org.apache.calcite.sql2rel

Class SqlToRelConverter.NoOpSubQueryConverter

java.lang.Object

org.apache.calcite.sql2rel.SqlToRelConverter.NoOpSubQueryConverter

All Implemented Interfaces:

SubQueryConverter

Enclosing class:

SqlToRelConverter

private class SqlToRelConverter.NoOpSubQueryConverter
extends Object
implements SubQueryConverter

A default implementation of SubQueryConverter that does no conversion.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	NoOpSubQueryConverter()

Method Summary

Modifier and Type	Method and Description
boolean	canConvertSubQuery()
RexNode	convertSubQuery(SqlCall subQuery, SqlToRelConverter parentConverter, boolean isExists, boolean isExplain) Converts the sub-query to an equivalent expression.

Methods inherited from class java.lang.Object

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

Constructor Detail

NoOpSubQueryConverter

private NoOpSubQueryConverter()

Method Detail

canConvertSubQuery

public boolean canConvertSubQuery()

Specified by:

canConvertSubQuery in interface SubQueryConverter

Returns:

Whether the sub-query can be converted

convertSubQuery

public RexNode convertSubQuery(SqlCall subQuery,
                               SqlToRelConverter parentConverter,
                               boolean isExists,
                               boolean isExplain)

Description copied from interface: SubQueryConverter

Converts the sub-query to an equivalent expression.

Specified by:

convertSubQuery in interface SubQueryConverter

Parameters:

subQuery - the SqlNode tree corresponding to a sub-query

parentConverter - sqlToRelConverter of the parent query

isExists - whether the sub-query is part of an EXISTS expression

isExplain - whether the sub-query is part of an EXPLAIN PLAN statement

Returns:

the equivalent expression or null if the sub-query couldn't be converted