org.eigenbase.sql
Class SqlJoinOperator

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

public class SqlJoinOperator
extends SqlOperator

SqlJoinOperator describes the syntax of the SQL JOIN operator. Since there is only one such operator, this class is almost certainly a singleton.

Since:

Mar 19, 2003

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/SqlJoinOperator.java#20 $

Author:

jhyde

Nested Class Summary

static class	SqlJoinOperator.ConditionType Enumerates the types of condition in a join expression.
static class	SqlJoinOperator.JoinType Enumerates the types of join.

Field Summary

private static SqlWriter.FrameType

UsingFrameType

Fields inherited from class org.eigenbase.sql.SqlOperator

MaxPrec, NL

Constructor Summary

SqlJoinOperator()

Method Summary

SqlCall	createCall(SqlLiteral functionQualifier, SqlParserPos pos, SqlNode... operands) Creates a call to this operand with an array of operands.
SqlCall	createCall(SqlNode left, SqlLiteral isNatural, SqlLiteral joinType, SqlNode right, SqlLiteral conditionType, SqlNode condition, SqlParserPos pos)
SqlSyntax	getSyntax() Returns the syntactic type of this operator.
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.

Methods inherited from class org.eigenbase.sql.SqlOperator

acceptCall, acceptCall, adjustType, argumentMustBeScalar, checkOperandCount, checkOperandTypes, createCall, createCall, createCall, deriveType, 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, validateCall, validateOperands

Methods inherited from class java.lang.Object

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

Field Detail

UsingFrameType

private static final SqlWriter.FrameType UsingFrameType

Constructor Detail

SqlJoinOperator

public SqlJoinOperator()

Method Detail

getSyntax

public SqlSyntax getSyntax()

Description copied from class: SqlOperator

Returns the syntactic type of this operator.

Specified by:

getSyntax in class SqlOperator

createCall

public SqlCall createCall(SqlLiteral functionQualifier,
                          SqlParserPos pos,
                          SqlNode... operands)

Description copied from class: SqlOperator

Creates a call to this operand with an array of operands.

The position of the resulting call is the union of the pos and the positions of all of the operands.

Overrides:

createCall in class SqlOperator

Parameters:

functionQualifier - function qualifier (e.g. "DISTINCT"), may be

pos - parser position of the identifier of the call

operands - array of operands

createCall

public SqlCall createCall(SqlNode left,
                          SqlLiteral isNatural,
                          SqlLiteral joinType,
                          SqlNode right,
                          SqlLiteral conditionType,
                          SqlNode condition,
                          SqlParserPos pos)

unparse

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).

Overrides:

unparse in class SqlOperator