org.apache.calcite.sql.type

Class AssignableOperandTypeChecker

java.lang.Object

org.apache.calcite.sql.type.AssignableOperandTypeChecker

All Implemented Interfaces:

SqlOperandTypeChecker

public class AssignableOperandTypeChecker
extends Object
implements SqlOperandTypeChecker

AssignableOperandTypeChecker implements SqlOperandTypeChecker by verifying that the type of each argument is assignable to a predefined set of parameter types (under the SQL definition of "assignable").

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.calcite.sql.type.SqlOperandTypeChecker

SqlOperandTypeChecker.Consistency

Field Summary

Fields

Modifier and Type	Field and Description
private com.google.common.collect.ImmutableList<String>	paramNames
private List<RelDataType>	paramTypes

Constructor Summary

Constructors

Constructor and Description
AssignableOperandTypeChecker(List<RelDataType> paramTypes, List<String> paramNames) Instantiates this strategy with a specific set of parameter types.

Method Summary

Modifier and Type	Method and Description
boolean	checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure) Checks the types of all operands to an operator call.
String	getAllowedSignatures(SqlOperator op, String opName) Returns a string describing the allowed formal signatures of a call, e.g.
SqlOperandTypeChecker.Consistency	getConsistency() Returns the strategy for making the arguments have consistency types.
SqlOperandCountRange	getOperandCountRange()
boolean	isOptional(int i) Returns whether the ith operand is optional.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

paramTypes

private final List<RelDataType> paramTypes

paramNames

private final com.google.common.collect.ImmutableList<String> paramNames

Constructor Detail

AssignableOperandTypeChecker

public AssignableOperandTypeChecker(List<RelDataType> paramTypes,
                                    List<String> paramNames)

Instantiates this strategy with a specific set of parameter types.

Parameters:

paramTypes - parameter types for operands; index in this array corresponds to operand number

paramNames - parameter names, or null

Method Detail

isOptional

public boolean isOptional(int i)

Description copied from interface: SqlOperandTypeChecker

Returns whether the ith operand is optional.

Specified by:

isOptional in interface SqlOperandTypeChecker

getOperandCountRange

public SqlOperandCountRange getOperandCountRange()

Specified by:

getOperandCountRange in interface SqlOperandTypeChecker

Returns:

range of operand counts allowed in a call

checkOperandTypes

public boolean checkOperandTypes(SqlCallBinding callBinding,
                                 boolean throwOnFailure)

Description copied from interface: SqlOperandTypeChecker

Checks the types of all operands to an operator call.

Specified by:

checkOperandTypes in interface SqlOperandTypeChecker

Parameters:

callBinding - description of the call to be checked

throwOnFailure - whether to throw an exception if check fails (otherwise returns false in that case)

Returns:

whether check succeeded

getAllowedSignatures

public String getAllowedSignatures(SqlOperator op,
                                   String opName)

Description copied from interface: SqlOperandTypeChecker

Returns a string describing the allowed formal signatures of a call, e.g. "SUBSTR(VARCHAR, INTEGER, INTEGER)".

Specified by:

getAllowedSignatures in interface SqlOperandTypeChecker

Parameters:

op - the operator being checked

opName - name to use for the operator in case of aliasing

Returns:

generated string

getConsistency

public SqlOperandTypeChecker.Consistency getConsistency()

Description copied from interface: SqlOperandTypeChecker

Returns the strategy for making the arguments have consistency types.

Specified by:

getConsistency in interface SqlOperandTypeChecker