[YSQL] adding a unique constraint "USING INDEX" doesn't rename the index

[fizaaluthra]

Jira Link: DB-15621

Description

eg:

yugabyte=# CREATE TABLE x (t int);
yugabyte=# CREATE UNIQUE INDEX x_t ON x(t);
yugabyte=# ALTER TABLE x ADD CONSTRAINT x_t_unique UNIQUE USING INDEX x_t;
NOTICE:  ALTER TABLE / ADD CONSTRAINT USING INDEX will rename index "x_t" to "x_t_unique"

As per the notice, the pg relname for the index changes:

yugabyte=# SELECT COUNT(*) FROM pg_class WHERE relname='x_t';
 count 
-------
     0
(1 row)

yugabyte=# SELECT COUNT(*) FROM pg_class WHERE relname='x_t_unique';
 count 
-------
     1
(1 row)

But the rename isn't reflected on the DocDB schema for the index.

Issue Type

kind/bug

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