Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/906#discussion_r136440319
--- 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) {
+ continue;
} else {
- LogicalExpression expr =
ExpressionTreeMaterializer.materialize(inputPath, current, collector,
context.getFunctionRegistry());
+ SchemaPath inputPath =
SchemaPath.getSimplePath(vvIn.getField().getPath());
+ MaterializedField inField = vvIn.getField();
+ MaterializedField outputField = vvOut.getField();
+
+ LogicalExpression expr =
ExpressionTreeMaterializer.materialize(inputPath, inputBatch, collector,
context.getFunctionRegistry());
+
if (collector.hasErrors()) {
throw new SchemaChangeException(String.format("Failure while
trying to materialize incoming schema. Errors:\n %s.",
collector.toErrorString()));
}
// If the inputs' DataMode is required and the outputs' DataMode
is not required
// cast to the one with the least restriction
- if(vvIn.getField().getType().getMode() == DataMode.REQUIRED
- && outputFields.get(index).getType().getMode() !=
DataMode.REQUIRED) {
- expr = ExpressionTreeMaterializer.convertToNullableType(expr,
vvIn.getField().getType().getMinorType(), context.getFunctionRegistry(),
collector);
+ if(inField.getType().getMode() == TypeProtos.DataMode.REQUIRED
+ && outputField.getType().getMode() !=
TypeProtos.DataMode.REQUIRED) {
+ expr = ExpressionTreeMaterializer.convertToNullableType(expr,
inField.getType().getMinorType(), context.getFunctionRegistry(), collector);
if (collector.hasErrors()) {
throw new SchemaChangeException(String.format("Failure while
trying to materialize incoming schema. Errors:\n %s.",
collector.toErrorString()));
}
}
// If two inputs' MinorTypes are different,
// Insert a cast before the Union operation
- if(vvIn.getField().getType().getMinorType() !=
outputFields.get(index).getType().getMinorType()) {
- expr = ExpressionTreeMaterializer.addCastExpression(expr,
outputFields.get(index).getType(), context.getFunctionRegistry(), collector);
+ if(inField.getType().getMinorType() !=
outputField.getType().getMinorType()) {
+ expr = ExpressionTreeMaterializer.addCastExpression(expr,
outputField.getType(), context.getFunctionRegistry(), collector);
if (collector.hasErrors()) {
throw new SchemaChangeException(String.format("Failure while
trying to materialize incoming schema. Errors:\n %s.",
collector.toErrorString()));
}
}
- final MaterializedField outputField =
MaterializedField.create(outputPath.getAsUnescapedPath(), expr.getMajorType());
- ValueVector vector = container.addOrGet(outputField, callBack);
- allocationVectors.add(vector);
TypedFieldId fid =
container.getValueVectorId(SchemaPath.getSimplePath(outputField.getPath()));
- boolean useSetSafe = !(vector instanceof FixedWidthVector);
+ boolean useSetSafe = !(vvOut instanceof FixedWidthVector);
ValueVectorWriteExpression write = new
ValueVectorWriteExpression(fid, expr, useSetSafe);
cg.addExpr(write);
+
+ allocationVectors.add(vvOut);
}
++index;
}
unionall = context.getImplementationClass(cg.getCodeGenerator());
- unionall.setup(context, current, this, transfers);
-
- if(!schemaAvailable) {
- container.buildSchema(BatchSchema.SelectionVectorMode.NONE);
- schemaAvailable = true;
- }
-
- if(!doAlloc()) {
- return IterOutcome.OUT_OF_MEMORY;
- }
-
- recordCount = unionall.unionRecords(0, current.getRecordCount(), 0);
- setValueCount(recordCount);
- return IterOutcome.OK;
- }
-
- public static boolean hasSameTypeAndMode(MaterializedField leftField,
MaterializedField rightField) {
- return (leftField.getType().getMinorType() ==
rightField.getType().getMinorType())
- && (leftField.getType().getMode() ==
rightField.getType().getMode());
- }
-
- // This method is used by inner class to point the reference `current`
to the correct record batch
- private void setCurrentRecordBatch(RecordBatch target) {
- this.current = target;
- }
-
- // This method is used by inner class to clear the current record batch
- private void clearCurrentRecordBatch() {
- for(VectorWrapper<?> v: current) {
- v.clear();
- }
+ unionall.setup(context, inputBatch, this, transfers);
}
- public static class UnionAllInput {
- private UnionAllRecordBatch unionAllRecordBatch;
- private List<MaterializedField> outputFields;
- private OneSideInput leftSide;
- private OneSideInput rightSide;
- private IterOutcome upstream = IterOutcome.NOT_YET;
- private boolean leftIsFinish = false;
- private boolean rightIsFinish = false;
-
- // These two schemas are obtained from the first record batches of the
left and right inputs
- // They are used to check if the schema is changed between
recordbatches
- private BatchSchema leftSchema;
- private BatchSchema rightSchema;
- private boolean bothEmpty = false;
-
- public UnionAllInput(UnionAllRecordBatch unionAllRecordBatch,
RecordBatch left, RecordBatch right) {
- this.unionAllRecordBatch = unionAllRecordBatch;
- leftSide = new OneSideInput(left);
- rightSide = new OneSideInput(right);
- }
-
- private void setBothSideEmpty(boolean bothEmpty) {
- this.bothEmpty = bothEmpty;
- }
-
- private boolean isBothSideEmpty() {
- return bothEmpty;
- }
-
- public IterOutcome nextBatch() throws SchemaChangeException {
- if(upstream == RecordBatch.IterOutcome.NOT_YET) {
- IterOutcome iterLeft = leftSide.nextBatch();
- switch(iterLeft) {
- case OK_NEW_SCHEMA:
- /*
- * If the first few record batches are all empty,
- * there is no way to tell whether these empty batches are
coming from empty files.
- * It is incorrect to infer output types when either side
could be coming from empty.
- *
- * Thus, while-loop is necessary to skip those empty batches.
- */
- whileLoop:
- while(leftSide.getRecordBatch().getRecordCount() == 0) {
- iterLeft = leftSide.nextBatch();
-
- switch(iterLeft) {
- case STOP:
- case OUT_OF_MEMORY:
- return iterLeft;
-
- case NONE:
- // Special Case: The left side was an empty input.
- leftIsFinish = true;
- break whileLoop;
-
- case NOT_YET:
- case OK_NEW_SCHEMA:
- case OK:
- continue whileLoop;
-
- default:
- throw new IllegalStateException(
- String.format("Unexpected state %s.", iterLeft));
- }
- }
-
- break;
- case STOP:
- case OUT_OF_MEMORY:
- return iterLeft;
-
- default:
- throw new IllegalStateException(
- String.format("Unexpected state %s.", iterLeft));
- }
-
- IterOutcome iterRight = rightSide.nextBatch();
- switch(iterRight) {
- case OK_NEW_SCHEMA:
- // Unless there is no record batch on the left side of the
inputs,
- // always start processing from the left side.
- if(leftIsFinish) {
-
unionAllRecordBatch.setCurrentRecordBatch(rightSide.getRecordBatch());
- } else {
-
unionAllRecordBatch.setCurrentRecordBatch(leftSide.getRecordBatch());
- }
- // If the record count of the first batch from right input is
zero,
- // there are two possibilities:
- // 1. The right side is an empty input (e.g., file).
- // 2. There will be more records carried by later batches.
-
- /*
- * If the first few record batches are all empty,
- * there is no way to tell whether these empty batches are
coming from empty files.
- * It is incorrect to infer output types when either side
could be coming from empty.
- *
- * Thus, while-loop is necessary to skip those empty batches.
- */
- whileLoop:
- while(rightSide.getRecordBatch().getRecordCount() == 0) {
- iterRight = rightSide.nextBatch();
- switch(iterRight) {
- case STOP:
- case OUT_OF_MEMORY:
- return iterRight;
-
- case NONE:
- // Special Case: The right side was an empty input.
- rightIsFinish = true;
- break whileLoop;
-
- case NOT_YET:
- case OK_NEW_SCHEMA:
- case OK:
- continue whileLoop;
-
- default:
- throw new IllegalStateException(
- String.format("Unexpected state %s.", iterRight));
- }
- }
-
- if(leftIsFinish && rightIsFinish) {
- setBothSideEmpty(true);
- }
-
- inferOutputFields();
- break;
-
- case STOP:
- case OUT_OF_MEMORY:
- return iterRight;
-
- default:
- throw new IllegalStateException(
- String.format("Unexpected state %s.", iterRight));
- }
-
-
-
- upstream = IterOutcome.OK_NEW_SCHEMA;
- return upstream;
- } else {
- if(isBothSideEmpty()) {
- return IterOutcome.NONE;
- }
-
- unionAllRecordBatch.clearCurrentRecordBatch();
-
- if(leftIsFinish && rightIsFinish) {
- upstream = IterOutcome.NONE;
- return upstream;
- } else if(leftIsFinish) {
- IterOutcome iterOutcome = rightSide.nextBatch();
-
- switch(iterOutcome) {
- case NONE:
- rightIsFinish = true;
- // fall through
- case STOP:
- case OUT_OF_MEMORY:
- upstream = iterOutcome;
- return upstream;
-
- case OK_NEW_SCHEMA:
-
if(!rightSide.getRecordBatch().getSchema().equals(rightSchema)) {
- throw new SchemaChangeException("Schema change detected in
the right input of Union-All. This is not currently supported");
- }
- iterOutcome = IterOutcome.OK;
- // fall through
- case OK:
-
unionAllRecordBatch.setCurrentRecordBatch(rightSide.getRecordBatch());
- upstream = iterOutcome;
- return upstream;
-
- default:
- throw new IllegalStateException(String.format("Unknown state
%s.", upstream));
- }
- } else if(rightIsFinish) {
- IterOutcome iterOutcome = leftSide.nextBatch();
- switch(iterOutcome) {
- case STOP:
- case OUT_OF_MEMORY:
- case NONE:
- upstream = iterOutcome;
- return upstream;
-
- case OK:
-
unionAllRecordBatch.setCurrentRecordBatch(leftSide.getRecordBatch());
- upstream = iterOutcome;
- return upstream;
-
- default:
- throw new IllegalStateException(String.format("Unknown state
%s.", iterOutcome));
- }
- } else {
- IterOutcome iterOutcome = leftSide.nextBatch();
-
- switch(iterOutcome) {
- case STOP:
- case OUT_OF_MEMORY:
- upstream = iterOutcome;
- return upstream;
-
- case OK_NEW_SCHEMA:
-
if(!leftSide.getRecordBatch().getSchema().equals(leftSchema)) {
- throw new SchemaChangeException("Schema change detected in
the left input of Union-All. This is not currently supported");
- }
-
- iterOutcome = IterOutcome.OK;
- // fall through
- case OK:
-
unionAllRecordBatch.setCurrentRecordBatch(leftSide.getRecordBatch());
- upstream = iterOutcome;
- return upstream;
-
- case NONE:
-
unionAllRecordBatch.setCurrentRecordBatch(rightSide.getRecordBatch());
- upstream = IterOutcome.OK;
- leftIsFinish = true;
- return upstream;
-
- default:
- throw new IllegalStateException(String.format("Unknown state
%s.", upstream));
- }
- }
- }
- }
- /**
- *
- * Summarize the inference in the four different situations:
- * First of all, the field names are always determined by the left side
- * (Even when the left side is from an empty file, we have the column
names.)
- *
- * Cases:
- * 1. Left: non-empty; Right: non-empty
- * types determined by both sides with implicit casting involved
- * 2. Left: empty; Right: non-empty
- * type from the right
- * 3. Left: non-empty; Right: empty
- * types from the left
- * 4. Left: empty; Right: empty
- * types are nullable integer
- */
- private void inferOutputFields() {
- if(!leftIsFinish && !rightIsFinish) {
- // Both sides are non-empty
- inferOutputFieldsBothSide();
- } else if(!rightIsFinish) {
- // Left side is non-empty
- // While use left side's column names as output column names,
- // use right side's column types as output column types.
- inferOutputFieldsFromSingleSide(
- leftSide.getRecordBatch().getSchema(),
- rightSide.getRecordBatch().getSchema());
+ // The output table's column names always follow the left table,
+ // where the output type is chosen based on DRILL's implicit casting
rules
+ private void inferOutputFieldsBothSide(final BatchSchema leftSchema,
final BatchSchema rightSchema) {
+// outputFields = Lists.newArrayList();
+ final Iterator<MaterializedField> leftIter = leftSchema.iterator();
+ final Iterator<MaterializedField> rightIter = rightSchema.iterator();
+
+ int index = 1;
+ while (leftIter.hasNext() && rightIter.hasNext()) {
+ MaterializedField leftField = leftIter.next();
+ MaterializedField rightField = rightIter.next();
+
+ if (hasSameTypeAndMode(leftField, rightField)) {
+ TypeProtos.MajorType.Builder builder =
TypeProtos.MajorType.newBuilder().setMinorType(leftField.getType().getMinorType()).setMode(leftField.getDataMode());
+ builder =
Types.calculateTypePrecisionAndScale(leftField.getType(), rightField.getType(),
builder);
+ container.addOrGet(MaterializedField.create(leftField.getPath(),
builder.build()), callBack);
+ } else if (Types.isUntypedNull(rightField.getType())) {
+ container.addOrGet(leftField, callBack);
+ } else if (Types.isUntypedNull(leftField.getType())) {
+ container.addOrGet(MaterializedField.create(leftField.getPath(),
rightField.getType()), callBack);
} else {
- // Either right side is empty or both are empty
- // Using left side's schema is sufficient
- inferOutputFieldsFromSingleSide(
- leftSide.getRecordBatch().getSchema(),
- leftSide.getRecordBatch().getSchema());
- }
- }
-
- // The output table's column names always follow the left table,
- // where the output type is chosen based on DRILL's implicit casting
rules
- private void inferOutputFieldsBothSide() {
- outputFields = Lists.newArrayList();
- leftSchema = leftSide.getRecordBatch().getSchema();
- rightSchema = rightSide.getRecordBatch().getSchema();
- Iterator<MaterializedField> leftIter = leftSchema.iterator();
- Iterator<MaterializedField> rightIter = rightSchema.iterator();
-
- int index = 1;
- while (leftIter.hasNext() && rightIter.hasNext()) {
- MaterializedField leftField = leftIter.next();
- MaterializedField rightField = rightIter.next();
-
- if (hasSameTypeAndMode(leftField, rightField)) {
- MajorType.Builder builder =
MajorType.newBuilder().setMinorType(leftField.getType().getMinorType()).setMode(leftField.getDataMode());
+ // If the output type is not the same,
+ // cast the column of one of the table to a data type which is the
Least Restrictive
+ TypeProtos.MajorType.Builder builder =
TypeProtos.MajorType.newBuilder();
+ if (leftField.getType().getMinorType() ==
rightField.getType().getMinorType()) {
+ builder.setMinorType(leftField.getType().getMinorType());
builder =
Types.calculateTypePrecisionAndScale(leftField.getType(), rightField.getType(),
builder);
- outputFields.add(MaterializedField.create(leftField.getPath(),
builder.build()));
} else {
- // If the output type is not the same,
- // cast the column of one of the table to a data type which is
the Least Restrictive
- MajorType.Builder builder = MajorType.newBuilder();
- if (leftField.getType().getMinorType() ==
rightField.getType().getMinorType()) {
- builder.setMinorType(leftField.getType().getMinorType());
- builder =
Types.calculateTypePrecisionAndScale(leftField.getType(), rightField.getType(),
builder);
- } else {
- List<MinorType> types = Lists.newLinkedList();
- types.add(leftField.getType().getMinorType());
- types.add(rightField.getType().getMinorType());
- MinorType outputMinorType =
TypeCastRules.getLeastRestrictiveType(types);
- if (outputMinorType == null) {
- throw new DrillRuntimeException("Type mismatch between " +
leftField.getType().getMinorType().toString() +
- " on the left side and " +
rightField.getType().getMinorType().toString() +
- " on the right side in column " + index + " of UNION
ALL");
- }
- builder.setMinorType(outputMinorType);
+ List<TypeProtos.MinorType> types = Lists.newLinkedList();
+ types.add(leftField.getType().getMinorType());
+ types.add(rightField.getType().getMinorType());
+ TypeProtos.MinorType outputMinorType =
TypeCastRules.getLeastRestrictiveType(types);
+ if (outputMinorType == null) {
+ throw new DrillRuntimeException("Type mismatch between " +
leftField.getType().getMinorType().toString() +
+ " on the left side and " +
rightField.getType().getMinorType().toString() +
+ " on the right side in column " + index + " of UNION ALL");
}
-
- // The output data mode should be as flexible as the more
flexible one from the two input tables
- List<DataMode> dataModes = Lists.newLinkedList();
- dataModes.add(leftField.getType().getMode());
- dataModes.add(rightField.getType().getMode());
-
builder.setMode(TypeCastRules.getLeastRestrictiveDataMode(dataModes));
-
- outputFields.add(MaterializedField.create(leftField.getPath(),
builder.build()));
+ builder.setMinorType(outputMinorType);
}
- ++index;
- }
-
- assert !leftIter.hasNext() && ! rightIter.hasNext() : "Mis-match of
column count should have been detected when validating sqlNode at planning";
- }
- private void inferOutputFieldsFromSingleSide(final BatchSchema
schemaForNames, final BatchSchema schemaForTypes) {
- outputFields = Lists.newArrayList();
+ // The output data mode should be as flexible as the more flexible
one from the two input tables
+ List<TypeProtos.DataMode> dataModes = Lists.newLinkedList();
+ dataModes.add(leftField.getType().getMode());
+ dataModes.add(rightField.getType().getMode());
+
builder.setMode(TypeCastRules.getLeastRestrictiveDataMode(dataModes));
- final List<String> outputColumnNames = Lists.newArrayList();
- final Iterator<MaterializedField> iterForNames =
schemaForNames.iterator();
- while(iterForNames.hasNext()) {
- outputColumnNames.add(iterForNames.next().getPath());
- }
-
- final Iterator<MaterializedField> iterForTypes =
schemaForTypes.iterator();
- for(int i = 0; iterForTypes.hasNext(); ++i) {
- MaterializedField field = iterForTypes.next();
-
outputFields.add(MaterializedField.create(outputColumnNames.get(i),
field.getType()));
+ container.addOrGet(MaterializedField.create(leftField.getPath(),
builder.build()), callBack);
}
+ ++index;
}
- public List<MaterializedField> getOutputFields() {
- if(outputFields == null) {
- throw new NullPointerException("Output fields have not been
inferred");
- }
-
- return outputFields;
- }
+ assert !leftIter.hasNext() && ! rightIter.hasNext() : "Mis-match of
column count should have been detected when validating sqlNode at planning";
--- End diff --
Thanks for the explanation.
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