Examples with RelationNode org.apache.hyracks.algebricks.examples.piglet.ast.RelationNode used on opensource projects

Example 1 with RelationNode

use of org.apache.hyracks.algebricks.examples.piglet.ast.RelationNode in project asterixdb by apache.

the class PigletCompiler method translate.

private ILogicalPlan translate(List<ASTNode> ast) throws PigletException {
    Map<String, Relation> symMap = new HashMap<String, Relation>();
    List<Mutable<ILogicalOperator>> roots = new ArrayList<Mutable<ILogicalOperator>>();
    previousOp = null;
    for (ASTNode an : ast) {
        switch(an.getTag()) {
            case DUMP:
                {
                    DumpNode dn = (DumpNode) an;
                    Relation input = symMap.get(dn.getAlias());
                    List<Mutable<ILogicalExpression>> expressions = new ArrayList<Mutable<ILogicalExpression>>();
                    for (LogicalVariable v : input.schema.values()) {
                        expressions.add(new MutableObject<ILogicalExpression>(new VariableReferenceExpression(v)));
                    }
                    PigletFileDataSink dataSink = new PigletFileDataSink(dn.getFile());
                    ILogicalOperator op = new WriteOperator(expressions, dataSink);
                    op.getInputs().add(new MutableObject<ILogicalOperator>(input.op));
                    roots.add(new MutableObject<ILogicalOperator>(op));
                }
                break;
            case ASSIGNMENT:
                {
                    AssignmentNode asn = (AssignmentNode) an;
                    String alias = asn.getAlias();
                    RelationNode rn = asn.getRelation();
                    Relation rel = translate(rn, symMap);
                    previousOp = rel.op;
                    rel.alias = alias;
                    symMap.put(alias, rel);
                }
                break;
        }
    }
    return new ALogicalPlanImpl(roots);
}