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6 changes: 6 additions & 0 deletions core/src/main/java/io/substrait/relation/AbstractReadRel.java
Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,12 @@ public abstract class AbstractReadRel extends ZeroInputRel implements HasExtensi
*/
public abstract Optional<Expression> getBestEffortFilter();

/**
* Returns the projection mask expression for this read relation.
*
* @return an Optional containing the MaskExpression if present, or empty if no projection is
* specified
*/
public abstract Optional<MaskExpression> getProjection();

@Override
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