org.apache.calcite.sql.fun

Class SqlCountAggFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.SqlAggFunction

org.apache.calcite.sql.fun.SqlCountAggFunction

public class SqlCountAggFunction
extends SqlAggFunction

Definition of the SQL COUNT aggregation function.

COUNT is an aggregator which returns the number of rows which have gone into it. With one argument (or more), it returns the number of rows for which that argument (or all) is not null.

Field Summary

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

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor and Description
SqlCountAggFunction()

Method Summary

Methods

Modifier and Type	Method and Description
RelDataType	deriveType(SqlValidator validator, SqlValidatorScope scope, SqlCall call) Derives the type of a call to this operator.
List<RelDataType>	getParameterTypes(RelDataTypeFactory typeFactory)
RelDataType	getReturnType(RelDataTypeFactory typeFactory)
SqlSyntax	getSyntax() Returns the syntactic type of this operator, never null.

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

isAggregator, isQuantifierAllowed, validateCall

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

getFunctionType, getNameAsId, getParamTypes, getSqlIdentifier, 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

SqlCountAggFunction

public SqlCountAggFunction()

Method Detail

getSyntax

public SqlSyntax getSyntax()

Description copied from class: SqlOperator

Returns the syntactic type of this operator, never null.

Overrides:

getSyntax in class SqlFunction

getParameterTypes

public List<RelDataType> getParameterTypes(RelDataTypeFactory typeFactory)

getReturnType

public RelDataType getReturnType(RelDataTypeFactory typeFactory)

deriveType

public RelDataType deriveType(SqlValidator validator,
                     SqlValidatorScope scope,
                     SqlCall call)

Description copied from class: SqlOperator

Derives the type of a call to this operator.

This method is an intrinsic part of the validation process so, unlike SqlOperator.inferReturnType(org.apache.calcite.sql.SqlOperatorBinding), specific operators would not typically override this method.

Overrides:

deriveType in class SqlFunction

Parameters:

validator - Validator

scope - Scope of validation

call - Call to this operator

Returns:

Type of call