Package 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 Details

    • ProjectionEvaluator

      public ProjectionEvaluator()

  • Method Details

    • 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)