net.hydromatic.optiq

Interface Table

All Known Subinterfaces:

ModifiableTable, QueryableTable, TranslatableTable

All Known Implementing Classes:

AbstractQueryableTable, AbstractTable, MaterializedViewTable, StarTable, ViewTable

public interface Table

Table.

The typical way for a table to be created is when Calcite interrogates a user-defined schema in order to validate names appearing in a SQL query. Calcite finds the schema by calling Schema.getSubSchema(String) on the connection's root schema, then gets a table by calling Schema.getTable(String).

Note that a table does not know its name. It is in fact possible for a table to be used more than once, perhaps under multiple names or under multiple schemas. (Compare with the i-node concept in the UNIX filesystem.)

See Also:

TableMacro

Method Summary

Methods

Modifier and Type	Method and Description
Schema.TableType	getJdbcTableType() Type of table.
RelDataType	getRowType(RelDataTypeFactory typeFactory) Returns this table's row type.
Statistic	getStatistic() Returns a provider of statistics about this table.

Method Detail

getRowType

RelDataType getRowType(RelDataTypeFactory typeFactory)

Returns this table's row type.

This is a struct type whose fields describe the names and types of the columns in this table.

The implementer must use the type factory provided. This ensures that the type is converted into a canonical form; other equal types in the same query will use the same object.

Parameters:

typeFactory - Type factory with which to create the type

Returns:

Row type

getStatistic

Statistic getStatistic()

Returns a provider of statistics about this table.

getJdbcTableType

Schema.TableType getJdbcTableType()

Type of table.