org.apache.calcite.sql.fun

Class 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).

See Also:

SqlCastOperator

Field Summary

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

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor and Description
SqlCastFunction()

Method Summary

Modifier and Type	Method and Description
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)

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

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

Methods inherited from class 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

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlCastFunction

public SqlCastFunction()

Method Detail

inferReturnType

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

Overrides:

inferReturnType in class org.apache.calcite.sql.SqlOperator

getSignatureTemplate

public String getSignatureTemplate(int operandsCount)

Overrides:

getSignatureTemplate in class org.apache.calcite.sql.SqlOperator

getOperandCountRange

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

Overrides:

getOperandCountRange in class 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.

Overrides:

checkOperandTypes in class org.apache.calcite.sql.SqlOperator

getSyntax

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

Overrides:

getSyntax in class 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)

Overrides:

unparse in class org.apache.calcite.sql.SqlFunction

getMonotonicity

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

Overrides:

getMonotonicity in class org.apache.calcite.sql.SqlOperator