org.eigenbase.sql.fun
Class SqlAbstractTimeFunction

java.lang.Object
  org.eigenbase.sql.SqlOperator
      org.eigenbase.sql.SqlFunction
          org.eigenbase.sql.fun.SqlAbstractTimeFunction

public class SqlAbstractTimeFunction
extends SqlFunction

Base class for time functions such as "LOCALTIME", "LOCALTIME(n)".

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/fun/SqlAbstractTimeFunction.java#13 $

Author:

John V. Sichi

Field Summary

private static SqlOperandTypeChecker	otcCustom
private SqlTypeName	typeName

Fields inherited from class org.eigenbase.sql.SqlOperator

MaxPrec, NL

Constructor Summary

protected

SqlAbstractTimeFunction(String name, SqlTypeName typeName)

Method Summary

SqlMonotonicity	getMonotonicity(SqlCall call, SqlValidatorScope scope) Returns whether this operator is monotonic.
SqlSyntax	getSyntax() Returns the syntactic type of this operator.
RelDataType	inferReturnType(SqlOperatorBinding opBinding) Infers the return type of an invocation of this operator; only called after the number and types of operands have already been validated.
boolean	isDynamicFunction()

Methods inherited from class org.eigenbase.sql.SqlFunction

deriveType, getFunctionType, getNameAsId, getParamTypes, getSqlIdentifier, isQuantifierAllowed, unparse, validateCall, validateQuantifier

Methods inherited from class org.eigenbase.sql.SqlOperator

acceptCall, acceptCall, adjustType, argumentMustBeScalar, checkOperandCount, checkOperandTypes, createCall, createCall, createCall, createCall, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, hashCode, inferReturnType, isAggregator, isDeterministic, isName, leftPrec, preValidateCall, requiresDecimalExpansion, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateOperands

Methods inherited from class java.lang.Object

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

Field Detail

otcCustom

private static final SqlOperandTypeChecker otcCustom

typeName

private final SqlTypeName typeName

Constructor Detail

SqlAbstractTimeFunction

protected SqlAbstractTimeFunction(String name,
                                  SqlTypeName typeName)

Method Detail

getSyntax

public SqlSyntax getSyntax()

Description copied from class: SqlOperator

Returns the syntactic type of this operator.

Overrides:

getSyntax in class SqlFunction

inferReturnType

public RelDataType inferReturnType(SqlOperatorBinding opBinding)

Description copied from class: SqlOperator

Infers the return type of an invocation of this operator; only called after the number and types of operands have already been validated. Subclasses must either override this method or supply an instance of SqlReturnTypeInference to the constructor.

Overrides:

inferReturnType in class SqlOperator

Parameters:

opBinding - description of invocation (not necessarily a SqlCall)

Returns:

inferred return type

getMonotonicity

public SqlMonotonicity getMonotonicity(SqlCall call,
                                       SqlValidatorScope scope)

Description copied from class: SqlOperator

Returns whether this operator is monotonic.

Default implementation returns SqlMonotonicity.NotMonotonic.

Overrides:

getMonotonicity in class SqlOperator

Parameters:

call - Call to this operator

scope - Scope in which the call occurs

isDynamicFunction

public boolean isDynamicFunction()

Overrides:

isDynamicFunction in class SqlOperator

Returns:

true iff it is unsafe to cache query plans referencing this operator; false is assumed by default