org.apache.calcite.sql.fun

Class SqlMinMaxAggFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.SqlAggFunction

org.apache.calcite.sql.fun.SqlMinMaxAggFunction

public class SqlMinMaxAggFunction
extends SqlAggFunction

Definition of the MIN and MAX aggregate functions, returning the returns the smallest/largest of the values which go into it.

There are 3 forms:

sum(primitive type)

values are compared using '<'

sum(Comparable)

values are compared using Comparable.compareTo(T)

sum(Comparator, Object)

the Comparator.compare(T, T) method of the comparator is used to compare pairs of objects. The comparator is a startup argument, and must therefore be constant for the duration of the aggregation.

Field Summary

Fields

Modifier and Type	Field and Description
List<RelDataType>	argTypes
static int	MINMAX_COMPARABLE
static int	MINMAX_COMPARATOR
static int	MINMAX_INVALID
static int	MINMAX_PRIMITIVE

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

MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor and Description
SqlMinMaxAggFunction(List<RelDataType> argTypes, boolean isMin, int kind)

Method Summary

Methods

Modifier and Type	Method and Description
int	getMinMaxKind()
List<RelDataType>	getParameterTypes(RelDataTypeFactory typeFactory)
RelDataType	getReturnType(RelDataTypeFactory typeFactory)
boolean	isMin()

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

isAggregator, isQuantifierAllowed, validateCall

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

deriveType, getFunctionType, getNameAsId, getParamTypes, getSqlIdentifier, getSyntax, unparse, validateQuantifier

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

acceptCall, acceptCall, adjustType, allowsFraming, argumentMustBeScalar, checkOperandCount, checkOperandTypes, createCall, createCall, createCall, createCall, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, hashCode, inferReturnType, inferReturnType, isDeterministic, isDynamicFunction, isName, leftPrec, preValidateCall, requiresDecimalExpansion, requiresOrder, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateOperands, validRexOperands

Methods inherited from class java.lang.Object

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

Field Detail

MINMAX_INVALID

public static final int MINMAX_INVALID

See Also:

Constant Field Values

MINMAX_PRIMITIVE

public static final int MINMAX_PRIMITIVE

See Also:

Constant Field Values

MINMAX_COMPARABLE

public static final int MINMAX_COMPARABLE

See Also:

Constant Field Values

MINMAX_COMPARATOR

public static final int MINMAX_COMPARATOR

See Also:

Constant Field Values

argTypes

public final List<RelDataType> argTypes

Constructor Detail

SqlMinMaxAggFunction

public SqlMinMaxAggFunction(List<RelDataType> argTypes,
                    boolean isMin,
                    int kind)

Method Detail

isMin

public boolean isMin()

getMinMaxKind

public int getMinMaxKind()

getParameterTypes

public List<RelDataType> getParameterTypes(RelDataTypeFactory typeFactory)

getReturnType

public RelDataType getReturnType(RelDataTypeFactory typeFactory)