[YSQL] Batch nested loops closing connection when querying information_schema table due to invalid cumulative relations when getting batched clauses

[mislam-yb]

Jira Link: DB-5284

Description

When using batched nested loops, queries to information_schema cause the connection to close due to the following error seen on the postgres logs:

TRAP: FailedAssertion("!(!bms_overlap(cur_relgroup, cumulative_rels))", File: "../../../../../../../src/postgres/src/backend/optimizer/util/restrictinfo.c", Line: 519)

This error occured for the latest debug build for 2.17.2.0, and was reproduced by @tanujnay112.

Reproduction:

set yb_bnl_batch_size = 1;
select table_name, table_schema from information_schema.tables;
-- works fine

set yb_bnl_batch_size = 2;
select table_name, table_schema from information_schema.tables;
server closed the connection unexpectedly
        This probably means the server terminated abnormally
        before or while processing the request.
The connection to the server was lost. Attempting reset: Succeeded.