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 Description

ProjectionEvaluator()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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
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)