org.apache.hadoop.hive.ql.optimizer.calcite.functions

Class HiveSqlSumEmptyIsZeroAggFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.SqlAggFunction

org.apache.hadoop.hive.ql.optimizer.calcite.functions.HiveSqlSumEmptyIsZeroAggFunction

All Implemented Interfaces:

org.apache.calcite.plan.Context, org.apache.calcite.schema.Wrapper

public class HiveSqlSumEmptyIsZeroAggFunction
extends org.apache.calcite.sql.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 and Description
HiveSqlSumEmptyIsZeroAggFunction(boolean isDistinct, org.apache.calcite.sql.type.SqlReturnTypeInference returnTypeInference, org.apache.calcite.sql.type.SqlOperandTypeInference operandTypeInference, org.apache.calcite.sql.type.SqlOperandTypeChecker operandTypeChecker)

Method Summary

Modifier and Type	Method and Description
List<org.apache.calcite.rel.type.RelDataType>	getParameterTypes(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)
org.apache.calcite.rel.type.RelDataType	getReturnType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)
<T> T	unwrap(Class<T> clazz)

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

allowsFilter, isAggregator, isQuantifierAllowed, 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, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getMonotonicity, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, hashCode, inferReturnType, inferReturnType, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, leftPrec, preValidateCall, requiresDecimalExpansion, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateOperands, validRexOperands

Methods inherited from class java.lang.Object

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

Constructor Detail

HiveSqlSumEmptyIsZeroAggFunction

public HiveSqlSumEmptyIsZeroAggFunction(boolean isDistinct,
                                        org.apache.calcite.sql.type.SqlReturnTypeInference returnTypeInference,
                                        org.apache.calcite.sql.type.SqlOperandTypeInference operandTypeInference,
                                        org.apache.calcite.sql.type.SqlOperandTypeChecker operandTypeChecker)

Method Detail

getParameterTypes

public List<org.apache.calcite.rel.type.RelDataType> getParameterTypes(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)

Overrides:

getParameterTypes in class org.apache.calcite.sql.SqlAggFunction

getReturnType

public org.apache.calcite.rel.type.RelDataType getReturnType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)

Overrides:

getReturnType in class org.apache.calcite.sql.SqlAggFunction

unwrap

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

Specified by:

unwrap in interface org.apache.calcite.schema.Wrapper

Overrides:

unwrap in class org.apache.calcite.sql.SqlAggFunction