Examples of BagDereferenceExpression

org.apache.pig.experimental.logical.expression.BagDereferenceExpression
This is a special case Expression and violates some of the rules of an Expression. Violation: It has multiple Uids ( though not tracked there can be multiple uids for this expression ) This is a special operator which handles the case described below Tuple( a:int, b:bag{ b_a:int, b_b:float } ) --> BagDereference ( 0 ) --> project( 0, 1 ) --> bag{ b_a:float } i.e. First input ( 0 ), second column ( 1 ) and first column of the bag.

Examples of org.apache.pig.experimental.logical.expression.BagDereferenceExpression

            // Here we merge these two projects into one BagDereferenceExpression
            if( op instanceof LOProject ) {
                ProjectExpression projectExp = (ProjectExpression) exprOpsMap.get(op);
                
                // Add the bag in the plan
                BagDereferenceExpression bagDR = new BagDereferenceExpression( 
                        exprPlan, project.getType(), project.getProjection(), projectExp);                
                exprOpsMap.put(project, bagDR);
                                
                translateConnection( project, bagDR );                
            }

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