org.apache.calcite.adapter.druid

Class NaryOperatorConverter

java.lang.Object

org.apache.calcite.adapter.druid.NaryOperatorConverter

All Implemented Interfaces:

DruidSqlOperatorConverter

public class NaryOperatorConverter
extends Object
implements DruidSqlOperatorConverter

Converts Calcite n-ary operators to druid expression eg (arg1 Op arg2 Op arg3)

Field Summary

Fields

Modifier and Type	Field and Description
private String	druidOperatorName
private SqlOperator	operator

Constructor Summary

Constructors

Constructor and Description
NaryOperatorConverter(SqlOperator operator, String druidOperatorName)

Method Summary

Modifier and Type	Method and Description
SqlOperator	calciteOperator() Returns the calcite SQL operator corresponding to Druid operator.
String	toDruidExpression(RexNode rexNode, RelDataType rowType, DruidQuery druidQuery) Translate rexNode to valid Druid expression.

Methods inherited from class java.lang.Object

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

Field Detail

operator

private final SqlOperator operator

druidOperatorName

private final String druidOperatorName

Constructor Detail

NaryOperatorConverter

public NaryOperatorConverter(SqlOperator operator,
                             String druidOperatorName)

Method Detail

calciteOperator

public SqlOperator calciteOperator()

Description copied from interface: DruidSqlOperatorConverter

Returns the calcite SQL operator corresponding to Druid operator.

Specified by:

calciteOperator in interface DruidSqlOperatorConverter

Returns:

operator

toDruidExpression

@Nullable
public String toDruidExpression(RexNode rexNode,
                                          RelDataType rowType,
                                          DruidQuery druidQuery)

Description copied from interface: DruidSqlOperatorConverter

Translate rexNode to valid Druid expression.

Specified by:

toDruidExpression in interface DruidSqlOperatorConverter

Parameters:

rexNode - rexNode to translate to Druid expression

rowType - row type associated with rexNode

druidQuery - druid query used to figure out configs/fields related like timeZone

Returns:

valid Druid expression or null if it can not convert the rexNode