net.sf.farrago.query
Class FarragoReentrantStmtExecutor

java.lang.Object
  net.sf.farrago.query.FarragoReentrantStmt
      net.sf.farrago.query.FarragoReentrantStmtExecutor

Direct Known Subclasses:

FarragoReduceExpressionsRule.ReentrantValuesStmt, FarragoReentrantSubquery

public abstract class FarragoReentrantStmtExecutor
extends FarragoReentrantStmt

FarragoReentrantStmtExecutor extends FarragoReentrantStmt by providing a base method for executing a query plan and returning its result.

Version:

$Id: //open/dev/farrago/src/net/sf/farrago/query/FarragoReentrantStmtExecutor.java#4 $

Author:

John V. Sichi

Field Summary

protected boolean	failed
protected List<RexNode>	results
protected RexBuilder	rexBuilder
private static Logger	tracer

Constructor Summary

FarragoReentrantStmtExecutor(FarragoSessionStmtContext rootStmtContext, RexBuilder rexBuilder, List<RexNode> results)
Constructs a FarragoReentrantStmtExecutor.

Method Summary

private SqlTypeName	broadenType(SqlTypeName typeName)
protected void	executePlan(RelNode plan, List<RexNode> exprs, boolean isExists, boolean excludeReduceExprRule) Executes a query given a plan containing the corresponding RelNode tree.
private void	getResultRow(List<RexNode> exprs, ResultSet resultSet)

Methods inherited from class net.sf.farrago.query.FarragoReentrantStmt

execute, executeImpl, getPreparingStmt, getRootStmtContext, getStmtContext

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

tracer

private static final Logger tracer

rexBuilder

protected final RexBuilder rexBuilder

results

protected final List<RexNode> results

failed

protected boolean failed

Constructor Detail

FarragoReentrantStmtExecutor

FarragoReentrantStmtExecutor(FarragoSessionStmtContext rootStmtContext,
                             RexBuilder rexBuilder,
                             List<RexNode> results)

Constructs a FarragoReentrantStmtExecutor.

Parameters:

rootStmtContext - statement context for the root statement of this reentrant statement

rexBuilder - rex builder

results - the resulting evaluated expressions

Method Detail

executePlan

protected void executePlan(RelNode plan,
                           List<RexNode> exprs,
                           boolean isExists,
                           boolean excludeReduceExprRule)
                    throws Exception

Executes a query given a plan containing the corresponding RelNode tree.

Parameters:

plan - the query to be executed

exprs - list of expressions that will be evaluated

isExists - whether the query being executed is part of an EXISTS expression; in this case, the result is either a TRUE or FALSE boolean literal, depending on whether the query returns zero or at least one row

excludeReduceExprRule - true if this execution is already being done to reduce individual expressions

Throws:

Exception

getResultRow

private void getResultRow(List<RexNode> exprs,
                          ResultSet resultSet)
                   throws Exception

Throws:

Exception

broadenType

private SqlTypeName broadenType(SqlTypeName typeName)