MatchReturnTypeInference (Apache Calcite API)

java.lang.Object
- org.apache.calcite.sql.type.MatchReturnTypeInference

All Implemented Interfaces:

SqlReturnTypeInference
```
public class MatchReturnTypeInference
extends java.lang.Object
implements SqlReturnTypeInference
```
Returns the first type that matches a set of given SqlTypeNames. If no match could be found, null is returned.

Field Summary

Fields
Modifier and Type Field Description

private int start

private java.util.List<SqlTypeName> typeNames

Constructor Summary

Constructors
Constructor	Description
`MatchReturnTypeInference(int start, java.lang.Iterable<SqlTypeName> typeNames)`	Returns the first type matching any type in typeNames at or after position start (zero based).
`MatchReturnTypeInference(int start, SqlTypeName... typeNames)`	Returns the first type of typeName at or after position start (zero based).

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`RelDataType`	`inferReturnType(SqlOperatorBinding opBinding)`	Infers the return type of a call to an `SqlOperator`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - start
```
private final int start
```
  - typeNames
```
private final java.util.List<SqlTypeName> typeNames
```
- Constructor Detail
  - MatchReturnTypeInference
```
public MatchReturnTypeInference(int start,
                                SqlTypeName... typeNames)
```
    Returns the first type of typeName at or after position start (zero based).
    
    See Also:
    
    MatchReturnTypeInference(int, SqlTypeName[])
  - MatchReturnTypeInference
```
public MatchReturnTypeInference(int start,
                                java.lang.Iterable<SqlTypeName> typeNames)
```
    Returns the first type matching any type in typeNames at or after position start (zero based).
- Method Detail
  - inferReturnType
```
public RelDataType inferReturnType(SqlOperatorBinding opBinding)
```
    Description copied from interface: SqlReturnTypeInference
    
    Infers the return type of a call to an SqlOperator.
    
    Specified by:
    
    inferReturnType in interface SqlReturnTypeInference
    
    Parameters:
    
    opBinding - description of operator binding
    
    Returns:
    
    inferred type; may be null