feat(silo): arrow length returns int64_t

Author: anna-parker

src/silo/query_engine/actions/action.cpp

@@ -347,7 +347,7 @@ arrow::Result<arrow::acero::ExecNode*> Action::addRandomizeColumn(
             SILO_ASSERT_NE(rows_in_batch, arrow::Datum::kUnknownLength);
 
             arrow::UInt64Builder randomize_column_builder;
-            for (size_t i = 0; i < rows_in_batch; ++i) {
+            for (int64_t i = 0; i < rows_in_batch; ++i) {
                uint64_t hash = hash64(start_of_batch + i, randomize_seed);
                ARROW_RETURN_NOT_OK(randomize_column_builder.Append(hash));
             }

src/silo/query_engine/exec_node/throttled_batch_reslicer.h

@@ -16,7 +16,7 @@ using arrow::acero::BackpressureMonitor;
 
 class ThrottledBatchReslicer {
    arrow::AsyncGenerator<std::optional<arrow::ExecBatch>> input_batches;
-   size_t batch_size;
+   int64_t batch_size;
    std::chrono::milliseconds target_batch_rate;
    BackpressureMonitor* backpressure_monitor;
 
@@ -29,7 +29,7 @@ class ThrottledBatchReslicer {
   public:
    ThrottledBatchReslicer(
       arrow::AsyncGenerator<std::optional<arrow::ExecBatch>> input_batches,
-      size_t batch_size,
+      int64_t batch_size,
       std::chrono::milliseconds target_batch_rate,
       BackpressureMonitor* backpressure_monitor
    )