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fix: invalidate table scan schema cache #758

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Merged
wgtmac merged 2 commits into from
Jun 28, 2026
Merged

fix: invalidate table scan schema cache #758

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5e67c6c
Fix table scan snapshot schema cache invalidation
fallintoplace Jun 18, 2026
2cf4293
fix: defer scan stats schema resolution
fallintoplace Jun 27, 2026
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37 changes: 25 additions & 12 deletions src/iceberg/table_scan.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -239,24 +239,16 @@ TableScanBuilder<ScanType>& TableScanBuilder<ScanType>::CaseSensitive(
template <typename ScanType>
TableScanBuilder<ScanType>& TableScanBuilder<ScanType>::IncludeColumnStats() {
context_.return_column_stats = true;
context_.columns_to_keep_stats.clear();
requested_column_stats_.reset();
return *this;
}

template <typename ScanType>
TableScanBuilder<ScanType>& TableScanBuilder<ScanType>::IncludeColumnStats(
const std::vector<std::string>& requested_columns) {
context_.return_column_stats = true;
context_.columns_to_keep_stats.clear();
context_.columns_to_keep_stats.reserve(requested_columns.size());

ICEBERG_BUILDER_ASSIGN_OR_RETURN(auto schema_ref, ResolveSnapshotSchema());
const auto& schema = schema_ref.get();
for (const auto& column_name : requested_columns) {
ICEBERG_BUILDER_ASSIGN_OR_RETURN(auto field, schema->FindFieldByName(column_name));
if (field.has_value()) {
context_.columns_to_keep_stats.insert(field.value().get().field_id());
}
}
requested_column_stats_ = requested_columns;

return *this;
}
Expand Down Expand Up @@ -301,7 +293,6 @@ TableScanBuilder<ScanType>& TableScanBuilder<ScanType>::UseSnapshot(int64_t snap
template <typename ScanType>
TableScanBuilder<ScanType>& TableScanBuilder<ScanType>::UseRef(const std::string& ref) {
if (ref == SnapshotRef::kMainBranch) {
snapshot_schema_ = nullptr;
context_.snapshot_id.reset();
return *this;
}
Expand Down Expand Up @@ -390,6 +381,27 @@ TableScanBuilder<ScanType>& TableScanBuilder<ScanType>::UseBranch(
return *this;
}

template <typename ScanType>
Status TableScanBuilder<ScanType>::ResolveColumnStatsSelection() {
if (!requested_column_stats_.has_value()) {
return {};
}

context_.columns_to_keep_stats.clear();
context_.columns_to_keep_stats.reserve(requested_column_stats_->size());

ICEBERG_ASSIGN_OR_RAISE(auto schema_ref, ResolveSnapshotSchema());
const auto& schema = schema_ref.get();
for (const auto& column_name : *requested_column_stats_) {
ICEBERG_ASSIGN_OR_RAISE(auto field, schema->FindFieldByName(column_name));
if (field.has_value()) {
context_.columns_to_keep_stats.insert(field.value().get().field_id());
}
}

return {};
}

template <typename ScanType>
Result<std::reference_wrapper<const std::shared_ptr<Schema>>>
TableScanBuilder<ScanType>::ResolveSnapshotSchema() {
Expand All @@ -410,6 +422,7 @@ TableScanBuilder<ScanType>::ResolveSnapshotSchema() {
template <typename ScanType>
Result<std::unique_ptr<ScanType>> TableScanBuilder<ScanType>::Build() {
ICEBERG_RETURN_UNEXPECTED(CheckErrors());
ICEBERG_RETURN_UNEXPECTED(ResolveColumnStatsSelection());
ICEBERG_RETURN_UNEXPECTED(context_.Validate());

ICEBERG_ASSIGN_OR_RAISE(auto schema, ResolveSnapshotSchema());
Expand Down
2 changes: 2 additions & 0 deletions src/iceberg/table_scan.h
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Expand Up @@ -384,11 +384,13 @@ class ICEBERG_TEMPLATE_CLASS_EXPORT TableScanBuilder : public ErrorCollector {

// Return the schema bound to the specified snapshot.
Result<std::reference_wrapper<const std::shared_ptr<Schema>>> ResolveSnapshotSchema();
Status ResolveColumnStatsSelection();

std::shared_ptr<TableMetadata> metadata_;
std::shared_ptr<FileIO> io_;
internal::TableScanContext context_;
std::shared_ptr<Schema> snapshot_schema_;
std::optional<std::vector<std::string>> requested_column_stats_;
};

/// \brief Represents a configured scan operation on a table.
Expand Down
54 changes: 54 additions & 0 deletions src/iceberg/test/table_scan_test.cc
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Expand Up @@ -230,6 +230,60 @@ TEST_P(TableScanTest, UseRefPreservesInt64SnapshotIds) {
EXPECT_EQ(snapshot->snapshot_id, kLargeSnapshotId);
}

TEST_P(TableScanTest, IncludeColumnStatsUsesFinalSnapshotSchema) {
constexpr int64_t kBaseSnapshotId = 1000L;
constexpr int64_t kEvolvedSnapshotId = 2000L;
constexpr int32_t kBaseIdFieldId = 1;
constexpr int32_t kEvolvedIdFieldId = 10;
constexpr int32_t kEvolvedDataFieldId = 11;
constexpr int32_t kEvolvedSchemaId = 1;

auto evolved_schema = std::make_shared<Schema>(
std::vector<SchemaField>{
SchemaField::MakeRequired(kEvolvedIdFieldId, "id", int32()),
SchemaField::MakeRequired(kEvolvedDataFieldId, "data", string())},
kEvolvedSchemaId);
table_metadata_->schemas.push_back(evolved_schema);
table_metadata_->last_column_id = kEvolvedDataFieldId;
table_metadata_->snapshots.push_back(std::make_shared<Snapshot>(
Snapshot{.snapshot_id = kEvolvedSnapshotId,
.parent_snapshot_id = kBaseSnapshotId,
.sequence_number = 2L,
.timestamp_ms = TimePointMsFromUnixMs(1609459201000L),
.manifest_list = "/tmp/metadata/snap-2000-2-manifest-list.avro",
.schema_id = evolved_schema->schema_id()}));
table_metadata_->refs["evolved-branch"] = std::make_shared<SnapshotRef>(
SnapshotRef{.snapshot_id = kEvolvedSnapshotId, .retention = SnapshotRef::Branch{}});

{
ICEBERG_UNWRAP_OR_FAIL(auto builder,
DataTableScanBuilder::Make(table_metadata_, file_io_));
builder->IncludeColumnStats({"id"}).UseSnapshot(kEvolvedSnapshotId);
ICEBERG_UNWRAP_OR_FAIL(auto scan, builder->Build());
ICEBERG_UNWRAP_OR_FAIL(auto scan_schema, scan->schema());

EXPECT_EQ(scan_schema->schema_id(), evolved_schema->schema_id());
const auto& stats_fields = scan->context().columns_to_keep_stats;
EXPECT_EQ(stats_fields.size(), 1);
EXPECT_TRUE(stats_fields.contains(kEvolvedIdFieldId));
EXPECT_FALSE(stats_fields.contains(kBaseIdFieldId));
}

{
ICEBERG_UNWRAP_OR_FAIL(auto builder,
DataTableScanBuilder::Make(table_metadata_, file_io_));
builder->IncludeColumnStats({"id"}).UseRef("evolved-branch");
ICEBERG_UNWRAP_OR_FAIL(auto scan, builder->Build());
ICEBERG_UNWRAP_OR_FAIL(auto scan_schema, scan->schema());

EXPECT_EQ(scan_schema->schema_id(), evolved_schema->schema_id());
const auto& stats_fields = scan->context().columns_to_keep_stats;
EXPECT_EQ(stats_fields.size(), 1);
EXPECT_TRUE(stats_fields.contains(kEvolvedIdFieldId));
EXPECT_FALSE(stats_fields.contains(kBaseIdFieldId));
}
}

TEST_P(TableScanTest, TableScanBuilderValidationErrors) {
// Test negative min rows
ICEBERG_UNWRAP_OR_FAIL(auto builder,
Expand Down
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