Hi @szymon_dybczak 

I tried to execute your example, but it failed with this error:

"[INVALID_SET_SYNTAX] Expected format is 'SET', 'SET key', or 'SET key=value'. If you want to include special characters in key, or include semicolon in value, please use backquotes, e.g., SET `key`=`value`. SQLSTATE: 42000".

Could the cluster setup be an issue? Below is the extract of the cluster's JSON:

    "spark_version": "15.4.x-scala2.12",
    "spark_conf": {
        "spark.databricks.delta.preview.enabled": "true",
        "spark.databricks.conda.condaMagic.enabled": "true",
        "spark.master": "local[*, 4]",
        "spark.databricks.driver.disableDefaultMavenCentralResolver": "true",
        "spark.databricks.driver.disableSparkPackagesResolver": "true",
        "spark.databricks.cluster.profile": "singleNode"
    },
    "node_type_id": "Standard_DS3_v2",
    "driver_node_type_id": "Standard_DS3_v2"

Thanks,

Stefan