org.eigenbase.sql.fun
Class SqlNewOperator

java.lang.Object
  org.eigenbase.sql.SqlOperator
      org.eigenbase.sql.SqlPrefixOperator
          org.eigenbase.sql.fun.SqlNewOperator

public class SqlNewOperator
extends SqlPrefixOperator

SqlNewOperator represents an SQL new specification such as NEW UDT(1, 2). When used in an SqlCall, SqlNewOperator takes a single operand, which is an invocation of the constructor method; but when used in a RexCall, the operands are the initial values to be used for the new instance.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/fun/SqlNewOperator.java#8 $

Author:

John V. Sichi

Field Summary

Fields inherited from class org.eigenbase.sql.SqlOperator

MaxPrec, NL

Constructor Summary

SqlNewOperator()

Method Summary

boolean	requiresDecimalExpansion() Method to check if call requires expansion when it has decimal operands.
SqlNode	rewriteCall(SqlValidator validator, SqlCall call) Rewrites a call to this operator.

Methods inherited from class org.eigenbase.sql.SqlPrefixOperator

adjustType, getMonotonicity, getSignatureTemplate, getSyntax

Methods inherited from class org.eigenbase.sql.SqlOperator

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

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlNewOperator

public SqlNewOperator()

Method Detail

rewriteCall

public SqlNode rewriteCall(SqlValidator validator,
                           SqlCall call)

Description copied from class: SqlOperator

Rewrites a call to this operator. Some operators are implemented as trivial rewrites (e.g. NULLIF becomes CASE). However, we don't do this at createCall time because we want to preserve the original SQL syntax as much as possible; instead, we do this before the call is validated (so the trivial operator doesn't need its own implementation of type derivation methods). The default implementation is to just return the original call without any rewrite.

Overrides:

rewriteCall in class SqlOperator

call - to be rewritten

Returns:

rewritten call

requiresDecimalExpansion

public boolean requiresDecimalExpansion()

Description copied from class: SqlOperator

Method to check if call requires expansion when it has decimal operands. The default implementation is to return true.

Overrides:

requiresDecimalExpansion in class SqlOperator