Github user amansinha100 commented on a diff in the pull request:
https://github.com/apache/drill/pull/156#discussion_r39527135
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/partition/PruneScanRule.java
---
@@ -176,81 +177,103 @@ protected void doOnMatch(RelOptRuleCall call,
DrillFilterRel filterRel, DrillPro
RexNode pruneCondition = c.getFinalCondition();
if (pruneCondition == null) {
+ logger.debug("No conditions were found eligible for partition
pruning.");
return;
}
// set up the partitions
- final GroupScan groupScan = scanRel.getGroupScan();
- List<PartitionLocation> partitions = descriptor.getPartitions();
-
- if (partitions.size() > Character.MAX_VALUE) {
- return;
- }
-
- final NullableBitVector output = new
NullableBitVector(MaterializedField.create("", Types.optional(MinorType.BIT)),
allocator);
- final VectorContainer container = new VectorContainer();
-
- try {
- final ValueVector[] vectors = new
ValueVector[descriptor.getMaxHierarchyLevel()];
- for (int partitionColumnIndex :
BitSets.toIter(partitionColumnBitSet)) {
- SchemaPath column =
SchemaPath.getSimplePath(fieldNameMap.get(partitionColumnIndex));
- MajorType type = descriptor.getVectorType(column, settings);
- MaterializedField field = MaterializedField.create(column, type);
- ValueVector v = TypeHelper.getNewVector(field, allocator);
- v.allocateNew();
- vectors[partitionColumnIndex] = v;
- container.add(v);
- }
-
- // populate partition vectors.
- descriptor.populatePartitionVectors(vectors, partitions,
partitionColumnBitSet, fieldNameMap);
-
- // materialize the expression
- logger.debug("Attempting to prune {}", pruneCondition);
- final LogicalExpression expr = DrillOptiq.toDrill(new
DrillParseContext(settings), scanRel, pruneCondition);
- final ErrorCollectorImpl errors = new ErrorCollectorImpl();
-
- LogicalExpression materializedExpr =
ExpressionTreeMaterializer.materialize(expr, container, errors,
optimizerContext.getFunctionRegistry());
- // Make sure pruneCondition's materialized expression is always of
BitType, so that
- // it's same as the type of output vector.
- if (materializedExpr.getMajorType().getMode() ==
TypeProtos.DataMode.REQUIRED) {
- materializedExpr =
ExpressionTreeMaterializer.convertToNullableType(
- materializedExpr,
- materializedExpr.getMajorType().getMinorType(),
- optimizerContext.getFunctionRegistry(),
- errors);
+ List<String> newFiles = Lists.newArrayList();
+ long numTotal = 0; // total number of partitions
+ int batchIndex = 0;
+ String firstLocation = null;
+
+ // Outer loop: iterate over a list of batches of PartitionLocations
+ for (List<PartitionLocation> partitions : descriptor) {
+ numTotal += partitions.size();
+ logger.debug("Evaluating partition pruning for batch {}",
batchIndex);
+ if (batchIndex == 0) { // save the first location in case everything
is pruned
+ firstLocation = partitions.get(0).getEntirePartitionLocation();
}
+ final NullableBitVector output = new
NullableBitVector(MaterializedField.create("", Types.optional(MinorType.BIT)),
allocator);
+ final VectorContainer container = new VectorContainer();
+
+ try {
+ final ValueVector[] vectors = new
ValueVector[descriptor.getMaxHierarchyLevel()];
+ for (int partitionColumnIndex :
BitSets.toIter(partitionColumnBitSet)) {
+ SchemaPath column =
SchemaPath.getSimplePath(fieldNameMap.get(partitionColumnIndex));
+ MajorType type = descriptor.getVectorType(column, settings);
+ MaterializedField field = MaterializedField.create(column, type);
+ ValueVector v = TypeHelper.getNewVector(field, allocator);
+ v.allocateNew();
+ vectors[partitionColumnIndex] = v;
+ container.add(v);
+ }
- if (errors.getErrorCount() != 0) {
- logger.warn("Failure while materializing expression [{}]. Errors:
{}", expr, errors);
- }
+ // populate partition vectors.
+ descriptor.populatePartitionVectors(vectors, partitions,
partitionColumnBitSet, fieldNameMap);
+
+ // materialize the expression
+ logger.debug("Attempting to prune {}", pruneCondition);
+ final LogicalExpression expr = DrillOptiq.toDrill(new
DrillParseContext(settings), scanRel, pruneCondition);
+ final ErrorCollectorImpl errors = new ErrorCollectorImpl();
+
+ LogicalExpression materializedExpr =
ExpressionTreeMaterializer.materialize(expr, container, errors,
optimizerContext.getFunctionRegistry());
+ // Make sure pruneCondition's materialized expression is always of
BitType, so that
+ // it's same as the type of output vector.
+ if (materializedExpr.getMajorType().getMode() ==
TypeProtos.DataMode.REQUIRED) {
+ materializedExpr =
ExpressionTreeMaterializer.convertToNullableType(
+ materializedExpr,
+ materializedExpr.getMajorType().getMinorType(),
+ optimizerContext.getFunctionRegistry(),
+ errors);
+ }
- output.allocateNew(partitions.size());
- InterpreterEvaluator.evaluate(partitions.size(), optimizerContext,
container, output, materializedExpr);
- int record = 0;
+ if (errors.getErrorCount() != 0) {
--- End diff --
Actually, the ExpressionTreeMaterializer.visitSchemaPath() needs access to
the VectorContainer, so doing this materialization outside the loop is not an
option since the VectorContainer is initialized inside the loop. But we can do
this only once by putting it inside the if (batchIndex == 0) condition. In
fact, the container itself should be created only once and cleared in each
iteration. I will make that change.
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