The warning indicates that the client cache (used to manage connections between your local environment and the Databricks cluster) has reached its maximum size (20 sessions). When this limit is reached, the oldest session is closed to make room for a...
.option(nullValue, "")empty strings are interpreted as null values by default. If you set nullValue to anything but "", like "null" or "none", empty strings will be read as empty strings and not as null values anymore.Please check-dataframe - Read sp...
