Class BaseJoinStrategy
java.lang.Object
org.apache.derby.impl.sql.compile.BaseJoinStrategy
- All Implemented Interfaces:
JoinStrategy
- Direct Known Subclasses:
HashJoinStrategy
,NestedLoopJoinStrategy
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionboolean
Is it OK to use bulk fetch with this join strategy?(package private) void
fillInScanArgs1
(TransactionController tc, MethodBuilder mb, Optimizable innerTable, OptimizablePredicateList predList, ExpressionClassBuilderInterface acbi, int resultRowTemplate) Push the first set of common arguments for obtaining a scan ResultSet from ResultSetFactory.(package private) final void
fillInScanArgs2
(MethodBuilder mb, Optimizable innerTable, int bulkFetch, int colRefItem, int indexColItem, int lockMode, boolean tableLocked, int isolationLevel) boolean
Should we just ignore bulk fetch with this join strategy?boolean
Is this a form of hash join?protected boolean
Can this join strategy be used on the outermost table of a join.Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface org.apache.derby.iapi.sql.compile.JoinStrategy
divideUpPredicateLists, doesMaterialization, estimateCost, feasible, getBasePredicates, getName, getOperatorSymbol, getScanArgs, halfOuterJoinResultSetMethodName, joinResultSetMethodName, maxCapacity, multiplyBaseCostByOuterRows, nonBasePredicateSelectivity, putBasePredicates, resultSetMethodName, scanCostType
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Constructor Details
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BaseJoinStrategy
BaseJoinStrategy()
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Method Details
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bulkFetchOK
public boolean bulkFetchOK()Description copied from interface:JoinStrategy
Is it OK to use bulk fetch with this join strategy?- Specified by:
bulkFetchOK
in interfaceJoinStrategy
- See Also:
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ignoreBulkFetch
public boolean ignoreBulkFetch()Description copied from interface:JoinStrategy
Should we just ignore bulk fetch with this join strategy?- Specified by:
ignoreBulkFetch
in interfaceJoinStrategy
- See Also:
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fillInScanArgs1
void fillInScanArgs1(TransactionController tc, MethodBuilder mb, Optimizable innerTable, OptimizablePredicateList predList, ExpressionClassBuilderInterface acbi, int resultRowTemplate) throws StandardException Push the first set of common arguments for obtaining a scan ResultSet from ResultSetFactory. The first 11 arguments are common for these ResultSet getters- ResultSetFactory.getBulkTableScanResultSet
- ResultSetFactory.getHashScanResultSet
- ResultSetFactory.getTableScanResultSet
- ResultSetFactory.getRaDependentTableScanResultSet
- Parameters:
tc
-mb
-innerTable
-predList
-acbi
-- Throws:
StandardException
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fillInScanArgs2
final void fillInScanArgs2(MethodBuilder mb, Optimizable innerTable, int bulkFetch, int colRefItem, int indexColItem, int lockMode, boolean tableLocked, int isolationLevel) throws StandardException - Throws:
StandardException
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isHashJoin
public boolean isHashJoin()Description copied from interface:JoinStrategy
Is this a form of hash join?- Specified by:
isHashJoin
in interfaceJoinStrategy
- Returns:
- Whether or not this strategy is a form of hash join.
- See Also:
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validForOutermostTable
protected boolean validForOutermostTable()Can this join strategy be used on the outermost table of a join.- Returns:
- Whether or not this join strategy can be used on the outermost table of a join.
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