org.apache.calcite.adapter.druid

Class DruidSqlCastConverter

java.lang.Object

org.apache.calcite.adapter.druid.DruidSqlCastConverter

All Implemented Interfaces:

DruidSqlOperatorConverter

public class DruidSqlCastConverter
extends Object
implements DruidSqlOperatorConverter

Druid cast converter operator used to translates calcite casts to Druid expression cast

Constructor Summary

Constructors

Constructor and Description
DruidSqlCastConverter()

Method Summary

Modifier and Type	Method and Description
SqlOperator	calciteOperator() Returns the calcite SQL operator corresponding to Druid operator.
private static String	castCharToDateTime(TimeZone timeZone, String operand, SqlTypeName toType)
private static String	castDateTimeToChar(TimeZone timeZone, String operand, SqlTypeName fromType)
static String	dateTimeFormatString(SqlTypeName sqlTypeName)
String	toDruidExpression(RexNode rexNode, RelDataType topRel, 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

Constructor Detail

DruidSqlCastConverter

public DruidSqlCastConverter()

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

public String toDruidExpression(RexNode rexNode,
                                RelDataType topRel,
                                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

topRel - 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

castCharToDateTime

private static String castCharToDateTime(TimeZone timeZone,
                                         String operand,
                                         SqlTypeName toType)

castDateTimeToChar

private static String castDateTimeToChar(TimeZone timeZone,
                                         String operand,
                                         SqlTypeName fromType)

dateTimeFormatString

public static String dateTimeFormatString(SqlTypeName sqlTypeName)