Package org.apache.calcite.sql.fun

Class SqlSumEmptyIsZeroAggFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.SqlAggFunction

org.apache.calcite.sql.fun.SqlSumEmptyIsZeroAggFunction

All Implemented Interfaces:

Context, Wrapper

public class SqlSumEmptyIsZeroAggFunction
extends SqlAggFunction

Sum0 is an aggregator which returns the sum of the values which go into it like Sum. It differs in that when no non null values are applied zero is returned instead of null. Can be used along with Count to implement Sum.

Field Summary

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

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor	Description
SqlSumEmptyIsZeroAggFunction()

Method Summary

Modifier and Type	Method	Description
List<RelDataType>	getParameterTypes(RelDataTypeFactory typeFactory)
RelDataType	getReturnType(RelDataTypeFactory typeFactory)
SqlAggFunction	getRollup()	Gets rollup aggregation function.
<T> @Nullable T	unwrap(Class<T> clazz)	Finds an instance of an interface implemented by this object, or returns null if this object does not support that interface.

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

allowsFilter, allowsNullTreatment, getDistinctOptionality, isAggregator, isPercentile, isQuantifierAllowed, requiresGroupOrder, requiresOrder, requiresOver, validateCall

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

deriveType, getFunctionType, getNameAsId, getParamNames, getParamTypes, getSqlIdentifier, getSyntax, unparse, 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, getSqlCallFactory, getStrongPolicyInference, hashCode, inferReturnType, inferReturnType, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, isSymmetrical, leftPrec, not, preValidateCall, requiresDecimalExpansion, reverse, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateOperands, validRexOperands

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.schema.Wrapper

maybeUnwrap, unwrapOrThrow

Constructor Details

SqlSumEmptyIsZeroAggFunction

public SqlSumEmptyIsZeroAggFunction()

Method Details

getParameterTypes

public List<RelDataType> getParameterTypes(RelDataTypeFactory typeFactory)

Overrides:

getParameterTypes in class SqlAggFunction

getReturnType

public RelDataType getReturnType(RelDataTypeFactory typeFactory)

Overrides:

getReturnType in class SqlAggFunction

unwrap

public <T> @Nullable T unwrap(Class<T> clazz)

Description copied from interface: Wrapper

Finds an instance of an interface implemented by this object, or returns null if this object does not support that interface.

Specified by:

unwrap in interface Wrapper

Overrides:

unwrap in class SqlAggFunction

getRollup

public SqlAggFunction getRollup()

Description copied from class: SqlAggFunction

Gets rollup aggregation function.

Overrides:

getRollup in class SqlAggFunction