org.eigenbase.sql
Class SqlBinaryOperator

java.lang.Object
  org.eigenbase.sql.SqlOperator
      org.eigenbase.sql.SqlBinaryOperator

Direct Known Subclasses:

SqlInOperator, SqlMonotonicBinaryOperator, SqlMultisetMemberOfOperator, SqlMultisetSetOperator, SqlOverOperator, SqlSetOperator

public class SqlBinaryOperator
extends SqlOperator

SqlBinaryOperator is a binary operator.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/SqlBinaryOperator.java#16 $

Field Summary

Fields inherited from class org.eigenbase.sql.SqlOperator

MaxPrec, NL

Constructor Summary

SqlBinaryOperator(String name, SqlKind kind, int prec, boolean leftAssoc, SqlReturnTypeInference returnTypeInference, SqlOperandTypeInference operandTypeInference, SqlOperandTypeChecker operandTypeChecker)
Creates a SqlBinaryOperator.

Method Summary

protected RelDataType	adjustType(SqlValidator validator, SqlCall call, RelDataType type) Validates and determines coercibility and resulting collation name of binary operator if needed.
RelDataType	deriveType(SqlValidator validator, SqlValidatorScope scope, SqlCall call) Derives the type of a call to this operator.
SqlMonotonicity	getMonotonicity(SqlCall call, SqlValidatorScope scope) Returns whether this operator is monotonic.
String	getSignatureTemplate(int operandsCount) Returns a template describing how the operator signature is to be built.
SqlSyntax	getSyntax() Returns the syntactic type of this operator.
(package private) boolean	needsSpace() Returns whether this operator should be surrounded by space when unparsed.

Methods inherited from class org.eigenbase.sql.SqlOperator

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

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlBinaryOperator

public SqlBinaryOperator(String name,
                         SqlKind kind,
                         int prec,
                         boolean leftAssoc,
                         SqlReturnTypeInference returnTypeInference,
                         SqlOperandTypeInference operandTypeInference,
                         SqlOperandTypeChecker operandTypeChecker)

Creates a SqlBinaryOperator.

Parameters:

name - Name of operator

kind - Kind

prec - Precedence

leftAssoc - Left-associativity

returnTypeInference - Strategy to infer return type

operandTypeInference - Strategy to infer operand types

operandTypeChecker - Validator for operand types

Method Detail

getSyntax

public SqlSyntax getSyntax()

Description copied from class: SqlOperator

Returns the syntactic type of this operator.

Specified by:

getSyntax in class SqlOperator

getSignatureTemplate

public String getSignatureTemplate(int operandsCount)

Description copied from class: SqlOperator

Returns a template describing how the operator signature is to be built. E.g for the binary + operator the template looks like "{1} {0} {2}" {0} is the operator, subsequent numbers are operands.

Overrides:

getSignatureTemplate in class SqlOperator

Parameters:

operandsCount - is used with functions that can take a variable number of operands

Returns:

signature template, or null to indicate that a default template will suffice

needsSpace

boolean needsSpace()

Returns whether this operator should be surrounded by space when unparsed.

Returns true for most operators but false for the '.' operator; consider

x.y + 5 * 6

Returns:

whether this operator should be surrounded by space

adjustType

protected RelDataType adjustType(SqlValidator validator,
                                 SqlCall call,
                                 RelDataType type)

Description copied from class: SqlOperator

Validates and determines coercibility and resulting collation name of binary operator if needed.

Overrides:

adjustType in class SqlOperator

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.eigenbase.sql.SqlOperatorBinding), specific operators would not typically override this method.

Overrides:

deriveType in class SqlOperator

Parameters:

validator - Validator

scope - Scope of validation

call - Call to this operator

Returns:

Type of call

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