org.apache.calcite.sql.type

Class InferTypes

java.lang.Object

org.apache.calcite.sql.type.InferTypes

public abstract class InferTypes
extends Object

Strategies for inferring operand types.

See Also:

SqlOperandTypeInference, ReturnTypes

Field Summary

Fields

Modifier and Type	Field and Description
static SqlOperandTypeInference	BOOLEAN Operand type-inference strategy where an unknown operand type is assumed to be boolean.
static SqlOperandTypeInference	FIRST_KNOWN Operand type-inference strategy where an unknown operand type is derived from the first operand with a known type.
static SqlOperandTypeInference	RETURN_TYPE Operand type-inference strategy where an unknown operand type is derived from the call's return type.
static SqlOperandTypeInference	VARCHAR_1024 Operand type-inference strategy where an unknown operand type is assumed to be VARCHAR(1024).

Method Summary

Methods

Modifier and Type	Method and Description
static SqlOperandTypeInference	explicit(List<RelDataType> types) Returns an SqlOperandTypeInference that returns a given list of types.

Methods inherited from class java.lang.Object

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

Field Detail

FIRST_KNOWN

public static final SqlOperandTypeInference FIRST_KNOWN

Operand type-inference strategy where an unknown operand type is derived from the first operand with a known type.

RETURN_TYPE

public static final SqlOperandTypeInference RETURN_TYPE

Operand type-inference strategy where an unknown operand type is derived from the call's return type. If the return type is a record, it must have the same number of fields as the number of operands.

BOOLEAN

public static final SqlOperandTypeInference BOOLEAN

Operand type-inference strategy where an unknown operand type is assumed to be boolean.

VARCHAR_1024

public static final SqlOperandTypeInference VARCHAR_1024

Operand type-inference strategy where an unknown operand type is assumed to be VARCHAR(1024). This is not something which should be used in most cases (especially since the precision is arbitrary), but for IS [NOT] NULL, we don't really care about the type at all, so it's reasonable to use something that every other type can be cast to.

Method Detail

explicit

public static SqlOperandTypeInference explicit(List<RelDataType> types)

Returns an SqlOperandTypeInference that returns a given list of types.