Package org.apache.calcite.sql

Class SqlUnresolvedFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.SqlUnresolvedFunction

public class SqlUnresolvedFunction
extends SqlFunction

Placeholder for an unresolved function.

Created by the parser, then it is rewritten to proper SqlFunction by the validator to a function defined in a Calcite schema.

Field Summary

Fields inherited from class org.apache.calcite.sql.SqlOperator

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor	Description
SqlUnresolvedFunction(SqlIdentifier sqlIdentifier, @Nullable SqlReturnTypeInference returnTypeInference, @Nullable SqlOperandTypeInference operandTypeInference, @Nullable SqlOperandTypeChecker operandTypeChecker, @Nullable List<RelDataType> paramTypes, SqlFunctionCategory funcType)	Creates a placeholder SqlUnresolvedFunction for an invocation of a function with a possibly qualified name.

Method Summary

Modifier and Type	Method	Description
RelDataType	inferReturnType(SqlOperatorBinding opBinding)	Infers the return type of an invocation of this operator; only called after the number and types of operands have already been validated.

Methods inherited from class org.apache.calcite.sql.SqlFunction

deriveType, getFunctionType, getNameAsId, getParamNames, getParamTypes, getSqlIdentifier, getSyntax, isQuantifierAllowed, unparse, validateCall, validateQuantifier

Methods inherited from class org.apache.calcite.sql.SqlOperator

acceptCall, acceptCall, adjustType, allowsFraming, argumentMustBeScalar, checkOperandCount, checkOperandTypes, constructArgNameList, constructArgTypeList, constructOperandList, createCall, createCall, createCall, createCall, createCall, createCall, createCall, deriveOperandType, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getMonotonicity, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, getStrongPolicyInference, hashCode, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, isSymmetrical, leftPrec, not, preValidateCall, requiresDecimalExpansion, requiresOrder, requiresOver, reverse, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateOperands, validRexOperands

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

SqlUnresolvedFunction

public SqlUnresolvedFunction(SqlIdentifier sqlIdentifier,
 @Nullable SqlReturnTypeInference returnTypeInference,
 @Nullable SqlOperandTypeInference operandTypeInference,
 @Nullable SqlOperandTypeChecker operandTypeChecker,
 @Nullable List<RelDataType> paramTypes,
 SqlFunctionCategory funcType)

Creates a placeholder SqlUnresolvedFunction for an invocation of a function with a possibly qualified name. This name must be resolved into either a builtin function or a user-defined function.

Parameters:

sqlIdentifier - possibly qualified identifier for function

returnTypeInference - strategy to use for return type inference

operandTypeInference - strategy to use for parameter type inference

operandTypeChecker - strategy to use for parameter type checking

paramTypes - array of parameter types

funcType - function category

Method Details

inferReturnType

public RelDataType inferReturnType(SqlOperatorBinding opBinding)

Infers the return type of an invocation of this operator; only called after the number and types of operands have already been validated. Subclasses must either override this method or supply an instance of SqlReturnTypeInference to the constructor.T

The operator class for this function isn't resolved to the correct class. This happens in the case of user defined functions. Return the return type to be 'ANY', so we don't fail.

Overrides:

inferReturnType in class SqlOperator

Parameters:

opBinding - description of invocation (not necessarily a SqlCall)

Returns:

inferred return type