t1(c1 INT, c2 INT, c3 INT);
Query OK, 0 rows affected (0.12 sec)

obclient>CREATE TABLE t2(c1 INT ,c2 INT ,c3 INT);
Query OK, 0 rows affected (0.12 sec)

obclient>EXPLAIN SELECT  /*+ORDERED USE_NL(T2)*/* FROM t1,t2 
         WHERE t1.c1=t2.c1\G;
*************************** 1. row ***************************
Query Plan: 
===========================================
|ID|OPERATOR        |NAME|EST. ROWS|COST  |
-------------------------------------------
|0 |NESTED-LOOP JOIN|    |2970     |277377|
|1 | TABLE SCAN     |t1  |3        |37    |
|2 | MATERIAL       |    |100000   |176342|
|3 |  TABLE SCAN    |t2  |100000   |70683 |
===========================================
Outputs & filters: 
-------------------------------------
  0 - output([t1.c1], [t1.c2], [t1.c3], [t2.c1], [t2.c2], [t2.c3]), filter(nil), 
      conds([t1.c1 = t2.c1]), nl_params_(nil)
  1 - output([t1.c1], [t1.c2], [t1.c3]), filter(nil), 
      access([t1.c1], [t1.c2], [t1.c3]), partitions(p0)
  2 - output([t2.c1], [t2.c2], [t2.c3]), filter(nil)
  3 - output([t2.c1], [t2.c2], [t2.c3]), filter(nil), 
      access([t2.c1], [t2.c2], [t2.c3]), partitions(p0)