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java.lang.Object org.apache.hadoop.hive.ql.ppd.ExprWalkerProcFactory
public final class ExprWalkerProcFactory
Expression factory for predicate pushdown processing. Each processor determines whether the expression is a possible candidate for predicate pushdown optimization for the given operator
Nested Class Summary | |
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static class |
ExprWalkerProcFactory.ColumnExprProcessor
ColumnExprProcessor. |
static class |
ExprWalkerProcFactory.DefaultExprProcessor
For constants and null expressions. |
static class |
ExprWalkerProcFactory.FieldExprProcessor
FieldExprProcessor. |
static class |
ExprWalkerProcFactory.GenericFuncExprProcessor
If all children are candidates and refer only to one table alias then this expr is a candidate else it is not a candidate but its children could be final candidates. |
Method Summary | |
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static ExprWalkerInfo |
extractPushdownPreds(OpWalkerInfo opContext,
Operator<? extends OperatorDesc> op,
ExprNodeDesc pred)
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static ExprWalkerInfo |
extractPushdownPreds(OpWalkerInfo opContext,
Operator<? extends OperatorDesc> op,
List<ExprNodeDesc> preds)
Extracts pushdown predicates from the given list of predicate expression. |
static NodeProcessor |
getColumnProcessor()
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static NodeProcessor |
getDefaultExprProcessor()
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static NodeProcessor |
getGenericFuncProcessor()
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Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Method Detail |
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public static NodeProcessor getDefaultExprProcessor()
public static NodeProcessor getGenericFuncProcessor()
public static NodeProcessor getColumnProcessor()
public static ExprWalkerInfo extractPushdownPreds(OpWalkerInfo opContext, Operator<? extends OperatorDesc> op, ExprNodeDesc pred) throws SemanticException
SemanticException
public static ExprWalkerInfo extractPushdownPreds(OpWalkerInfo opContext, Operator<? extends OperatorDesc> op, List<ExprNodeDesc> preds) throws SemanticException
opContext
- operator context used for resolving column referencesop
- operator of the predicates being processedpreds
-
SemanticException
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