OceanBase Oracle企业版4.1执行计划支持索引快速全扫描吗，
下面这个SQL，oracle可以实现：
CREATE TABLE t1210_1 (c1 NUMBER not null,c2 NUMBER);
CREATE INDEX idx_c1_1210 ON t1210_1 (c1);
EXPLAIN PLAN FOR SELECT /+ index_ffs(t1210_1 idx_c1_1210)/ count(c1) FROM t1210_1 group by c1;;
SELECT * FROM table(DBMS_XPLAN.DISPLAY);
执行计划结果如下：
但是oceanbase oracle执行下面的sql：
CREATE TABLE t1210_1 (c1 NUMBER not null,c2 NUMBER);
CREATE INDEX idx_c1_1210 ON t1210_1 (c1);
explain SELECT count(c1) FROM t1210_1 group by c1;
执行计划结果如下：
|ID|OPERATOR |NAME |EST.ROWS|EST.TIME(us)|
|0 |MERGE GROUP BY| |1 |2 |
|1 | TABLE SCAN |T1210_1(IDX_C1_1210)|1 |2 |
Outputs & filters:
0 - output([T_FUN_COUNT(T1210_1.C1)]), filter(nil), rowset=256
group([T1210_1.C1]), agg_func([T_FUN_COUNT(T1210_1.C1)])
1 - output([T1210_1.C1]), filter(nil), rowset=256
access([T1210_1.C1]), partitions(p0)
is_index_back=false, is_global_index=false,
range_key([T1210_1.C1], [T1210_1.__pk_increment]), range(MIN,MIN ; MAX,MAX)always true
没有看到索引快速全扫描的标志，是oceanbase oracle4.1企业版不支持吗，官方文档没有找到相关说明，请知道的老师说明一下，谢谢！！！