org.apache.flink.table.planner.functions.sql

Class SqlFirstLastValueAggFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.SqlAggFunction

org.apache.flink.table.planner.functions.sql.SqlFirstLastValueAggFunction

All Implemented Interfaces:

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

public class SqlFirstLastValueAggFunction
extends org.apache.calcite.sql.SqlAggFunction

FIRST_VALUE and LAST_VALUE aggregate functions return the first or the last value in a list of values that are input to the function.

NOTE: The difference between this and SqlFirstLastValueAggFunction is that this can be used without over clause.

Field Summary

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

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor and Description
SqlFirstLastValueAggFunction(org.apache.calcite.sql.SqlKind kind)

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)

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

allowsFilter, allowsNullTreatment, getDistinctOptionality, isAggregator, isQuantifierAllowed, requiresGroupOrder, requiresOrder, requiresOver, unwrap, 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, getStrongPolicyInference, hashCode, inferReturnType, inferReturnType, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, isSymmetrical, 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

SqlFirstLastValueAggFunction

public SqlFirstLastValueAggFunction(org.apache.calcite.sql.SqlKind kind)

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