String name = result.outputNames.get(k++); // get the renamed column names
if (name == EMPTY_STRING) continue;
final LogicalExpression expr = ExpressionTreeMaterializer.materialize(originalPath, incoming, collector, context.getFunctionRegistry() );
if(collector.hasErrors()){
throw new SchemaChangeException(String.format("Failure while trying to materialize incoming schema. Errors:\n %s.", collector.toErrorString()));
}
MaterializedField outputField = MaterializedField.create(name, expr.getMajorType());
ValueVector vv = TypeHelper.getNewVector(outputField, oContext.getAllocator());
allocationVectors.add(vv);
TypedFieldId fid = container.add(vv);
ValueVectorWriteExpression write = new ValueVectorWriteExpression(fid, expr, true);
HoldingContainer hc = cg.addExpr(write);
cg.getEvalBlock()._if(hc.getValue().eq(JExpr.lit(0)))._then()._return(JExpr.FALSE);
}
}
continue;
}
}
String outputName = getRef(namedExpression).getRootSegment().getPath();
if (result != null && result.outputNames != null && result.outputNames.size() > 0) {
if (result.outputNames.get(0) == EMPTY_STRING) continue;
outputName = result.outputNames.get(0);
}
final LogicalExpression expr = ExpressionTreeMaterializer.materialize(namedExpression.getExpr(), incoming, collector, context.getFunctionRegistry(), true);
final MaterializedField outputField = MaterializedField.create(outputName, expr.getMajorType());
if(collector.hasErrors()){
throw new SchemaChangeException(String.format("Failure while trying to materialize incoming schema. Errors:\n %s.", collector.toErrorString()));
}
// add value vector to transfer if direct reference and this is allowed, otherwise, add to evaluation stack.
if(expr instanceof ValueVectorReadExpression && incoming.getSchema().getSelectionVectorMode() == SelectionVectorMode.NONE
&& !((ValueVectorReadExpression) expr).hasReadPath()
&& !isAnyWildcard
&& !transferFieldIds.contains(((ValueVectorReadExpression) expr).getFieldId().getFieldIds()[0])
) {
ValueVectorReadExpression vectorRead = (ValueVectorReadExpression) expr;
TypedFieldId id = vectorRead.getFieldId();
ValueVector vvIn = incoming.getValueAccessorById(id.getIntermediateClass(), id.getFieldIds()).getValueVector();
Preconditions.checkNotNull(incoming);
TransferPair tp = vvIn.getTransferPair(getRef(namedExpression));
transfers.add(tp);
container.add(tp.getTo());
transferFieldIds.add(vectorRead.getFieldId().getFieldIds()[0]);
logger.debug("Added transfer for project expression.");
} else if (expr instanceof DrillFuncHolderExpr &&
((DrillFuncHolderExpr) expr).isComplexWriterFuncHolder()) {
// Need to process ComplexWriter function evaluation.
// Lazy initialization of the list of complex writers, if not done yet.
if (complexWriters == null)
complexWriters = Lists.newArrayList();
// The reference name will be passed to ComplexWriter, used as the name of the output vector from the writer.
((DrillComplexWriterFuncHolder) ((DrillFuncHolderExpr) expr).getHolder()).setReference(namedExpression.getRef());
cg.addExpr(expr);
} else{
// need to do evaluation.
ValueVector vector = TypeHelper.getNewVector(outputField, oContext.getAllocator());
allocationVectors.add(vector);
TypedFieldId fid = container.add(vector);
ValueVectorWriteExpression write = new ValueVectorWriteExpression(fid, expr, true);
HoldingContainer hc = cg.addExpr(write);
cg.getEvalBlock()._if(hc.getValue().eq(JExpr.lit(0)))._then()._return(JExpr.FALSE);
logger.debug("Added eval for project expression.");
}
}
cg.rotateBlock();
cg.getEvalBlock()._return(JExpr.TRUE);
container.buildSchema(SelectionVectorMode.NONE);
try {
this.projector = context.getImplementationClass(cg.getCodeGenerator());
projector.setup(context, incoming, this, transfers);
} catch (ClassTransformationException | IOException e) {
throw new SchemaChangeException("Failure while attempting to load generated class", e);
}
}