def METHOD_NAME(self, params: Dict) -> str:
    """
    MUST return the entire where clause, including the word "where"
    """
    where_vals = {
        'snowflake.ca_covid': {
            'open_data.case_demographics_age': "totalpositive < 120",
        }
    }
    db_cluster_key = _build_db_cluster_key(params)
    schema_tbl_key = f"{params.get('schema')}.{params.get('tableName')}"
    # Always returns a value, defaults to an empty string ('') if nothing is defined
    where_clause = where_vals.get(db_cluster_key, {}).get(schema_tbl_key, '')
    # Add the word where if a custom where clause is applied
    if where_clause:
        where_clause = f'WHERE {where_clause}'
    return where_clause