org.apache.hadoop.hive.ql.io.sarg

Interface SearchArgument

All Known Implementing Classes:

SearchArgumentImpl

public interface SearchArgument

Primary interface for SearchArgument, which are the subset of predicates that can be pushed down to the RecordReader. Each SearchArgument consists of a series of SearchClauses that must each be true for the row to be accepted by the filter. This requires that the filter be normalized into conjunctive normal form (CNF).

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	SearchArgument.Builder A builder object for contexts outside of Hive where it isn't easy to get a ExprNodeDesc.
static class	SearchArgument.TruthValue The potential result sets of logical operations.

Method Summary

Modifier and Type	Method and Description
SearchArgument.TruthValue	evaluate(SearchArgument.TruthValue[] leaves) Evaluate the entire predicate based on the values for the leaf predicates.
ExpressionTree	getExpression() Get the expression tree.
List<PredicateLeaf>	getLeaves() Get the leaf predicates that are required to evaluate the predicate.

Method Detail

getLeaves

List<PredicateLeaf> getLeaves()

Get the leaf predicates that are required to evaluate the predicate. The list will have the duplicates removed.

Returns:

the list of leaf predicates

getExpression

ExpressionTree getExpression()

Get the expression tree. This should only needed for file formats that need to translate the expression to an internal form.

evaluate

SearchArgument.TruthValue evaluate(SearchArgument.TruthValue[] leaves)

Evaluate the entire predicate based on the values for the leaf predicates.

Parameters:

leaves - the value of each leaf predicate

Returns:

the value of hte entire predicate