AuxiliaryConverter (Flink : 2.0-SNAPSHOT API)

All Known Implementing Classes:

AuxiliaryConverter.Impl
```
public interface AuxiliaryConverter
```
Converts an expression for a group window function (e.g. TUMBLE) into an expression for an auxiliary group function (e.g. TUMBLE_START).

See Also:

SqlStdOperatorTable.TUMBLE

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static class AuxiliaryConverter.Impl
Simple implementation of AuxiliaryConverter.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`org.apache.calcite.rex.RexNode`	`convert(org.apache.calcite.rex.RexBuilder rexBuilder, org.apache.calcite.rex.RexNode groupCall, org.apache.calcite.rex.RexNode e)`	Converts an expression.

- Method Detail
  - convert
```
org.apache.calcite.rex.RexNode convert(org.apache.calcite.rex.RexBuilder rexBuilder,
                                       org.apache.calcite.rex.RexNode groupCall,
                                       org.apache.calcite.rex.RexNode e)
```
    Converts an expression.
    
    Parameters:
    
    rexBuilder - Rex builder
    
    groupCall - Call to the group function, e.g. "TUMBLE($2, 36000)"
    
    e - Expression holding result of the group function, e.g. "$0"
    
    Returns:
    
    Expression for auxiliary function, e.g. "$0 + 36000" converts the result of TUMBLE to the result of TUMBLE_END