fix: small fixes for parquet reader including RowRanges, PreBuffer, ColumnIndexFilter and code cleanup

src/paimon/format/parquet/column_index_filter.cpp

@@ -96,6 +96,10 @@ Result<RowRanges> ColumnIndexFilter::VisitLeafPredicate(
     const auto& literals = leaf_predicate->Literals();
     FieldType field_type = leaf_predicate->GetFieldType();
 
+    if (function_type != Function::Type::IS_NULL && function_type != Function::Type::IS_NOT_NULL &&
+        literals.empty()) {
+        return RowRanges::CreateSingle(row_group_row_count);
+    }
     std::vector<int32_t> matching_pages;
 
     switch (function_type) {
@@ -106,37 +110,22 @@ Result<RowRanges> ColumnIndexFilter::VisitLeafPredicate(
             matching_pages = FilterPagesByIsNotNull(column_index_ptr);
             break;
         case Function::Type::EQUAL:
-            if (!literals.empty()) {
-                matching_pages = FilterPagesByEqual(column_index_ptr, literals[0], field_type);
-            }
+            matching_pages = FilterPagesByEqual(column_index_ptr, literals[0], field_type);
             break;
         case Function::Type::NOT_EQUAL:
-            if (!literals.empty()) {
-                matching_pages = FilterPagesByNotEqual(column_index_ptr, literals[0], field_type);
-            }
+            matching_pages = FilterPagesByNotEqual(column_index_ptr, literals[0], field_type);
             break;
         case Function::Type::LESS_THAN:
-            if (!literals.empty()) {
-                matching_pages = FilterPagesByLessThan(column_index_ptr, literals[0], field_type);
-            }
+            matching_pages = FilterPagesByLessThan(column_index_ptr, literals[0], field_type);
             break;
         case Function::Type::LESS_OR_EQUAL:
-            if (!literals.empty()) {
-                matching_pages =
-                    FilterPagesByLessOrEqual(column_index_ptr, literals[0], field_type);
-            }
+            matching_pages = FilterPagesByLessOrEqual(column_index_ptr, literals[0], field_type);
             break;
         case Function::Type::GREATER_THAN:
-            if (!literals.empty()) {
-                matching_pages =
-                    FilterPagesByGreaterThan(column_index_ptr, literals[0], field_type);
-            }
+            matching_pages = FilterPagesByGreaterThan(column_index_ptr, literals[0], field_type);
             break;
         case Function::Type::GREATER_OR_EQUAL:
-            if (!literals.empty()) {
-                matching_pages =
-                    FilterPagesByGreaterOrEqual(column_index_ptr, literals[0], field_type);
-            }
+            matching_pages = FilterPagesByGreaterOrEqual(column_index_ptr, literals[0], field_type);
             break;
         case Function::Type::IN:
             matching_pages = FilterPagesByIn(column_index_ptr, literals, field_type);

src/paimon/format/parquet/column_index_filter_test.cpp

@@ -26,6 +26,9 @@
 #include "arrow/c/abi.h"
 #include "arrow/c/bridge.h"
 #include "gtest/gtest.h"
+#include "paimon/common/predicate/equal.h"
+#include "paimon/common/predicate/in.h"
+#include "paimon/common/predicate/leaf_predicate_impl.h"
 #include "paimon/common/utils/arrow/arrow_input_stream_adapter.h"
 #include "paimon/common/utils/arrow/mem_utils.h"
 #include "paimon/defs.h"
@@ -480,4 +483,29 @@ TEST_F(ColumnIndexFilterTest, NullPredicateReturnsAllRows) {
     EXPECT_EQ(row_group_row_count_, ranges.RowCount());
 }
 
+/// When literals is empty for comparison predicates (EQUAL, NOT_EQUAL, LESS_THAN,
+/// LESS_OR_EQUAL, GREATER_THAN, GREATER_OR_EQUAL), the filter should return all
+/// rows (conservative fallback) rather than returning empty ranges.
+TEST_F(ColumnIndexFilterTest, EmptyLiteralsReturnsAllRows) {
+    // Construct a LeafPredicate with EQUAL function but empty literals vector.
+    // This simulates the edge case where literals are unexpectedly empty.
+    auto pred = std::make_shared<paimon::LeafPredicateImpl>(paimon::Equal::Instance(), 0, "val",
+                                                            FieldType::INT, std::vector<Literal>());
+    ASSERT_OK_AND_ASSIGN(auto ranges, Filter(pred));
+    // With empty literals, the filter cannot evaluate the comparison,
+    // so it should conservatively return all rows.
+    EXPECT_EQ(row_group_row_count_, ranges.RowCount());
+}
+
+/// Empty literals for IN predicate — the early guard in VisitLeafPredicate treats
+/// all non-IS_NULL/IS_NOT_NULL predicates with empty literals conservatively,
+/// returning all rows rather than risking incorrect filtering.
+TEST_F(ColumnIndexFilterTest, EmptyLiteralsInReturnsAllRows) {
+    auto pred = std::make_shared<paimon::LeafPredicateImpl>(paimon::In::Instance(), 0, "val",
+                                                            FieldType::INT, std::vector<Literal>());
+    ASSERT_OK_AND_ASSIGN(auto ranges, Filter(pred));
+    // Empty literals → conservative fallback → all rows.
+    EXPECT_EQ(row_group_row_count_, ranges.RowCount());
+}
+
 }  // namespace paimon::parquet::test

src/paimon/format/parquet/file_reader_wrapper.cpp

@@ -26,23 +26,13 @@
 #include "fmt/format.h"
 #include "paimon/format/parquet/column_index_filter.h"
 #include "paimon/format/parquet/page_filtered_row_group_reader.h"
+#include "paimon/format/parquet/parquet_format_defs.h"
 #include "paimon/macros.h"
 #include "parquet/arrow/reader.h"
 #include "parquet/file_reader.h"
 #include "parquet/metadata.h"
 #include "parquet/page_index.h"
 
-// Convert any std::exception thrown by underlying Parquet/Arrow APIs into a
-// Status. Used as the trailing catch clauses of a try block in every public
-// method that calls into the parquet C++ API, so the read layer never throws.
-#define PAIMON_PARQUET_CATCH_AND_RETURN_STATUS(context)                     \
-    catch (const std::exception& e) {                                       \
-        return Status::Invalid(fmt::format("{}: {}", (context), e.what())); \
-    }                                                                       \
-    catch (...) {                                                           \
-        return Status::UnknownError((context), ": unknown error");          \
-    }
-
 namespace paimon::parquet {
 
 namespace {

src/paimon/format/parquet/page_filtered_row_group_reader.cpp

@@ -249,6 +249,8 @@ Result<std::unique_ptr<arrow::RecordBatchReader>> PageFilteredRowGroupReader::Re
                 // Pre-buffering failed, fall back to row-group level PreBuffer
                 ::arrow::io::IOContext io_ctx(pool);
                 parquet_reader->PreBuffer(rg_vec, col_vec, io_ctx, cache_options);
+                PAIMON_RETURN_NOT_OK_FROM_ARROW(
+                    parquet_reader->WhenBuffered(rg_vec, col_vec).status());
             }
         } else {
             PAIMON_RETURN_NOT_OK_FROM_ARROW(parquet_reader->WhenBuffered(rg_vec, col_vec).status());

src/paimon/format/parquet/parquet_file_batch_reader.cpp

@@ -48,17 +48,6 @@
 #include "parquet/arrow/reader.h"
 #include "parquet/properties.h"
 
-// Convert any std::exception thrown by underlying Parquet/Arrow APIs into a
-// Status. Used as the trailing catch clauses of a try block in every public
-// method that calls into the parquet C++ API, so the read layer never throws.
-#define PAIMON_PARQUET_CATCH_AND_RETURN_STATUS(context)                     \
-    catch (const std::exception& e) {                                       \
-        return Status::Invalid(fmt::format("{}: {}", (context), e.what())); \
-    }                                                                       \
-    catch (...) {                                                           \
-        return Status::UnknownError((context), ": unknown error");          \
-    }
-
 namespace arrow {
 class MemoryPool;
 }  // namespace arrow
@@ -159,18 +148,6 @@ Status ParquetFileBatchReader::SetReadSchema(
             }
         }
 
-        // Build column name to index map for page-level filtering.
-        // For leaf columns, indices[0] is the correct leaf column index in Parquet.
-        // For nested types (struct/list/map), FlattenSchema produces multiple leaf indices,
-        // but predicate pushdown only targets leaf columns with simple types, so indices[0]
-        // is always the correct single leaf index for predicate evaluation.
-        std::map<std::string, int32_t> column_name_to_index;
-        for (const auto& [name, indices] : field_index_map) {
-            if (!indices.empty()) {
-                column_name_to_index[name] = indices[0];
-            }
-        }
-
         std::vector<int32_t> row_groups = arrow::internal::Iota(reader_->GetNumberOfRowGroups());
         if (predicate) {
             PAIMON_ASSIGN_OR_RAISE(row_groups,
@@ -188,6 +165,18 @@ Status ParquetFileBatchReader::SetReadSchema(
                 OptionsUtils::GetValueFromMap<bool>(options_, PARQUET_READ_ENABLE_PAGE_INDEX_FILTER,
                                                     DEFAULT_PARQUET_READ_ENABLE_PAGE_INDEX_FILTER));
             if (enable_page_index_filter) {
+                // Build column name to index map for page-level filtering.
+                // For leaf columns, indices[0] is the correct leaf column index in Parquet.
+                // For nested types (struct/list/map), FlattenSchema produces multiple leaf indices,
+                // but predicate pushdown only targets leaf columns with simple types, so indices[0]
+                // is always the correct single leaf index for predicate evaluation.
+                std::map<std::string, int32_t> column_name_to_index;
+                for (const auto& [name, indices] : field_index_map) {
+                    if (!indices.empty()) {
+                        column_name_to_index[name] = indices[0];
+                    }
+                }
+
                 PAIMON_ASSIGN_OR_RAISE(
                     auto page_filter_result,
                     FilterRowGroupsByPageIndex(predicate, column_name_to_index, row_groups));

src/paimon/format/parquet/parquet_format_defs.h

@@ -19,6 +19,17 @@
 #include <cstdint>
 #include <limits>
 
+// Convert any std::exception thrown by underlying Parquet/Arrow APIs into a
+// Status. Used as the trailing catch clauses of a try block in every public
+// method that calls into the parquet C++ API, so the read layer never throws.
+#define PAIMON_PARQUET_CATCH_AND_RETURN_STATUS(context)                     \
+    catch (const std::exception& e) {                                       \
+        return Status::Invalid(fmt::format("{}: {}", (context), e.what())); \
+    }                                                                       \
+    catch (...) {                                                           \
+        return Status::UnknownError((context), ": unknown error");          \
+    }
+
 namespace paimon::parquet {
 
 // write

src/paimon/format/parquet/row_ranges.h

@@ -43,6 +43,9 @@ class RowRanges {
     /// Creates a RowRanges from a list of ranges.
     explicit RowRanges(const std::vector<Range>& ranges) : ranges_(ranges) {}
 
+    /// Creates a RowRanges from a list of ranges, taking ownership of the vector.
+    explicit RowRanges(std::vector<Range>&& ranges) : ranges_(std::move(ranges)) {}
+
     /// Creates a RowRanges with a single range [0, row_count - 1].
     static RowRanges CreateSingle(int64_t row_count) {
         if (row_count <= 0) {