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java.lang.Objectorg.apache.hadoop.hive.ql.optimizer.ppr.PartitionPruner
public class PartitionPruner
The transformation step that does partition pruning.
Constructor Summary | |
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PartitionPruner()
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Method Summary | |
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static boolean |
hasColumnExpr(ExprNodeDesc desc)
Whether the expression contains a column node or not. |
static boolean |
onlyContainsPartnCols(Table tab,
ExprNodeDesc expr)
Find out whether the condition only contains partitioned columns. |
static PrunedPartitionList |
prune(TableScanOperator ts,
ParseContext parseCtx,
String alias)
Get the partition list for the TS operator that satisfies the partition pruner condition. |
static boolean |
prunePartitionNames(List<String> columnNames,
ExprNodeDesc prunerExpr,
String defaultPartitionName,
List<String> partNames)
Prunes partition names to see if they match the prune expression. |
ParseContext |
transform(ParseContext pctx)
All transformation steps implement this interface. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public PartitionPruner()
Method Detail |
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public ParseContext transform(ParseContext pctx) throws SemanticException
Transform
transform
in interface Transform
pctx
- input parse context
SemanticException
public static boolean onlyContainsPartnCols(Table tab, ExprNodeDesc expr)
tab
- the table objectexpr
- the pruner expression for the tablepublic static PrunedPartitionList prune(TableScanOperator ts, ParseContext parseCtx, String alias) throws HiveException
HiveException
public static boolean prunePartitionNames(List<String> columnNames, ExprNodeDesc prunerExpr, String defaultPartitionName, List<String> partNames) throws HiveException, MetaException
columnNames
- name of partition columnsprunerExpr
- The expression to match.defaultPartitionName
- name of default partitionpartNames
- Partition names to filter. The list is modified in place.
HiveException
MetaException
public static boolean hasColumnExpr(ExprNodeDesc desc)
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