Package org.apache.calcite.sql.type

Class SqlReturnTypeInferenceChain

java.lang.Object

org.apache.calcite.sql.type.SqlReturnTypeInferenceChain

All Implemented Interfaces:

SqlReturnTypeInference

public class SqlReturnTypeInferenceChain
extends Object
implements SqlReturnTypeInference

Strategy to infer the type of an operator call from the type of the operands by using a series of SqlReturnTypeInference rules in a given order. If a rule fails to find a return type (by returning NULL), next rule is tried until there are no more rules in which case NULL will be returned.

Method Summary

Modifier and Type	Method	Description
@Nullable 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

Methods inherited from interface org.apache.calcite.sql.type.SqlReturnTypeInference

andThen, orElse

Method Details

inferReturnType

public @Nullable 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