Package org.apache.iceberg.expressions
Class Projections.ProjectionEvaluator
- java.lang.Object
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- org.apache.iceberg.expressions.ExpressionVisitors.ExpressionVisitor<Expression>
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- org.apache.iceberg.expressions.Projections.ProjectionEvaluator
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- 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'spartition 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.
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Constructor Summary
Constructors Constructor Description ProjectionEvaluator()
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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
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Method Detail
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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)
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