com.mapr.ojai.store.impl

Class RelationalOperator

java.lang.Object

com.mapr.ojai.store.impl.Expression

com.mapr.ojai.store.impl.OperatorExpression

com.mapr.ojai.store.impl.NaryOperator

com.mapr.ojai.store.impl.RelationalOperator

public class RelationalOperator
extends NaryOperator

Tag an NaryOperator as being a special case: a relational operator that is invertible.

Field Summary

Fields inherited from class com.mapr.ojai.store.impl.NaryOperator

arg, isPrefix

Fields inherited from class com.mapr.ojai.store.impl.OperatorExpression

opName

Constructor Summary

Constructors

Constructor and Description
RelationalOperator(java.lang.String opName, java.util.List<Expression> arg) Constructor.

Method Summary

Modifier and Type	Method and Description
void	emitSql(java.lang.StringBuilder sb, java.lang.String tableAlias) Emit this expression's contribution to the string (where clause).
void	gatherExpressions(int depth, java.util.Map<org.ojai.FieldPath,java.util.List<NaryOperator>> topRelations, java.util.Set<Expression> otherPredicates) TODO: doc
org.ojai.FieldPath	getLeftField() Get the field path in the left operand.
LiteralExpression	getRightLiteral() Get the literal in the right operand.
void	visit(ExpressionVisitor ev) Visit this node.

Methods inherited from class com.mapr.ojai.store.impl.NaryOperator

addTopRelation, isLogicalOperator, structuralEquals, structuralHashCode, toQueryCondition

Methods inherited from class com.mapr.ojai.store.impl.Expression

toString

Methods inherited from class java.lang.Object

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

Constructor Detail

RelationalOperator

public RelationalOperator(java.lang.String opName,
                          java.util.List<Expression> arg)

Constructor.

Parameters:

opName - name of operator

arg - argument list

Method Detail

gatherExpressions

public void gatherExpressions(int depth,
                              java.util.Map<org.ojai.FieldPath,java.util.List<NaryOperator>> topRelations,
                              java.util.Set<Expression> otherPredicates)

Description copied from class: Expression

TODO: doc

Overrides:

gatherExpressions in class NaryOperator

emitSql

public void emitSql(java.lang.StringBuilder sb,
                    java.lang.String tableAlias)

Description copied from class: Expression

Emit this expression's contribution to the string (where clause).

Overrides:

emitSql in class NaryOperator

Parameters:

sb - where to write to

tableAlias - the table alias to use for field names

getLeftField

public org.ojai.FieldPath getLeftField()

Get the field path in the left operand.

Returns:

the field path

getRightLiteral

public LiteralExpression getRightLiteral()

Get the literal in the right operand.

Returns:

the literal

visit

public void visit(ExpressionVisitor ev)

Description copied from class: Expression

Visit this node. For nodes that have children, this will be expected to visit those in post-order.

Overrides:

visit in class NaryOperator

Parameters:

ev - the visitor