Github user jinfengni commented on a diff in the pull request:
https://github.com/apache/drill/pull/906#discussion_r136157172
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/union/UnionAllRecordBatch.java
---
@@ -130,562 +145,248 @@ public IterOutcome innerNext() {
}
@Override
- public WritableBatch getWritableBatch() {
- return WritableBatch.get(this);
+ public int getRecordCount() {
+ return recordCount;
}
- private void setValueCount(int count) {
- for (ValueVector v : allocationVectors) {
- ValueVector.Mutator m = v.getMutator();
- m.setValueCount(count);
- }
- }
- private boolean doAlloc() {
- for (ValueVector v : allocationVectors) {
- try {
- AllocationHelper.allocateNew(v, current.getRecordCount());
- } catch (OutOfMemoryException ex) {
- return false;
- }
+ @SuppressWarnings("resource")
+ private IterOutcome doWork(RecordBatch inputBatch, boolean newSchema)
throws ClassTransformationException, IOException, SchemaChangeException {
+ if (inputBatch.getSchema().getFieldCount() !=
container.getSchema().getFieldCount()) {
+ // wrong.
}
- return true;
- }
- @SuppressWarnings("resource")
- private IterOutcome doWork() throws ClassTransformationException,
IOException, SchemaChangeException {
- if (allocationVectors != null) {
- for (ValueVector v : allocationVectors) {
- v.clear();
- }
+ if (newSchema) {
+ createUnionAller(inputBatch);
}
- allocationVectors = Lists.newArrayList();
- transfers.clear();
+ container.zeroVectors();
- // If both sides of Union-All are empty
- if(unionAllInput.isBothSideEmpty()) {
- for(int i = 0; i < outputFields.size(); ++i) {
- final String colName = outputFields.get(i).getPath();
- final MajorType majorType = MajorType.newBuilder()
- .setMinorType(MinorType.INT)
- .setMode(DataMode.OPTIONAL)
- .build();
-
- MaterializedField outputField = MaterializedField.create(colName,
majorType);
- ValueVector vv = container.addOrGet(outputField, callBack);
- allocationVectors.add(vv);
- }
+ for (final ValueVector v : this.allocationVectors) {
+ AllocationHelper.allocateNew(v, inputBatch.getRecordCount());
+ }
- container.buildSchema(BatchSchema.SelectionVectorMode.NONE);
+ recordCount = unionall.unionRecords(0, inputBatch.getRecordCount(), 0);
+ for (final ValueVector v : allocationVectors) {
+ final ValueVector.Mutator m = v.getMutator();
+ m.setValueCount(recordCount);
+ }
+
+ if (callBack.getSchemaChangedAndReset()) {
return IterOutcome.OK_NEW_SCHEMA;
+ } else {
+ return IterOutcome.OK;
}
+ }
+
+ private void createUnionAller(RecordBatch inputBatch) throws
ClassTransformationException, IOException, SchemaChangeException {
+ transfers.clear();
+ allocationVectors.clear();;
final ClassGenerator<UnionAller> cg =
CodeGenerator.getRoot(UnionAller.TEMPLATE_DEFINITION,
context.getFunctionRegistry(), context.getOptions());
cg.getCodeGenerator().plainJavaCapable(true);
// Uncomment out this line to debug the generated code.
-// cg.getCodeGenerator().saveCodeForDebugging(true);
+ // cg.getCodeGenerator().saveCodeForDebugging(true);
+
int index = 0;
- for(VectorWrapper<?> vw : current) {
- ValueVector vvIn = vw.getValueVector();
- // get the original input column names
- SchemaPath inputPath =
SchemaPath.getSimplePath(vvIn.getField().getPath());
- // get the renamed column names
- SchemaPath outputPath =
SchemaPath.getSimplePath(outputFields.get(index).getPath());
+ for(VectorWrapper<?> vw : inputBatch) {
+ ValueVector vvIn = vw.getValueVector();
+ ValueVector vvOut = container.getValueVector(index).getValueVector();
final ErrorCollector collector = new ErrorCollectorImpl();
// According to input data names, Minortypes, Datamodes, choose to
// transfer directly,
// rename columns or
// cast data types (Minortype or DataMode)
- if (hasSameTypeAndMode(outputFields.get(index),
vw.getValueVector().getField())) {
+ if (hasSameTypeAndMode(container.getSchema().getColumn(index),
vvIn.getField())
+ && vvIn.getField().getType().getMinorType() !=
TypeProtos.MinorType.MAP // Per DRILL-5521, existing bug for map transfer
+ ) {
// Transfer column
-
- MajorType outputFieldType = outputFields.get(index).getType();
- MaterializedField outputField =
MaterializedField.create(outputPath.getAsUnescapedPath(), outputFieldType);
-
- /*
- todo: Fix if condition when DRILL-4824 is merged
- If condition should be changed to:
- `if
(outputFields.get(index).getPath().equals(inputPath.getAsUnescapedPath())) {`
- DRILL-5419 has changed condition to correct one but this caused
regression (DRILL-5521).
- Root cause is missing indication of child column in map types
when it is null.
- DRILL-4824 is re-working json reader implementation, including
map types and will fix this problem.
- Reverting condition to previous one to avoid regression till
DRILL-4824 is merged.
- Unit test - TestJsonReader.testKvgenWithUnionAll().
- */
- if (outputFields.get(index).getPath().equals(inputPath)) {
- ValueVector vvOut = container.addOrGet(outputField);
- TransferPair tp = vvIn.makeTransferPair(vvOut);
- transfers.add(tp);
+ TransferPair tp = vvIn.makeTransferPair(vvOut);
+ transfers.add(tp);
// Copy data in order to rename the column
- } else {
- final LogicalExpression expr =
ExpressionTreeMaterializer.materialize(inputPath, current, collector,
context.getFunctionRegistry() );
- if (collector.hasErrors()) {
- throw new SchemaChangeException(String.format("Failure while
trying to materialize incoming schema. Errors:\n %s.",
collector.toErrorString()));
- }
-
- ValueVector vv = container.addOrGet(outputField, callBack);
- allocationVectors.add(vv);
- TypedFieldId fid =
container.getValueVectorId(SchemaPath.getSimplePath(outputField.getPath()));
- ValueVectorWriteExpression write = new
ValueVectorWriteExpression(fid, expr, true);
- cg.addExpr(write);
- }
- // Cast is necessary
+ } else if (vvIn.getField().getType().getMinorType() ==
TypeProtos.MinorType.NULL) {
--- End diff --
The comment is for the `else` branch, and should be moved a couple lines
down. For rename a column, I do not think we are doing a copy; transfer should
be good enough.
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