High Memory usage when using #rdbms:query

[thisIsAnil]

Description:
Apps consumes a lot of memory(RAM) which keeps increasing linearly with time(or events may be).
At start my siddhi app consumes ~320MB and after 5hrs and <120 events the RAM usage goes to >1GB.
After looking into monitoring dashboard it was found that queries with db call(#rdbms:query/cud) and aggregation function (window.timeBatch) consume lot of memory which increases exponentially. Also stream with #rdbms:query for which no event was arrived also consume same memory which keeps increasing.
Database used - Postgres
Events throughput - < 1 event/min.

I suspect the postgres connection is not closed every time a #rdbms:query is requested which leads to memory leak. I have 5 queries in the app where #rdbms:query is used.

Affected Product Version:
WSO2 SP 4.4.0.1 (docker)

OS, DB, other environment details and versions:
Tested in multiple environment with different RAM config upto 64GB and Linux and Mac OS.
DB - Postgres

Steps to reproduce:
Connect Postgres to wso2 and create an app which queries postgres using #query:rdbms.