org.apache.iceberg.expressions

Class Projections.ProjectionEvaluator

java.lang.Object

org.apache.iceberg.expressions.ExpressionVisitors.ExpressionVisitor<Expression>

org.apache.iceberg.expressions.Projections.ProjectionEvaluator

Enclosing class:

Projections

public abstract static class Projections.ProjectionEvaluator
extends ExpressionVisitors.ExpressionVisitor<Expression>

A class that projects expressions for a table's data rows into expressions on the table's partition values, for a table's partition spec.

There are two types of projections: inclusive and strict.

An inclusive projection guarantees that if an expression matches a row, the projected expression will match the row's partition.

A strict projection guarantees that if a partition matches a projected expression, then all rows in that partition will match the original expression.

Constructor Summary

Constructors

Constructor and Description
ProjectionEvaluator()

Method Summary

Modifier and Type	Method and Description
abstract Expression	project(Expression expr) Project the given row expression to a partition expression.

Methods inherited from class org.apache.iceberg.expressions.ExpressionVisitors.ExpressionVisitor

aggregate, aggregate, alwaysFalse, alwaysTrue, and, not, or, predicate, predicate

Methods inherited from class java.lang.Object

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

Constructor Detail

ProjectionEvaluator

public ProjectionEvaluator()

Method Detail

project

public abstract Expression project(Expression expr)

Project the given row expression to a partition expression.

Parameters:

expr - an expression on data rows

Returns:

an expression on partition data (depends on the projection)