ring_table
The ring_table method creates a ring table that retains the latest capacity number of rows from the parent table.
Latest rows are determined by the new rows added to the parent table. Deleted rows are ignored, and updated rows are not expected and will raise an exception.
Syntax
ring_table(parent: Table, capacity: int, initialize: bool = True) -> Table
Parameters
| Parameter | Type | Description |
|---|---|---|
| parent | Table | The parent table. |
| capacity | int | The capacity of the ring table. |
| initialize | bool | Whether to initialize the ring table with a snapshot of the parent table. Default is |
Returns
An in-memory ring table.
Examples
The following example creates a table with one column of three integer values.
from deephaven import new_table, ring_table
from deephaven.column import int_col
source = new_table([int_col("IntegerColumn", [1, 2, 3, 4, 5])])
result = ring_table(source, 3)
- source
- result