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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(Table tab,
exprNodeDesc prunerExpr,
HiveConf conf,
String alias,
Map<String,PrunedPartitionList> prunedPartitionsMap)
Get the partition list for the table that satisfies the partition pruner condition. |
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(Table tab, exprNodeDesc prunerExpr, HiveConf conf, String alias, Map<String,PrunedPartitionList> prunedPartitionsMap) throws HiveException
tab
- the table object for the aliasprunerExpr
- the pruner expression for the aliasconf
- for checking whether "strict" mode is on.alias
- for generating error message only.
HiveException
public static boolean hasColumnExpr(exprNodeDesc desc)
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