Class FarragoRngNextRandomIntOperator

  extended by org.eigenbase.sql.SqlOperator
      extended by org.eigenbase.sql.SqlFunction
          extended by net.sf.farrago.rng.FarragoRngNextRandomIntOperator

public class FarragoRngNextRandomIntOperator
extends SqlFunction

FarragoRngNextRandomIntOperator defines the SqlOperator for the NEXT_RANDOM_INT pseudo-function.

$Id: //open/dev/farrago/examples/rng/src/net/sf/farrago/rng/ $
John V. Sichi

Field Summary
Fields inherited from class org.eigenbase.sql.SqlOperator
MaxPrec, NL
Constructor Summary
Method Summary
 void unparse(SqlWriter writer, SqlNode[] operands, int leftPrec, int rightPrec)
          Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.
 void validateCall(SqlCall call, SqlValidator validator, SqlValidatorScope scope, SqlValidatorScope operandScope)
          Validates a call to this operator.
Methods inherited from class org.eigenbase.sql.SqlFunction
deriveType, getFunctionType, getNameAsId, getParamTypes, getSqlIdentifier, getSyntax, isQuantifierAllowed, validateQuantifier
Methods inherited from class org.eigenbase.sql.SqlOperator
acceptCall, acceptCall, adjustType, argumentMustBeScalar, checkOperandCount, checkOperandTypes, createCall, createCall, createCall, createCall, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, hashCode, inferReturnType, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, 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

Constructor Detail


public FarragoRngNextRandomIntOperator()
Method Detail


public void validateCall(SqlCall call,
                         SqlValidator validator,
                         SqlValidatorScope scope,
                         SqlValidatorScope operandScope)
Description copied from class: SqlOperator
Validates a call to this operator.

This method should not perform type-derivation or perform validation related related to types. That is done later, by SqlOperator.deriveType(SqlValidator, SqlValidatorScope, SqlCall). This method should focus on structural validation.

A typical implementation of this method first validates the operands, then performs some operator-specific logic. The default implementation just validates the operands.

This method is the default implementation of SqlCall.validate(org.eigenbase.sql.validate.SqlValidator, org.eigenbase.sql.validate.SqlValidatorScope); but note that some sub-classes of SqlCall never call this method.

validateCall in class SqlFunction
call - the call to this operator
validator - the active validator
scope - validator scope
operandScope - validator scope in which to validate operands to this call; usually equal to scope, but not always because some operators introduce new scopes
See Also:
SqlNode.validateExpr(SqlValidator, SqlValidatorScope), SqlOperator.deriveType(SqlValidator, SqlValidatorScope, SqlCall)


public void unparse(SqlWriter writer,
                    SqlNode[] operands,
                    int leftPrec,
                    int rightPrec)
Description copied from class: SqlOperator
Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.

The default implementation of this method delegates to SqlSyntax.unparse(org.eigenbase.sql.SqlWriter, org.eigenbase.sql.SqlOperator, org.eigenbase.sql.SqlNode[], int, int).

unparse in class SqlFunction