`keepReplica` doesn’t seem to do anything

[MatTheCat]

Bug Report

Q	A
Version	4.4.3
Previous Version if the bug is a regression	N/A

Summary

The only documentation I could find regarding keepReplica is from https://symfony.com/doc/current/doctrine/dbal.html#using-primary-replica-connections-read-replicas:

Set the keep_replica option to true to keep using the replica for read queries even after a write operation.

Current behavior

Setting keep_replica to true, the connection still uses the primary for a read query after writes.

Expected behavior

Given the documentation, I was expecting the replica to be used instead.

How to reproduce

1. Configure a connection with replicas and keep_replica to true.
2. Run some write queries to connect to the primary
3. Run a read query

Is calling PrimaryReadReplicaConnection::ensureConnectedToReplica() mandatory for this feature to work? If yes that would be a documentation issue.

Or should PrimaryReadReplicaConnection override executeQuery to call it itself?