from_constituent_tables

from_constituent_tables is a PartitionedTable method that creates a new PartitionedTable with a single column named __CONSTITUENT__, containing the provided constituent tables. The resultant partitioned table has no key columns, and its unique_keys and constituent_changes_permitted are False. It is a PartitionedTable class method, meaning it can be called on an instance of the class or the class itself.

Syntax

PartitionedTable.from_constituent_tables(
  tables: List[Table],
  constituent_table_columns: List[Column]
) -> PartitionedTable

Parameters

Parameter	Type	Description
tables	List[Table]	The constituent tables.
constituent_table_columns	List[Column]	A list of column definitions compatible with all the constituent tables. Default is `None`. When `constituent_table_columns` is not provided, it will be set to the column definitions of the first table in the provided constituent tables.

Returns

A PartitionedTable with a single column named __CONSTITUENT__, containing the provided constituent tables. The resulting PartitionedTable has no key columns, and both its unique_keys and constituent_changes_permitted properties are set to False.

Example

The following example uses from_constituent_tables to construct a partitioned table with no key columns.

from deephaven.table import PartitionedTable
from deephaven import empty_table

source1 = empty_table(5).update(["X = i", "Y = (i % 2 == 0) ? `A` : `B`"])
source2 = empty_table(5).update(["X = i + 2", "Y = (i % 3 == 1) ? `C` : `B`"])

pt = PartitionedTable.from_constituent_tables(tables=[source1, source2])
result = pt.table

Pydoc

from_constituent_tables

Syntax

Parameters

Returns

Example

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