Package com.exasol.adapter.request

Class PushDownRequest

java.lang.Object

com.exasol.adapter.request.AbstractAdapterRequest

com.exasol.adapter.request.PushDownRequest

All Implemented Interfaces:

AdapterRequest

public class PushDownRequest
extends AbstractAdapterRequest

This class represents a request that tells a Virtual Schema Adapter to push a SQL statement down to the external data source.

Constructor Summary

Constructors

Constructor	Description
PushDownRequest(SchemaMetadataInfo schemaMetadataInfo, SqlStatement select, List<TableMetadata> involvedTablesMetadata, List<DataType> selectListDataType)	Create a new request of type PushDownRequest.

Method Summary

Modifier and Type	Method	Description
String	executeWith(AdapterCallExecutor adapterCallExecutor, com.exasol.ExaMetadata metadata)	Execute an adapter call.
List<TableMetadata>	getInvolvedTablesMetadata()	Get the metadata for the tables involved in the pushdown operation
SqlStatement	getSelect()	Get the SELECT statement that should be pushed down to the external data source.
List<DataType>	getSelectListDataTypes()	Get the expected data types for the result set.

Methods inherited from class com.exasol.adapter.request.AbstractAdapterRequest

getSchemaMetadataInfo, getType, getVirtualSchemaName, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

PushDownRequest

public PushDownRequest(SchemaMetadataInfo schemaMetadataInfo,
                       SqlStatement select,
                       List<TableMetadata> involvedTablesMetadata,
                       List<DataType> selectListDataType)

Create a new request of type PushDownRequest.

Parameters:

schemaMetadataInfo - schema metadata

select - SQL statement to be pushed down to the external data source

involvedTablesMetadata - tables involved in the push-down request

selectListDataType - expected data types for the result set

Method Detail

getSelect

public SqlStatement getSelect()

Get the SELECT statement that should be pushed down to the external data source.

Returns:

SELECT statement

getInvolvedTablesMetadata

public List<TableMetadata> getInvolvedTablesMetadata()

Get the metadata for the tables involved in the pushdown operation

Returns:

metadata of involved tables

getSelectListDataTypes

public List<DataType> getSelectListDataTypes()

Get the expected data types for the result set.

Returns:

expected data types for the result set

executeWith

public String executeWith(AdapterCallExecutor adapterCallExecutor,
                          com.exasol.ExaMetadata metadata)
                   throws AdapterException

Description copied from interface: AdapterRequest

Execute an adapter call.

Parameters:

adapterCallExecutor - instance of AdapterCallExecutor

metadata - metadata for the context in which the adapter exists

Returns:

response in a JSON format

Throws:

AdapterException - if some problem occurs