org.apache.calcite.sql.fun

Class SqlCovarAggFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.SqlAggFunction

org.apache.calcite.sql.fun.SqlCovarAggFunction

public class SqlCovarAggFunction
extends SqlAggFunction

Covar is an aggregator which returns the Covariance of the values which go into it. It has precisely two arguments of numeric type (int, long, float, double), and the result is the same type.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SqlCovarAggFunction.Subtype Enum for defining specific types.

Field Summary

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

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor and Description
SqlCovarAggFunction(RelDataType type, SqlCovarAggFunction.Subtype subtype) Creates a SqlCovarAggFunction.

Method Summary

Methods

Modifier and Type	Method and Description
List<RelDataType>	getParameterTypes(RelDataTypeFactory typeFactory)
RelDataType	getReturnType(RelDataTypeFactory typeFactory)
SqlCovarAggFunction.Subtype	getSubtype() Returns the specific function, e.g.

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

Constructor Detail

SqlCovarAggFunction

public SqlCovarAggFunction(RelDataType type,
                   SqlCovarAggFunction.Subtype subtype)

Creates a SqlCovarAggFunction.

Parameters:

type - Data type

subtype - Specific function, e.g. COVAR_POP

Method Detail

getParameterTypes

public List<RelDataType> getParameterTypes(RelDataTypeFactory typeFactory)

getReturnType

public RelDataType getReturnType(RelDataTypeFactory typeFactory)

getSubtype

public SqlCovarAggFunction.Subtype getSubtype()

Returns the specific function, e.g. COVAR_POP or COVAR_SAMP.

Returns:

Subtype