BaseJoinStrategy (Apache Derby V10.14 Internals)

java.lang.Object
- org.apache.derby.impl.sql.compile.BaseJoinStrategy

All Implemented Interfaces:

JoinStrategy

Direct Known Subclasses:

HashJoinStrategy, NestedLoopJoinStrategy
```
abstract class BaseJoinStrategy
extends java.lang.Object
implements JoinStrategy
```

Constructor Summary

Constructors
Constructor Description

BaseJoinStrategy()

Constructors
Constructor	Description
`BaseJoinStrategy()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`bulkFetchOK()`	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) void`	`fillInScanArgs2(MethodBuilder mb, Optimizable innerTable, int bulkFetch, int colRefItem, int indexColItem, int lockMode, boolean tableLocked, int isolationLevel)`
`boolean`	`ignoreBulkFetch()`	Should we just ignore bulk fetch with this join strategy?
`boolean`	`isHashJoin()`	Is this a form of hash join?
`protected boolean`	`validForOutermostTable()`	Can this join strategy be used on the outermost table of a join.

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

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - BaseJoinStrategy
```
BaseJoinStrategy()
```
- Method Detail
  - bulkFetchOK
```
public boolean bulkFetchOK()
```
    Description copied from interface: JoinStrategy
    
    Is it OK to use bulk fetch with this join strategy?
    
    Specified by:
    
    bulkFetchOK in interface JoinStrategy
    
    See Also:
    
    JoinStrategy.bulkFetchOK()
  - ignoreBulkFetch
```
public boolean ignoreBulkFetch()
```
    Description copied from interface: JoinStrategy
    
    Should we just ignore bulk fetch with this join strategy?
    
    Specified by:
    
    ignoreBulkFetch in interface JoinStrategy
    
    See Also:
    
    JoinStrategy.ignoreBulkFetch()
  - 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
  - fillInScanArgs2
```
final void fillInScanArgs2(MethodBuilder mb,
                           Optimizable innerTable,
                           int bulkFetch,
                           int colRefItem,
                           int indexColItem,
                           int lockMode,
                           boolean tableLocked,
                           int isolationLevel)
                    throws StandardException
```
    Throws:
    
    StandardException
  - isHashJoin
```
public boolean isHashJoin()
```
    Description copied from interface: JoinStrategy
    
    Is this a form of hash join?
    
    Specified by:
    
    isHashJoin in interface JoinStrategy
    
    Returns:
    
    Whether or not this strategy is a form of hash join.
    
    See Also:
    
    JoinStrategy.isHashJoin()
  - 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.

Class BaseJoinStrategy

Constructor Summary

Method Summary

Methods inherited from interface org.apache.derby.iapi.sql.compile.JoinStrategy

Methods inherited from class java.lang.Object

Constructor Detail

BaseJoinStrategy

Method Detail

bulkFetchOK

ignoreBulkFetch

fillInScanArgs1

fillInScanArgs2

isHashJoin

validForOutermostTable