org.apache.shardingsphere.sql.parser.relation.segment.select.projection

Interface Projection

All Known Implementing Classes:

AggregationDistinctProjection, AggregationProjection, ColumnProjection, DerivedProjection, ExpressionProjection, ShorthandProjection

public interface Projection

Projection interface.

Author:

zhangliang

Method Summary

Modifier and Type	Method and Description
com.google.common.base.Optional<String>	getAlias() Get alias.
String	getColumnLabel() Get columnLabel.
String	getExpression() Get expression.

Method Detail

getExpression

String getExpression()

Get expression.

Returns:

expression

getAlias

com.google.common.base.Optional<String> getAlias()

Get alias.

Returns:

alias

getColumnLabel

String getColumnLabel()

Get columnLabel.

Returns:

columnLabel