ExtractOperatorConversion (Apache Calcite API)

java.lang.Object
- org.apache.calcite.adapter.druid.ExtractOperatorConversion

All Implemented Interfaces:

DruidSqlOperatorConverter
```
public class ExtractOperatorConversion
extends java.lang.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

Field Summary

Fields
Modifier and Type Field Description

private static java.util.Map<org.apache.calcite.avatica.util.TimeUnitRange,java.lang.String> EXTRACT_UNIT_MAP

Constructor Summary

Constructors
Constructor Description

ExtractOperatorConversion()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`SqlOperator`	`calciteOperator()`	Returns the calcite SQL operator corresponding to Druid operator.
`java.lang.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

- Field Detail
  - EXTRACT_UNIT_MAP
```
private static final java.util.Map<org.apache.calcite.avatica.util.TimeUnitRange,java.lang.String> EXTRACT_UNIT_MAP
```
- Constructor Detail
  - ExtractOperatorConversion
```
public ExtractOperatorConversion()
```
- 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 java.lang.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