Gabriel39 commented on code in PR #65851:
URL: https://github.com/apache/doris/pull/65851#discussion_r3683229149
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fe/fe-core/src/main/java/org/apache/doris/datasource/iceberg/source/IcebergScanNode.java:
##########
@@ -530,30 +598,792 @@ void enableCurrentIcebergScanSemantics() {
params.setIcebergScanSemanticsVersion(ICEBERG_SCAN_SEMANTICS_VERSION);
}
+ /**
+ * Build the schema metadata carrier used by both scanners and
equality-delete readers.
+ *
+ * <p>Batch-mode delete files are planned asynchronously after scan
parameters are sent to BE.
+ * The authenticated manifest preflight therefore supplies the live
equality field IDs before
+ * the schema carrier is serialized. Only historical fields referenced by
those delete files are
+ * added, so an unrelated dropped type cannot make an otherwise supported
scan fail.
+ */
+ @VisibleForTesting
+ List<NestedField> getSchemaFieldsForScan(
+ Schema scanSchema, Set<Integer> equalityDeleteFieldIds) throws
UserException {
+ List<NestedField> fields = new ArrayList<>(scanSchema.columns());
+ if (isSystemTable || equalityDeleteFieldIds.isEmpty()) {
+ return fields;
+ }
+
+ Set<Integer> missingFieldIds = new HashSet<>(equalityDeleteFieldIds);
+
missingFieldIds.removeAll(TypeUtil.indexById(scanSchema.asStruct()).keySet());
+ if (missingFieldIds.isEmpty()) {
+ return fields;
+ }
+
+ List<Schema> schemaHistory = getMetadataSchemaHistory();
+ // Schema IDs may be reused when evolution returns to an earlier
schema, while the metadata
+ // list may also contain schemas committed after a time-travel or
branch target. Follow the
+ // actual scan snapshot's parent chain first so the field definition
active on that lineage
+ // wins. Then use the complete metadata list as a fallback for
schema-only changes and
+ // expired ancestors. A fallback definition may come from a later
rename, so BE resolves an
+ // ID-less equality key through the target mapping first and the
delete file's original key
+ // name second. Initial-default and field identity remain bound to the
stable field ID.
+ Snapshot snapshot = createTableScan().snapshot();
+ while (snapshot != null) {
+ Integer schemaId = snapshot.schemaId();
+ if (schemaId != null) {
+ Schema historicalSchema = icebergTable.schemas().get(schemaId);
+ Preconditions.checkState(historicalSchema != null,
+ "Iceberg snapshot schema %s is absent from table
metadata", schemaId);
+ addHistoricalEqualityFields(fields, missingFieldIds,
historicalSchema);
+ }
+ Long parentId = snapshot.parentId();
+ snapshot = parentId == null ? null :
icebergTable.snapshot(parentId);
+ }
+ for (int index = schemaHistory.size() - 1; index >= 0; index--) {
+ addHistoricalEqualityFields(fields, missingFieldIds,
schemaHistory.get(index));
+ }
+ Preconditions.checkState(missingFieldIds.isEmpty(),
+ "Iceberg equality-delete fields are absent from schema
history: %s",
+ missingFieldIds);
+ return fields;
+ }
+
+ private List<Schema> getMetadataSchemaHistory() {
+ Preconditions.checkState(icebergTable instanceof HasTableOperations,
+ "Iceberg table does not expose metadata schema history: %s",
icebergTable.name());
+ return ((HasTableOperations)
icebergTable).operations().current().schemas();
+ }
+
+ /**
+ * Return only schemas that can describe files visible from the selected
target.
+ *
+ * <p>The query schema is included explicitly because a schema-only commit
does not create a
+ * snapshot. Other schemas are taken from the selected snapshot's parent
lineage and from
+ * cherry-picked source snapshots (including their ancestry), excluding
later main-branch and
+ * unrelated branch schemas from the rolling-upgrade fence. An empty
optional means snapshot
+ * expiration truncated any required lineage, so callers must
conservatively require current
+ * scan semantics.
+ */
+ @VisibleForTesting
+ Optional<List<Schema>> getRequiredFieldSchemaHistory(Schema scanSchema)
throws UserException {
+ List<Schema> schemas = new ArrayList<>();
+ Set<Integer> schemaIds = new HashSet<>();
+ schemas.add(scanSchema);
+ schemaIds.add(scanSchema.schemaId());
+
+ Snapshot selectedSnapshot = createTableScan().snapshot();
+ Deque<Snapshot> snapshots = new ArrayDeque<>();
+ if (selectedSnapshot != null) {
+ snapshots.add(selectedSnapshot);
+ }
+ Set<Long> visitedSnapshotIds = new HashSet<>();
+ while (!snapshots.isEmpty()) {
+ Snapshot snapshot = snapshots.removeFirst();
+ if (!visitedSnapshotIds.add(snapshot.snapshotId())) {
+ continue;
+ }
+ Integer schemaId = snapshot.schemaId();
+ if (schemaId != null && schemaIds.add(schemaId)) {
+ Schema lineageSchema = icebergTable.schemas().get(schemaId);
+ Preconditions.checkState(lineageSchema != null,
+ "Iceberg snapshot schema %s is absent from table
metadata", schemaId);
+ schemas.add(lineageSchema);
+ }
+ Long parentId = snapshot.parentId();
+ if (parentId != null) {
+ Snapshot parent = icebergTable.snapshot(parentId);
+ if (parent == null) {
+ return Optional.empty();
+ }
+ snapshots.addLast(parent);
+ }
+ String sourceSnapshotId =
+
snapshot.summary().get(SnapshotSummary.SOURCE_SNAPSHOT_ID_PROP);
+ if (sourceSnapshotId != null) {
+ Snapshot sourceSnapshot =
+
icebergTable.snapshot(Long.parseLong(sourceSnapshotId));
+ if (sourceSnapshot == null) {
+ return Optional.empty();
+ }
+ snapshots.addLast(sourceSnapshot);
+ }
+ }
+ return Optional.of(schemas);
+ }
+
+ private static void addHistoricalEqualityFields(List<NestedField> fields,
+ Set<Integer> missingFieldIds, Schema historicalSchema) {
+ Map<Integer, NestedField> historicalFields =
+ TypeUtil.indexById(historicalSchema.asStruct());
+ Set<Integer> selectedFieldIds = new HashSet<>();
+ for (Integer fieldId : missingFieldIds) {
+ NestedField field = historicalFields.get(fieldId);
+ if (field != null) {
+ Preconditions.checkState(field.type().isPrimitiveType(),
+ "Iceberg equality-delete field %s must be primitive",
fieldId);
+ selectedFieldIds.add(fieldId);
+ }
+ }
+ if (selectedFieldIds.isEmpty()) {
+ return;
+ }
+
+ Schema selectedSchema = TypeUtil.select(historicalSchema,
selectedFieldIds);
+ mergeHistoricalEqualityFields(fields, selectedSchema.columns());
+ missingFieldIds.removeAll(selectedFieldIds);
+ }
+
+ private static void mergeHistoricalEqualityFields(
+ List<NestedField> fields, List<NestedField> historicalFields) {
+ for (NestedField historicalField : historicalFields) {
+ int currentIndex = -1;
+ for (int index = 0; index < fields.size(); index++) {
+ if (fields.get(index).fieldId() == historicalField.fieldId()) {
+ currentIndex = index;
+ break;
+ }
+ }
+ if (currentIndex < 0) {
+ fields.add(historicalField);
+ continue;
+ }
+
+ NestedField currentField = fields.get(currentIndex);
+ Type mergedType = mergeHistoricalEqualityType(
+ currentField.type(), historicalField.type());
+ if (mergedType != currentField.type()) {
+ fields.set(currentIndex, Types.NestedField.from(currentField)
+ .ofType(mergedType)
+ .build());
+ }
+ }
+ }
+
+ private static Type mergeHistoricalEqualityType(Type currentType, Type
historicalType) {
+ Preconditions.checkState(currentType.typeId() ==
historicalType.typeId(),
+ "Iceberg equality-delete ancestor type changed from %s to %s",
+ historicalType, currentType);
+ switch (currentType.typeId()) {
+ case STRUCT:
+ List<NestedField> mergedFields =
+ new ArrayList<>(currentType.asStructType().fields());
+ mergeHistoricalEqualityFields(
+ mergedFields, historicalType.asStructType().fields());
+ if (mergedFields.equals(currentType.asStructType().fields())) {
+ return currentType;
+ }
+ return Types.StructType.of(mergedFields);
+ case LIST:
+ Types.ListType currentList = currentType.asListType();
+ Types.ListType historicalList = historicalType.asListType();
+ Preconditions.checkState(currentList.elementId() ==
historicalList.elementId(),
+ "Iceberg equality-delete list element id changed from
%s to %s",
+ historicalList.elementId(), currentList.elementId());
+ Type mergedElement = mergeHistoricalEqualityType(
+ currentList.elementType(),
historicalList.elementType());
+ if (mergedElement == currentList.elementType()) {
+ return currentType;
+ }
+ return currentList.isElementOptional()
+ ? Types.ListType.ofOptional(currentList.elementId(),
mergedElement)
+ : Types.ListType.ofRequired(currentList.elementId(),
mergedElement);
+ case MAP:
+ Types.MapType currentMap = currentType.asMapType();
+ Types.MapType historicalMap = historicalType.asMapType();
+ Preconditions.checkState(currentMap.keyId() ==
historicalMap.keyId()
+ && currentMap.valueId() ==
historicalMap.valueId(),
+ "Iceberg equality-delete map field ids changed from
(%s, %s) to (%s, %s)",
+ historicalMap.keyId(), historicalMap.valueId(),
+ currentMap.keyId(), currentMap.valueId());
+ Type mergedKey = mergeHistoricalEqualityType(
+ currentMap.keyType(), historicalMap.keyType());
+ Type mergedValue = mergeHistoricalEqualityType(
+ currentMap.valueType(), historicalMap.valueType());
+ if (mergedKey == currentMap.keyType()
+ && mergedValue == currentMap.valueType()) {
+ return currentType;
+ }
+ return currentMap.isValueOptional()
+ ? Types.MapType.ofOptional(
+ currentMap.keyId(), currentMap.valueId(),
+ mergedKey, mergedValue)
+ : Types.MapType.ofRequired(
+ currentMap.keyId(), currentMap.valueId(),
+ mergedKey, mergedValue);
+ default:
+ Preconditions.checkState(currentType.equals(historicalType),
+ "Iceberg equality-delete field type changed from %s to
%s",
+ historicalType, currentType);
+ return currentType;
+ }
+ }
+
+ @VisibleForTesting
+ static boolean requiresRecursiveInitialDefaultMaterialization(
+ Schema scanSchema, List<SlotDescriptor> projectedSlots) {
+ return requiresProjectedIcebergField(scanSchema, projectedSlots,
+ (field, isTopLevel) -> field.initialDefault() != null
+ && (!isTopLevel || field.type().isNestedType()));
+ }
+
+ @VisibleForTesting
+ static boolean requiresMissingRequiredFieldRejection(
+ Schema scanSchema, List<SlotDescriptor> projectedSlots,
+ Optional<List<Schema>> historicalSchemas) {
+ return !historicalSchemas.isPresent()
+ || requiresMissingRequiredFieldRejection(
+ scanSchema, projectedSlots, historicalSchemas.get());
+ }
+
+ @VisibleForTesting
+ static boolean requiresMissingRequiredFieldRejection(
+ Schema scanSchema, List<SlotDescriptor> projectedSlots,
+ List<Schema> historicalSchemas) {
+ Map<Integer, NestedField> fieldById =
TypeUtil.indexById(scanSchema.asStruct());
+ Map<Integer, Integer> parentById =
TypeUtil.indexParents(scanSchema.asStruct());
+ Set<Integer> collectionWrapperFieldIds = new HashSet<>();
+ collectCollectionWrapperFieldIds(scanSchema.asStruct(),
collectionWrapperFieldIds);
+ Set<Integer> potentiallyMissingRequiredFieldIds = new HashSet<>();
+ for (Schema historicalSchema : historicalSchemas) {
+ Map<Integer, NestedField> historicalFieldById =
+ TypeUtil.indexById(historicalSchema.asStruct());
+ for (NestedField field : fieldById.values()) {
+ NestedField historicalField =
historicalFieldById.get(field.fieldId());
+ if (historicalField != null) {
+ if (!collectionWrapperFieldIds.contains(field.fieldId())
+ && field.isRequired() && field.initialDefault() ==
null
+ && historicalField.isOptional()) {
+
potentiallyMissingRequiredFieldIds.add(field.fieldId());
+ }
+ continue;
+ }
+ NestedField highestMissingField = field;
+ Integer parentId = parentById.get(field.fieldId());
+ while (parentId != null &&
!historicalFieldById.containsKey(parentId)) {
+ highestMissingField =
Preconditions.checkNotNull(fieldById.get(parentId),
+ "Iceberg parent field %s is absent from scan
schema", parentId);
+ parentId = parentById.get(parentId);
+ }
+ // If the highest missing ancestor is optional, the old
physical subtree is NULL
+ // and no required descendant is materialized. A non-null
initial default is
+ // already covered by
requiresRecursiveInitialDefaultMaterialization().
+ if
(!collectionWrapperFieldIds.contains(highestMissingField.fieldId())
+ && highestMissingField.isRequired()
+ && highestMissingField.initialDefault() == null) {
+
potentiallyMissingRequiredFieldIds.add(highestMissingField.fieldId());
+ }
+ }
+ }
+ return requiresProjectedIcebergField(scanSchema, projectedSlots,
+ (field, isTopLevel) ->
potentiallyMissingRequiredFieldIds.contains(
+ field.fieldId()));
+ }
+
+ private static void collectCollectionWrapperFieldIds(
+ Type type, Set<Integer> collectionWrapperFieldIds) {
+ switch (type.typeId()) {
+ case STRUCT:
+ for (NestedField field : type.asStructType().fields()) {
+ collectCollectionWrapperFieldIds(field.type(),
collectionWrapperFieldIds);
+ }
+ break;
+ case LIST:
+ Types.ListType listType = (Types.ListType) type;
+ collectionWrapperFieldIds.add(listType.elementId());
+ collectCollectionWrapperFieldIds(
+ listType.elementType(), collectionWrapperFieldIds);
+ break;
+ case MAP:
+ Types.MapType mapType = (Types.MapType) type;
+ collectionWrapperFieldIds.add(mapType.keyId());
+ collectionWrapperFieldIds.add(mapType.valueId());
+ collectCollectionWrapperFieldIds(mapType.keyType(),
collectionWrapperFieldIds);
+ collectCollectionWrapperFieldIds(mapType.valueType(),
collectionWrapperFieldIds);
+ break;
+ default:
+ break;
+ }
+ }
+
+ private static boolean requiresProjectedIcebergField(
+ Schema scanSchema, List<SlotDescriptor> projectedSlots,
+ ProjectedFieldRequirement requirement) {
+ Map<Integer, NestedField> fieldById =
TypeUtil.indexById(scanSchema.asStruct());
+ Set<Integer> topLevelFieldIds = new HashSet<>();
+ for (NestedField field : scanSchema.columns()) {
+ topLevelFieldIds.add(field.fieldId());
+ }
+ for (SlotDescriptor slot : projectedSlots) {
+ Column column = slot.getColumn();
+ List<ColumnAccessPath> accessPaths = slot.getAllAccessPaths();
+ if (accessPaths != null && !accessPaths.isEmpty()) {
+ for (ColumnAccessPath accessPath : accessPaths) {
+ List<String> path = accessPath.getPath();
+ Preconditions.checkState(!path.isEmpty(),
+ "Iceberg column access path must not be empty");
+
Preconditions.checkState(matchesAccessPathComponent(column, path.get(0)),
+ "Iceberg access path root %s does not match column
%s", path.get(0),
+ column.getName());
+ if (requiresProjectedIcebergField(
+ column, path, 1, fieldById,
+ topLevelFieldIds.contains(column.getUniqueId()),
requirement)) {
+ return true;
+ }
+ }
+ } else if (requiresProjectedIcebergField(
+ column, slot.getType(), fieldById,
+ topLevelFieldIds.contains(column.getUniqueId()),
requirement)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ private static boolean requiresProjectedIcebergField(
+ Column column, org.apache.doris.catalog.Type projectedType,
+ Map<Integer, NestedField> fieldById, boolean isTopLevel,
+ ProjectedFieldRequirement requirement) {
+ if (requiresIcebergField(column, fieldById, isTopLevel, requirement)) {
+ return true;
+ }
+ if (column.getChildren() == null) {
+ return false;
+ }
+ if (projectedType.isStructType()) {
+ for (StructField projectedField : ((StructType)
projectedType).getFields()) {
+ Column child = findChildByName(column,
projectedField.getName());
+ Preconditions.checkState(child != null,
+ "Projected Iceberg child %s is absent from column %s",
+ projectedField.getName(), column.getName());
+ if (requiresProjectedIcebergField(
+ child, projectedField.getType(), fieldById, false,
requirement)) {
+ return true;
+ }
+ }
+ } else if (projectedType.isArrayType()) {
+ Preconditions.checkState(column.getChildren().size() == 1,
+ "Iceberg array column %s must have one child",
column.getName());
+ if (requiresProjectedIcebergField(
+ column.getChildren().get(0), ((ArrayType)
projectedType).getItemType(),
+ fieldById, false, requirement)) {
+ return true;
+ }
+ } else if (projectedType.isMapType()) {
+ Preconditions.checkState(column.getChildren().size() == 2,
+ "Iceberg map column %s must have two children",
column.getName());
+ MapType mapType = (MapType) projectedType;
+ if (requiresProjectedIcebergField(
+ column.getChildren().get(0), mapType.getKeyType(),
fieldById, false,
+ requirement)
+ || requiresProjectedIcebergField(
+ column.getChildren().get(1),
mapType.getValueType(), fieldById, false,
+ requirement)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ private static boolean requiresProjectedIcebergField(
+ Column column, List<String> path, int pathIndex,
+ Map<Integer, NestedField> fieldById, boolean isTopLevel,
+ ProjectedFieldRequirement requirement) {
+ if (requiresIcebergField(column, fieldById, isTopLevel, requirement)) {
+ return true;
+ }
+ if (pathIndex == path.size()) {
+ return requiresProjectedIcebergField(column, fieldById,
requirement);
+ }
+
+ String component = path.get(pathIndex);
+ if (AccessPathInfo.ACCESS_NULL.equals(component)
+ || AccessPathInfo.ACCESS_OFFSET.equals(component)) {
+ return false;
+ }
+ Preconditions.checkState(column.getChildren() != null,
+ "Iceberg access path continues below primitive column %s",
column.getName());
+
+ if (AccessPathInfo.ACCESS_ALL.equals(component)) {
+ if (column.getType().isArrayType()) {
+ Preconditions.checkState(column.getChildren().size() == 1,
+ "Iceberg array column %s must have one child",
column.getName());
+ return requiresProjectedIcebergField(
+ column.getChildren().get(0), path, pathIndex + 1,
fieldById, false,
+ requirement);
+ }
+ Preconditions.checkState(column.getType().isMapType(),
+ "Unexpected Iceberg access-all path below column %s",
column.getName());
+ Preconditions.checkState(column.getChildren().size() == 2,
+ "Iceberg map column %s must have two children",
column.getName());
+ Column key = column.getChildren().get(0);
+ // element_at(map, key) reads the complete key subtree, while any
path after '*'
+ // describes only the selected value subtree.
+ if (requiresIcebergField(key, fieldById, false, requirement)
+ || requiresProjectedIcebergField(key, fieldById,
requirement)) {
+ return true;
+ }
+ return requiresProjectedIcebergField(
+ column.getChildren().get(1), path, pathIndex + 1,
fieldById, false,
+ requirement);
+ }
+ if (column.getType().isMapType()) {
+ Preconditions.checkState(column.getChildren().size() == 2,
+ "Iceberg map column %s must have two children",
column.getName());
+ int childIndex;
+ if (AccessPathInfo.ACCESS_MAP_KEYS.equals(component)) {
+ childIndex = 0;
+ } else {
+
Preconditions.checkState(AccessPathInfo.ACCESS_MAP_VALUES.equals(component),
+ "Unexpected Iceberg map access path component %s",
component);
+ childIndex = 1;
+ }
+ return requiresProjectedIcebergField(
+ column.getChildren().get(childIndex), path, pathIndex + 1,
fieldById, false,
+ requirement);
+ }
+
+ Column child = findAccessPathChild(column, component);
+ Preconditions.checkState(child != null,
+ "Iceberg access path child %s is absent from column %s",
component,
+ column.getName());
+ return requiresProjectedIcebergField(
+ child, path, pathIndex + 1, fieldById, false, requirement);
+ }
+
+ private static boolean requiresProjectedIcebergField(
+ Column column, Map<Integer, NestedField> fieldById,
+ ProjectedFieldRequirement requirement) {
+ if (column.getChildren() == null) {
+ return false;
+ }
+ for (Column child : column.getChildren()) {
+ if (requiresIcebergField(child, fieldById, false, requirement)
+ || requiresProjectedIcebergField(child, fieldById,
requirement)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ private static boolean requiresIcebergField(
+ Column column, Map<Integer, NestedField> fieldById, boolean
isTopLevel,
+ ProjectedFieldRequirement requirement) {
+ NestedField field = fieldById.get(column.getUniqueId());
+ return field != null && requirement.requires(field, isTopLevel);
+ }
+
+ private interface ProjectedFieldRequirement {
+ boolean requires(NestedField field, boolean isTopLevel);
+ }
+
+ /**
+ * Detect a reused name that current BEs resolve before an older sibling's
historical alias.
+ *
+ * <p>A smooth-upgrade source BE recognizes only the original semantics
marker and performs one
+ * ordered name/alias pass. If a sibling retains another sibling's current
name as an alias, the
+ * two BE generations can bind the same projected path to different field
IDs and types.
+ */
+ @VisibleForTesting
+ static boolean hasCurrentNameAliasCollision(
+ Schema schema, Optional<Map<Integer, List<String>>> nameMapping) {
+ return !getCurrentNameAliasCollisionFieldIds(schema,
nameMapping).isEmpty();
+ }
+
+ @VisibleForTesting
+ static void checkNameMappingBackendCompatibility(
+ Schema schema,
+ List<SlotDescriptor> projectedSlots,
+ Set<Integer> equalityDeleteFieldIds,
+ Optional<Map<Integer, List<String>>> nameMapping,
+ Iterable<Backend> backends) throws UserException {
+ Set<Integer> collisionFieldIds =
+ getCurrentNameAliasCollisionFieldIds(schema, nameMapping);
+ if (collisionFieldIds.isEmpty()) {
+ return;
+ }
+ boolean projectedCollision = requiresProjectedIcebergField(
+ schema, projectedSlots,
+ (field, isTopLevel) ->
collisionFieldIds.contains(field.fieldId()));
+ if (!projectedCollision && !equalityDeleteFieldIds.isEmpty()) {
+ Map<Integer, Integer> parentById =
TypeUtil.indexParents(schema.asStruct());
+ for (Integer equalityDeleteFieldId : equalityDeleteFieldIds) {
+ Integer fieldId = equalityDeleteFieldId;
+ while (fieldId != null) {
+ if (collisionFieldIds.contains(fieldId)) {
+ projectedCollision = true;
+ break;
+ }
+ fieldId = parentById.get(fieldId);
+ }
+ if (projectedCollision) {
+ break;
+ }
+ }
+ }
+ if (projectedCollision) {
+ checkCurrentIcebergScanSemanticsBackendCompatibility(backends);
+ }
+ }
+
+ private static Set<Integer> getCurrentNameAliasCollisionFieldIds(
+ Schema schema, Optional<Map<Integer, List<String>>> nameMapping) {
+ Set<Integer> collisionFieldIds = new HashSet<>();
+ if (nameMapping.isPresent()) {
+ collectCurrentNameAliasCollisionFieldIds(
+ schema.asStruct(), nameMapping.get(), collisionFieldIds);
+ }
+ return collisionFieldIds;
+ }
+
+ private static void collectCurrentNameAliasCollisionFieldIds(
+ Type type, Map<Integer, List<String>> nameMapping,
+ Set<Integer> collisionFieldIds) {
+ switch (type.typeId()) {
+ case STRUCT:
+ List<NestedField> fields = type.asStructType().fields();
+ for (NestedField field : fields) {
+ List<String> aliases =
+ nameMapping.getOrDefault(field.fieldId(),
Collections.emptyList());
+ for (String alias : aliases) {
+ for (NestedField sibling : fields) {
+ if (sibling.fieldId() != field.fieldId()
+ && sibling.name().equalsIgnoreCase(alias))
{
+ collisionFieldIds.add(field.fieldId());
+ collisionFieldIds.add(sibling.fieldId());
+ }
+ }
+ }
+ collectCurrentNameAliasCollisionFieldIds(
+ field.type(), nameMapping, collisionFieldIds);
+ }
+ return;
+ case LIST:
+ collectCurrentNameAliasCollisionFieldIds(
+ type.asListType().elementType(), nameMapping,
collisionFieldIds);
+ return;
+ case MAP:
+ collectCurrentNameAliasCollisionFieldIds(
+ type.asMapType().keyType(), nameMapping,
collisionFieldIds);
+ collectCurrentNameAliasCollisionFieldIds(
+ type.asMapType().valueType(), nameMapping,
collisionFieldIds);
+ return;
+ default:
+ return;
+ }
+ }
+
+ private static boolean matchesAccessPathComponent(Column column, String
component) {
+ return Integer.toString(column.getUniqueId()).equals(component)
+ || column.getName().equalsIgnoreCase(component);
+ }
+
+ private static Column findAccessPathChild(Column column, String component)
{
+ for (Column child : column.getChildren()) {
+ if (matchesAccessPathComponent(child, component)) {
+ return child;
+ }
+ }
+ return null;
+ }
+
+ private static Column findChildByName(Column column, String childName) {
+ for (Column child : column.getChildren()) {
+ if (child.getName().equalsIgnoreCase(childName)) {
+ return child;
+ }
+ }
+ return null;
+ }
+
+ @VisibleForTesting
+ Set<Integer> getEqualityDeleteFieldIdsForScan() throws UserException {
+ TableScan scan = createTableScan();
+ if (scan.snapshot() == null) {
+ return Collections.emptySet();
+ }
+ try {
+ return preExecutionAuthenticator.execute(
+ () -> loadEqualityDeleteFieldIds(scan));
+ } catch (Exception e) {
+ Optional<NotSupportedException> opt =
checkNotSupportedException(e);
+ if (opt.isPresent()) {
+ throw opt.get();
+ }
+ throw new UserException(ExceptionUtils.getRootCauseMessage(e), e);
+ }
+ }
+
+ /**
+ * Skip exhaustive delete-file planning when the exact snapshot summary
already proves that
+ * metadata-only COUNT(*) is safe. A usable count requires the summary's
equality-delete total
+ * to be zero, so no equality field IDs can affect this scan.
+ */
+ @VisibleForTesting
+ Set<Integer> getEqualityDeleteFieldIdsForPlanning() throws UserException {
+ if (prepareTableLevelSnapshotCount()) {
+ return Collections.emptySet();
+ }
+ return getEqualityDeleteFieldIdsForScan();
+ }
+
+ @VisibleForTesting
+ Set<Integer> loadEqualityDeleteFieldIds(TableScan scan) {
+ ConnectContext context = ConnectContext.get();
+ Preconditions.checkNotNull(context);
+ Preconditions.checkNotNull(context.getStatementContext());
+ List<FileScanTask> rewriteTasks =
+ context.getStatementContext().getIcebergRewriteFileScanTasks();
+ if (rewriteTasks != null) {
+ return collectEqualityDeleteFieldIdsFromTasks(rewriteTasks);
+ }
+ long startTime = System.currentTimeMillis();
+ try {
+ List<FileScanTask> tasks = new ArrayList<>();
+ try (CloseableIterable<FileScanTask> plannedTasks =
+ planFileScanTaskWithoutReuse(scan)) {
+ for (FileScanTask task : plannedTasks) {
Review Comment:
[P1] Preserve asynchronous batch planning while collecting equality-delete
field IDs
This loop exhausts `planFileScanTaskWithoutReuse(scan)` and stores every
split `FileScanTask` in an `ArrayList` before
`super.createScanRangeLocations()` can start batch dispatch. In batch mode,
`splitFiles()` is deliberately lazy, but this preflight consumes it
synchronously, so FE planning latency and memory become O(all matching split
tasks). This also happens for ordinary non-empty scans when the snapshot has
zero equality deletes; only an eligible metadata-only `COUNT(*)` skips this
path.
Reusing the exact tasks fixes the correctness mismatch with manifest-cache
dispatch, but it removes the scalability property that batch mode is meant to
provide. Please retain the snapshot-summary zero-equality-delete fast path and
share equality-field discovery with the actual lazy planning pipeline without
materializing every task. Add a test proving that batch task iteration is not
exhausted during `createScanRangeLocations()` (and preferably a
large-task/manifest-read metric assertion), while preserving the exact
delete-to-task contract.
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