aokolnychyi commented on a change in pull request #3400:
URL: https://github.com/apache/iceberg/pull/3400#discussion_r737852994
##########
File path:
spark/v3.2/spark/src/main/java/org/apache/iceberg/spark/source/SparkBatchQueryScan.java
##########
@@ -104,30 +144,100 @@
}
}
- if (splitSize != null) {
- scan = scan.option(TableProperties.SPLIT_SIZE, splitSize.toString());
+ for (Expression filter : filterExpressions()) {
+ scan = scan.filter(filter);
}
- if (splitLookback != null) {
- scan = scan.option(TableProperties.SPLIT_LOOKBACK,
splitLookback.toString());
+ try (CloseableIterable<FileScanTask> filesIterable = scan.planFiles()) {
+ this.files = Lists.newArrayList(filesIterable);
+ } catch (IOException e) {
+ throw new UncheckedIOException("Failed to close table scan: " + scan,
e);
}
+ }
- if (splitOpenFileCost != null) {
- scan = scan.option(TableProperties.SPLIT_OPEN_FILE_COST,
splitOpenFileCost.toString());
- }
+ return files;
+ }
- for (Expression filter : filterExpressions()) {
- scan = scan.filter(filter);
+ @Override
+ protected List<CombinedScanTask> tasks() {
+ if (tasks == null) {
+ CloseableIterable<FileScanTask> splitFiles = TableScanUtil.splitFiles(
+ CloseableIterable.withNoopClose(files()),
+ splitSize);
+ CloseableIterable<CombinedScanTask> scanTasks = TableScanUtil.planTasks(
+ splitFiles, splitSize,
+ splitLookback, splitOpenFileCost);
+ tasks = Lists.newArrayList(scanTasks);
+ }
+
+ return tasks;
+ }
+
+ @Override
+ public NamedReference[] filterAttributes() {
+ Set<Integer> partitionFieldSourceIds = Sets.newHashSet();
+
+ for (Integer specId : specIds()) {
+ PartitionSpec spec = table().specs().get(specId);
+ for (PartitionField field : spec.fields()) {
+ partitionFieldSourceIds.add(field.sourceId());
}
+ }
- try (CloseableIterable<CombinedScanTask> tasksIterable =
scan.planTasks()) {
- this.tasks = Lists.newArrayList(tasksIterable);
- } catch (IOException e) {
- throw new RuntimeIOException(e, "Failed to close table scan: %s",
scan);
+ Map<Integer, String> nameById =
TypeUtil.indexQuotedNameById(table().schema().asStruct());
+ return partitionFieldSourceIds.stream()
+ .filter(fieldId -> expectedSchema().findField(fieldId) != null)
+ .map(fieldId ->
org.apache.spark.sql.connector.expressions.Expressions.column(nameById.get(fieldId)))
+ .toArray(NamedReference[]::new);
+ }
+
+ @Override
+ public void filter(Filter[] filters) {
+ Expression runtimeFilterExpr = Expressions.alwaysTrue();
+
+ for (Filter filter : filters) {
+ Expression expr = SparkFilters.convert(filter);
+ if (expr != null) {
+ try {
+ Binder.bind(expectedSchema().asStruct(), expr, caseSensitive());
+ runtimeFilterExpr = Expressions.and(runtimeFilterExpr, expr);
+ } catch (ValidationException e) {
+ LOG.error("Failed to bind {} to expected schema, skipping runtime
filter", expr, e);
+ }
+ } else {
+ LOG.warn("Unsupported runtime filter {}", filter);
}
}
- return tasks;
+ if (runtimeFilterExpr != Expressions.alwaysTrue()) {
+ Map<Integer, Evaluator> evaluatorsBySpecId = Maps.newHashMap();
+
+ for (Integer specId : specIds()) {
+ PartitionSpec spec = table().specs().get(specId);
+ Expression inclusiveExpr =
Projections.inclusive(spec).project(runtimeFilterExpr);
+ Evaluator inclusive = new Evaluator(spec.partitionType(),
inclusiveExpr);
+ evaluatorsBySpecId.put(specId, inclusive);
+ }
+
+ LOG.info("Trying to filter {} files using runtime filter {}",
files().size(), runtimeFilterExpr);
+
+ List<FileScanTask> filteredFiles = files().stream()
+ .filter(file -> {
+ Evaluator evaluator = evaluatorsBySpecId.get(file.spec().specId());
+ return evaluator.eval(file.file().partition());
+ })
+ .collect(Collectors.toList());
+
+ LOG.info("{} files matched runtime filter {}", filteredFiles.size(),
runtimeFilterExpr);
+
+ if (filteredFiles.size() < files().size()) {
Review comment:
We convert all Spark filters into a single Iceberg expression that gets
evaluated on the currently planned files. Here, I am trying to not invalidate
the tasks if the filtering was useless to avoid replanning splits again.
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