Package org.apache.calcite.adapter.file

Class CsvTranslatableTable

java.lang.Object

org.apache.calcite.schema.impl.AbstractTable

org.apache.calcite.adapter.file.CsvTable

org.apache.calcite.adapter.file.CsvTranslatableTable

All Implemented Interfaces:

QueryableTable, Table, TranslatableTable, Wrapper

public class CsvTranslatableTable
extends CsvTable
implements QueryableTable, TranslatableTable

Table based on a CSV file.

Copied from CsvTranslatableTable in demo CSV adapter, with more advanced features.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.adapter.file.CsvTable

CsvTable.Flavor

Field Summary

Fields inherited from class org.apache.calcite.adapter.file.CsvTable

protoRowType, source

Method Summary

Modifier and Type	Method	Description
<T> Queryable<T>	asQueryable(QueryProvider queryProvider, SchemaPlus schema, String tableName)	Converts this table into a Queryable.
Type	getElementType()	Returns the element type of the collection that will implement this table.
Expression	getExpression(SchemaPlus schema, String tableName, Class clazz)	Generates an expression with which this table can be referenced in generated code.
Enumerable<Object>	project(DataContext root, int[] fields)	Returns an enumerable over a given projection of the fields.
RelNode	toRel(RelOptTable.ToRelContext context, RelOptTable relOptTable)	Converts this table into a relational expression.
String	toString()

Methods inherited from class org.apache.calcite.adapter.file.CsvTable

getFieldTypes, getRowType, isStream

Methods inherited from class org.apache.calcite.schema.impl.AbstractTable

getJdbcTableType, getStatistic, isRolledUp, rolledUpColumnValidInsideAgg, unwrap

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

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

getJdbcTableType, getRowType, getStatistic, isRolledUp, rolledUpColumnValidInsideAgg

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

maybeUnwrap, unwrapOrThrow

Method Details

toString

public String toString()

Overrides:

toString in class Object

project

public Enumerable<Object> project(DataContext root,
 int[] fields)

Returns an enumerable over a given projection of the fields.

getExpression

public Expression getExpression(SchemaPlus schema,
 String tableName,
 Class clazz)

Description copied from interface: QueryableTable

Generates an expression with which this table can be referenced in generated code.

Specified by:

getExpression in interface QueryableTable

Parameters:

schema - Schema

tableName - Table name (unique within schema)

clazz - The desired collection class; for example Queryable.

getElementType

public Type getElementType()

Description copied from interface: QueryableTable

Returns the element type of the collection that will implement this table.

Specified by:

getElementType in interface QueryableTable

asQueryable

public <T> Queryable<T> asQueryable(QueryProvider queryProvider,
 SchemaPlus schema,
 String tableName)

Description copied from interface: QueryableTable

Converts this table into a Queryable.

Specified by:

asQueryable in interface QueryableTable

toRel

public RelNode toRel(RelOptTable.ToRelContext context,
 RelOptTable relOptTable)

Description copied from interface: TranslatableTable

Converts this table into a relational expression.

Specified by:

toRel in interface TranslatableTable