[CMT8.4.1.1209]The reverse of index hasn't work

• Fix Build Number:

  3028

1 Do migration from online to online.
2 Goto step3, Choose one table which has index, change the index to reverse, unique.

Actual result:
CREATE UNIQUE INDEX "a_b_id" ON "a"("b")

The sql need as follows:
CREATE reverse UNIQUE INDEX "a_b_id" ON "a"("b")