Package org.apache.calcite.adapter.druid

Class ExtractOperatorConversion

java.lang.Object

org.apache.calcite.adapter.druid.ExtractOperatorConversion

All Implemented Interfaces:

DruidSqlOperatorConverter

public class ExtractOperatorConversion
extends Object
implements DruidSqlOperatorConverter

Time extract operator conversion for expressions like EXTRACT(timeUnit FROM arg).

Unit can be SECOND, MINUTE, HOUR, DAY (day of month), DOW (day of week), DOY (day of year), WEEK (week of week year), MONTH (1 through 12), QUARTER (1 through 4), or YEAR.

Constructor Summary

Constructors

Constructor	Description
ExtractOperatorConversion()

Method Summary

Modifier and Type	Method	Description
SqlOperator	calciteOperator()	Returns the calcite SQL operator corresponding to Druid operator.
@Nullable String	toDruidExpression(RexNode rexNode, RelDataType rowType, DruidQuery query)	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 Details

ExtractOperatorConversion

public ExtractOperatorConversion()

Method Details

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

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

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

Returns:

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