org.apache.druid.sql.calcite.table

Class ExternalTable

java.lang.Object

org.apache.druid.sql.calcite.table.DruidTable

org.apache.druid.sql.calcite.table.ExternalTable

All Implemented Interfaces:

org.apache.calcite.schema.Table, org.apache.calcite.schema.TranslatableTable

public class ExternalTable
extends DruidTable

Represents an source of data external to Druid: a CSV file, an HTTP request, etc. Each such table represents one of Druid's DataSource types. Since SQL requires knowledge of the schema of that input source, the user must provide that information in SQL (via the `EXTERN` or up-coming `STAGED` function) or from the upcoming Druid Catalog.

Constructor Summary

Constructors

Constructor and Description
ExternalTable(DataSource dataSource, RowSignature rowSignature, com.fasterxml.jackson.databind.ObjectMapper objectMapper)

Method Summary

Modifier and Type	Method and Description
DataSource	getDataSource()
org.apache.calcite.rel.type.RelDataType	getRowType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)
boolean	isBroadcast()
boolean	isJoinable()
org.apache.calcite.rel.RelNode	toRel(org.apache.calcite.plan.RelOptTable.ToRelContext context, org.apache.calcite.plan.RelOptTable relOptTable)
String	toString()

Methods inherited from class org.apache.druid.sql.calcite.table.DruidTable

getJdbcTableType, getRowSignature, getStatistic, isRolledUp, rolledUpColumnValidInsideAgg

Methods inherited from class java.lang.Object

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

Constructor Detail

ExternalTable

public ExternalTable(DataSource dataSource,
                     RowSignature rowSignature,
                     com.fasterxml.jackson.databind.ObjectMapper objectMapper)

Method Detail

getDataSource

public DataSource getDataSource()

Specified by:

getDataSource in class DruidTable

isJoinable

public boolean isJoinable()

Specified by:

isJoinable in class DruidTable

isBroadcast

public boolean isBroadcast()

Specified by:

isBroadcast in class DruidTable

getRowType

public org.apache.calcite.rel.type.RelDataType getRowType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)

Specified by:

getRowType in interface org.apache.calcite.schema.Table

Overrides:

getRowType in class DruidTable

toRel

public org.apache.calcite.rel.RelNode toRel(org.apache.calcite.plan.RelOptTable.ToRelContext context,
                                            org.apache.calcite.plan.RelOptTable relOptTable)

toString

public String toString()

Overrides:

toString in class Object