feat: add snapshot util

Author: zhjwpku

src/iceberg/CMakeLists.txt

@@ -81,6 +81,7 @@ set(ICEBERG_SOURCES
     util/decimal.cc
     util/gzip_internal.cc
     util/murmurhash3_internal.cc
+    util/snapshot_util.cc
     util/temporal_util.cc
     util/timepoint.cc
     util/truncate_util.cc

src/iceberg/meson.build

@@ -103,6 +103,7 @@ iceberg_sources = files(
     'util/decimal.cc',
     'util/gzip_internal.cc',
     'util/murmurhash3_internal.cc',
+    'util/snapshot_util.cc',
     'util/temporal_util.cc',
     'util/timepoint.cc',
     'util/truncate_util.cc',

src/iceberg/table.cc

@@ -120,6 +120,8 @@ std::unique_ptr<Transaction> Table::NewTransaction() const {
 
 const std::shared_ptr<FileIO>& Table::io() const { return io_; }
 
+const std::shared_ptr<TableMetadata>& Table::metadata() const { return metadata_; }
+
 std::unique_ptr<TableScanBuilder> Table::NewScan() const {
   return std::make_unique<TableScanBuilder>(metadata_, io_);
 }

src/iceberg/test/CMakeLists.txt

@@ -65,6 +65,7 @@ add_iceberg_test(schema_test
                  sort_field_test.cc
                  sort_order_test.cc
                  snapshot_test.cc
+                 snapshot_util_test.cc
                  schema_util_test.cc)
 
 add_iceberg_test(table_test