For all the dnodes in a TDengine cluster, the below parameters must be configured exactly the same, any node whose configuration is different from dnodes already in the cluster can't join the cluster.
For all the dnodes in a TDengine cluster, the below parameters must be configured exactly the same, any node whose configuration is different from dnodes already in the cluster can't join the cluster.
**Description**: The linear regression function of the specified column and the timestamp column (primary key), `start_val` is the initial value and `step_val` is the step value.
**Description**: The linear regression function of a specified column, `start_val` is the initial value and `step_val` is the step value.
**Return value type**: A string in the format of "(slope, intercept)"
**Return value type**: A string in the format of "(slope, intercept)"