org.apache.calcite.schema

Interface ExtensibleTable

All Superinterfaces:

Table

public interface ExtensibleTable
extends Table

Table whose row type can be extended to include extra fields.

In some storage systems, especially those with "late schema", there may exist columns that have values in the table but which are not declared in the table schema. However, a particular query may wish to reference these columns as if they were defined in the schema. Calling the extend(java.util.List<org.apache.calcite.rel.type.RelDataTypeField>) method creates a temporarily extended table schema.

If the table implements extended interfaces such as ScannableTable, FilterableTable or ProjectableFilterableTable, you may wish to make the table returned from extend(java.util.List<org.apache.calcite.rel.type.RelDataTypeField>) implement these interfaces as well.

Method Summary

Methods

Modifier and Type	Method and Description
Table	extend(List<RelDataTypeField> fields) Returns a table that has the row type of this table plus the given fields.

Methods inherited from interface org.apache.calcite.schema.Table

getJdbcTableType, getRowType, getStatistic

Method Detail

extend

Table extend(List<RelDataTypeField> fields)

Returns a table that has the row type of this table plus the given fields.