org.tikv.common.expression.visitor

类 PrunedPartitionBuilder

java.lang.Object

org.tikv.common.expression.Visitor<R,C>

org.tikv.common.expression.visitor.DefaultVisitor<com.google.common.collect.RangeSet<C>,Void>

org.tikv.common.expression.visitor.RangeSetBuilder<TypedKey>

org.tikv.common.expression.visitor.PrunedPartitionBuilder

public class PrunedPartitionBuilder
extends RangeSetBuilder<TypedKey>

Apply partition pruning rule on filter condition. Partition pruning is based on a simple idea and can be described as "Do not scan partitions where there can be no matching values". Currently only range partition pruning is supported(range column on multiple columns is not supported at TiDB side, so we can't optimize this yet).

构造器概要

构造器

构造器和说明
PrunedPartitionBuilder(Set<ColumnRef> partExprColRefs)

方法概要

限定符和类型	方法和说明
protected com.google.common.collect.RangeSet<TypedKey>	process(Expression node, Void context)
protected com.google.common.collect.RangeSet<TypedKey>	visit(ComparisonBinaryExpression node, Void context)
protected com.google.common.collect.RangeSet<TypedKey>	visit(Constant node, Void context)

从类继承的方法 org.tikv.common.expression.visitor.RangeSetBuilder

buildRange, visit

从类继承的方法 org.tikv.common.expression.visitor.DefaultVisitor

visit, visit, visit, visit, visit, visit, visit

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

PrunedPartitionBuilder

public PrunedPartitionBuilder(Set<ColumnRef> partExprColRefs)

方法详细资料

process

protected com.google.common.collect.RangeSet<TypedKey> process(Expression node,
                                                               Void context)

覆盖:

process 在类中 RangeSetBuilder<TypedKey>

visit

protected com.google.common.collect.RangeSet<TypedKey> visit(Constant node,
                                                             Void context)

覆盖:

visit 在类中 DefaultVisitor<com.google.common.collect.RangeSet<TypedKey>,Void>

visit

protected com.google.common.collect.RangeSet<TypedKey> visit(ComparisonBinaryExpression node,
                                                             Void context)

覆盖:

visit 在类中 DefaultVisitor<com.google.common.collect.RangeSet<TypedKey>,Void>