Package org.apache.calcite.rex

Class LogicVisitor

java.lang.Object

org.apache.calcite.rex.RexBiVisitorImpl<R,R>

org.apache.calcite.rex.RexUnaryBiVisitor<@Nullable RelOptUtil.Logic>

org.apache.calcite.rex.LogicVisitor

All Implemented Interfaces:

RexBiVisitor<RelOptUtil.Logic,RelOptUtil.Logic>

public class LogicVisitor
extends RexUnaryBiVisitor<@Nullable RelOptUtil.Logic>

Visitor pattern for traversing a tree of RexNode objects.

Field Summary

Fields inherited from class org.apache.calcite.rex.RexBiVisitorImpl

deep

Method Summary

Modifier and Type	Method	Description
static void	collect(RexNode node, RexNode seek, RelOptUtil.Logic logic, List<RelOptUtil.Logic> logicList)
protected @Nullable RelOptUtil.Logic	end(RexNode node, @Nullable RelOptUtil.Logic arg)	Called as the last action of, and providing the result for, each visitXxx method; derived classes may override.
static RelOptUtil.Logic	find(RelOptUtil.Logic logic, List<RexNode> nodes, RexNode seek)	Finds a suitable logic for evaluating seek within a list of expressions.
@Nullable RelOptUtil.Logic	visitCall(RexCall call, @Nullable RelOptUtil.Logic logic)
@Nullable RelOptUtil.Logic	visitFieldAccess(RexFieldAccess fieldAccess, @Nullable RelOptUtil.Logic arg)
@Nullable RelOptUtil.Logic	visitOver(RexOver over, @Nullable RelOptUtil.Logic arg)
@Nullable RelOptUtil.Logic	visitSubQuery(RexSubQuery subQuery, @Nullable RelOptUtil.Logic arg)

Methods inherited from class org.apache.calcite.rex.RexUnaryBiVisitor

visitCorrelVariable, visitDynamicParam, visitInputRef, visitLiteral, visitLocalRef, visitPatternFieldRef, visitRangeRef, visitTableInputRef

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.calcite.rex.RexBiVisitor

visitEach, visitEachIndexed, visitList, visitList

Method Details

find

public static RelOptUtil.Logic find(RelOptUtil.Logic logic,
 List<RexNode> nodes,
 RexNode seek)

Finds a suitable logic for evaluating seek within a list of expressions.

Chooses a logic that is safe (that is, gives the right answer) with the fewest possibilities (that is, we prefer one that returns [true as true, false as false, unknown as false] over one that distinguishes false from unknown).

collect

public static void collect(RexNode node,
 RexNode seek,
 RelOptUtil.Logic logic,
 List<RelOptUtil.Logic> logicList)

visitCall

public @Nullable RelOptUtil.Logic visitCall(RexCall call,
 @Nullable RelOptUtil.Logic logic)

Specified by:

visitCall in interface RexBiVisitor<RelOptUtil.Logic,RelOptUtil.Logic>

Overrides:

visitCall in class RexUnaryBiVisitor<@Nullable RelOptUtil.Logic>

end

protected @Nullable RelOptUtil.Logic end(RexNode node,
 @Nullable RelOptUtil.Logic arg)

Description copied from class: RexUnaryBiVisitor

Called as the last action of, and providing the result for, each visitXxx method; derived classes may override.

Overrides:

end in class RexUnaryBiVisitor<@Nullable RelOptUtil.Logic>

visitOver

public @Nullable RelOptUtil.Logic visitOver(RexOver over,
 @Nullable RelOptUtil.Logic arg)

Specified by:

visitOver in interface RexBiVisitor<RelOptUtil.Logic,RelOptUtil.Logic>

Overrides:

visitOver in class RexUnaryBiVisitor<@Nullable RelOptUtil.Logic>

visitFieldAccess

public @Nullable RelOptUtil.Logic visitFieldAccess(RexFieldAccess fieldAccess,
 @Nullable RelOptUtil.Logic arg)

Specified by:

visitFieldAccess in interface RexBiVisitor<RelOptUtil.Logic,RelOptUtil.Logic>

Overrides:

visitFieldAccess in class RexUnaryBiVisitor<@Nullable RelOptUtil.Logic>

visitSubQuery

public @Nullable RelOptUtil.Logic visitSubQuery(RexSubQuery subQuery,
 @Nullable RelOptUtil.Logic arg)

Specified by:

visitSubQuery in interface RexBiVisitor<RelOptUtil.Logic,RelOptUtil.Logic>

Overrides:

visitSubQuery in class RexUnaryBiVisitor<@Nullable RelOptUtil.Logic>