org.apache.calcite.sql.fun

类 SqlCastFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.fun.SqlCastFunction

public class SqlCastFunction
extends org.apache.calcite.sql.SqlFunction

SqlCastFunction. Note that the std functions are really singleton objects, because they always get fetched via the StdOperatorTable. So you can't store any local info in the class and hence the return type data is maintained in operand[1] through the validation phase.

Can be used for both SqlCall and RexCall. Note that the SqlCall has two operands (expression and type), while the RexCall has one operand (expression) and the type is obtained from RexNode.getType().

The class was copied over because of CALCITE-5017, in order to workaround the method SqlTypeUtil.canCastFrom(RelDataType, RelDataType, boolean). Line 141 in checkOperandTypes(SqlCallBinding, boolean) and new method canCastFrom(RelDataType, RelDataType).

另请参阅:

SqlCastOperator

字段概要

从类继承的字段 org.apache.calcite.sql.SqlOperator

kind, MDX_PRECEDENCE, NL

构造器概要

构造器

构造器和说明
SqlCastFunction()

方法概要

限定符和类型	方法和说明
boolean	checkOperandTypes(org.apache.calcite.sql.SqlCallBinding callBinding, boolean throwOnFailure) Makes sure that the number and types of arguments are allowable.
org.apache.calcite.sql.validate.SqlMonotonicity	getMonotonicity(org.apache.calcite.sql.SqlOperatorBinding call)
org.apache.calcite.sql.SqlOperandCountRange	getOperandCountRange()
String	getSignatureTemplate(int operandsCount)
org.apache.calcite.sql.SqlSyntax	getSyntax()
org.apache.calcite.rel.type.RelDataType	inferReturnType(org.apache.calcite.sql.SqlOperatorBinding opBinding)
void	unparse(org.apache.calcite.sql.SqlWriter writer, org.apache.calcite.sql.SqlCall call, int leftPrec, int rightPrec)

从类继承的方法 org.apache.calcite.sql.SqlFunction

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

从类继承的方法 org.apache.calcite.sql.SqlOperator

acceptCall, acceptCall, adjustType, allowsFraming, argumentMustBeScalar, checkOperandCount, constructArgNameList, constructArgTypeList, constructOperandList, createCall, createCall, createCall, createCall, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getName, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getStrongPolicyInference, hashCode, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, isSymmetrical, leftPrec, preValidateCall, requiresDecimalExpansion, requiresOrder, requiresOver, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateOperands, validRexOperands

从类继承的方法 java.lang.Object

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

构造器详细资料

SqlCastFunction

public SqlCastFunction()

方法详细资料

inferReturnType

public org.apache.calcite.rel.type.RelDataType inferReturnType(org.apache.calcite.sql.SqlOperatorBinding opBinding)

覆盖:

inferReturnType 在类中 org.apache.calcite.sql.SqlOperator

getSignatureTemplate

public String getSignatureTemplate(int operandsCount)

覆盖:

getSignatureTemplate 在类中 org.apache.calcite.sql.SqlOperator

getOperandCountRange

public org.apache.calcite.sql.SqlOperandCountRange getOperandCountRange()

覆盖:

getOperandCountRange 在类中 org.apache.calcite.sql.SqlOperator

checkOperandTypes

public boolean checkOperandTypes(org.apache.calcite.sql.SqlCallBinding callBinding,
                                 boolean throwOnFailure)

Makes sure that the number and types of arguments are allowable. Operators (such as "ROW" and "AS") which do not check their arguments can override this method.

覆盖:

checkOperandTypes 在类中 org.apache.calcite.sql.SqlOperator

getSyntax

public org.apache.calcite.sql.SqlSyntax getSyntax()

覆盖:

getSyntax 在类中 org.apache.calcite.sql.SqlFunction

unparse

public void unparse(org.apache.calcite.sql.SqlWriter writer,
                    org.apache.calcite.sql.SqlCall call,
                    int leftPrec,
                    int rightPrec)

覆盖:

unparse 在类中 org.apache.calcite.sql.SqlFunction

getMonotonicity

public org.apache.calcite.sql.validate.SqlMonotonicity getMonotonicity(org.apache.calcite.sql.SqlOperatorBinding call)

覆盖:

getMonotonicity 在类中 org.apache.calcite.sql.SqlOperator