if( sink instanceof ProjectExpression ) {
ProjectExpression projExpr = (ProjectExpression)sink;
String colAlias = projExpr.getColAlias();
if( projExpr.isRangeProject()){
LOInnerLoad innerLoad = new LOInnerLoad( lp, foreach,
new ProjectExpression(projExpr, new LogicalExpressionPlan())
);
setupInnerLoadAndProj(innerLoad, projExpr, lp, inputs);
}
else if( colAlias != null ) {
// the project is using a column alias
Operator op = operators.get( colAlias );
if( op != null ) {
// this means the project expression refers to a relation
// in the nested foreach
//add the relation to inputs of LOGenerate and set
// projection input
int index = inputs.indexOf( op );
if( index == -1 ) {
index = inputs.size();
inputs.add( op );
}
projExpr.setInputNum( index );
projExpr.setColNum( -1 );
} else {
// this means the project expression refers to a column
// in the input of foreach. Add a LOInnerLoad and use that
// as input
LOInnerLoad innerLoad = new LOInnerLoad( lp, foreach, colAlias );
setupInnerLoadAndProj(innerLoad, projExpr, lp, inputs);
}
} else {
// the project expression is referring to column in ForEach input
// using position (eg $1)
LOInnerLoad innerLoad = new LOInnerLoad( lp, foreach, projExpr.getColNum() );
setupInnerLoadAndProj(innerLoad, projExpr, lp, inputs);
}
}
}
}