OpProcFactory (Hive 1.2.2 API)

```
public final class OpProcFactory
extends Object
```
Operator factory for predicate pushdown processing of operator graph Each operator determines the pushdown predicates by walking the expression tree. Each operator merges its own pushdown predicates with those of its children Finally the TableScan operator gathers all the predicates and inserts a filter operator after itself. TODO: Further optimizations 1) Multi-insert case 2) Create a filter operator for those predicates that couldn't be pushed to the previous operators in the data flow 3) Merge multiple sequential filter predicates into so that plans are more readable 4) Remove predicates from filter operators that have been pushed. Currently these pushed predicates are evaluated twice.

Nested Classes
Modifier and Type	Class and Description
`static class`	`OpProcFactory.DefaultPPD` Default processor which just merges its children.
`static class`	`OpProcFactory.FilterPPD` Determines the push down predicates in its where expression and then combines it with the push down predicates that are passed from its children.
`static class`	`OpProcFactory.JoinerPPD` Determines predicates for which alias can be pushed to it's parents.
`static class`	`OpProcFactory.JoinPPD`
`static class`	`OpProcFactory.LateralViewForwardPPD`
`static class`	`OpProcFactory.PTFPPD`
`static class`	`OpProcFactory.ReduceSinkPPD`
`static class`	`OpProcFactory.ScriptPPD` Processor for Script Operator Prevents any predicates being pushed.
`static class`	`OpProcFactory.TableScanPPD` Combines predicates of its child into a single expression and adds a filter op as new child.
`static class`	`OpProcFactory.UDTFPPD`

Fields
Modifier and Type	Field and Description
`protected static org.apache.commons.logging.Log`	`LOG`

Methods
Modifier and Type	Method and Description
`protected static Object`	`createFilter(Operator op, ExprWalkerInfo pushDownPreds, OpWalkerInfo owi)`
`protected static Object`	`createFilter(Operator op, Map<String,List<ExprNodeDesc>> predicates, OpWalkerInfo owi)`
`static NodeProcessor`	`getDefaultProc()`
`static NodeProcessor`	`getFilterProc()`
`static NodeProcessor`	`getJoinProc()`
`static NodeProcessor`	`getLIMProc()`
`static NodeProcessor`	`getLVFProc()`
`static NodeProcessor`	`getLVJProc()`
`static NodeProcessor`	`getPTFProc()`
`static NodeProcessor`	`getRSProc()`
`static NodeProcessor`	`getSCRProc()`
`static NodeProcessor`	`getTSProc()`
`static NodeProcessor`	`getUDTFProc()`

protected static final org.apache.commons.logging.Log LOG

protected static Object createFilter(Operator op,
                  ExprWalkerInfo pushDownPreds,
                  OpWalkerInfo owi)

protected static Object createFilter(Operator op,
                  Map<String,List<ExprNodeDesc>> predicates,
                  OpWalkerInfo owi)

public static NodeProcessor getFilterProc()

public static NodeProcessor getJoinProc()

public static NodeProcessor getTSProc()

public static NodeProcessor getDefaultProc()

public static NodeProcessor getPTFProc()

public static NodeProcessor getSCRProc()

public static NodeProcessor getLIMProc()

public static NodeProcessor getLVFProc()

public static NodeProcessor getUDTFProc()

public static NodeProcessor getLVJProc()

public static NodeProcessor getRSProc()

Class OpProcFactory