Error running query on database \"<database_host:port>\": pg_stat_statements pq: syntax error at or near \"e\"

What did you do?
We deployed postgres exporter version 0.11.1 using official helm chart, and we are noticing below error in the exporter pod logs:

ts=2023-02-06T14:06:40.385Z caller=namespace.go:236 level=info err="Error running query on database \"<database_host:port>\": pg_stat_statements pq: syntax error at or near \"e\""

ts=2023-02-06T14:06:40.385Z caller=namespace.go:193 level=debug msg="Querying namespace" namespace=pg_stat_database_conflicts

ts=2023-02-06T14:06:40.392Z caller=namespace.go:193 level=debug msg="Querying namespa

What did you expect to see?
We expect to see regular metrices for pg_stat_statements

What did you see instead? Under which circumstances?
We keep seeing the error listed above in the pod logs

Environment

• Kubernetes cluster v1.24+
• postgres_exporter version: 0.11.1
• postgres_exporter flags: None
• PostgreSQL version: 13.7

• Logs:

“ts=2023-02-06T14:06:40.385Z caller=namespace.go:236 level=info err="Error running query on database \"<database_host:port>\": pg_stat_statements pq: syntax error at or near \"e\""
ts=2023-02-06T14:06:40.385Z caller=namespace.go:193 level=debug msg="Querying namespace" namespace=pg_stat_database_conflicts
ts=2023-02-06T14:06:40.392Z caller=namespace.go:193 level=debug msg="Querying namespace" namespace=pg_replication
ts=2023-02-06T14:06:40.393Z caller=namespace.go:193 level=debug msg="Querying namespace" namespace=pg_stat_user_tables
ts=2023-02-06T14:06:40.448Z caller=collector.go:200 level=debug msg="collector succeeded" name=database duration_seconds=0.09150201
ts=2023-02-06T14:06:40.663Z caller=namespace.go:193 level=debug msg="Querying namespace" namespace=pg_statio_user_tables
ts=2023-02-06T14:06:40.664Z caller=namespace.go:236 level=info err="Error running query on database \"<database_host:port>\": pg_statio_user_tables pq: column \"toast_blks_re\" does not exist"
ts=2023-02-06T14:06:40.664Z caller=namespace.go:193 level=debug msg="Querying namespace" namespace=pg_database”

Reproduce the reported errors with postgres_exporter 0.11.1 and PostgreSQL 13.7, then inspect the query handling referenced at namespace.go:193 and namespace.go:236 for pg_stat_statements and pg_statio_user_tables. Done means those namespaces produce regular metrics without the reported syntax or missing-column errors.