paleolimbot commented on code in PR #578:
URL: https://github.com/apache/arrow-nanoarrow/pull/578#discussion_r1712051964


##########
src/nanoarrow/common/array.c:
##########
@@ -1335,3 +1335,177 @@ ArrowErrorCode ArrowArrayViewValidate(struct 
ArrowArrayView* array_view,
   ArrowErrorSet(error, "validation_level not recognized");
   return EINVAL;
 }
+
+struct ArrowComparisonInternalState {
+  enum ArrowCompareLevel level;
+  int is_equal;
+  struct ArrowBuffer path;
+  struct ArrowError reason;
+};
+
+#define RETURN_NOT_EQUAL_IMPL(state_, path_size_, cond_, reason_) \
+  do {                                                            \
+    if (cond_) {                                                  \
+      ArrowErrorSet(&state_->reason, "%s", reason_);              \
+      state_->path.size_bytes = (path_size_);                     \
+      state_->is_equal = 0;                                       \
+      return NANOARROW_OK;                                        \
+    }                                                             \
+  } while (0)
+
+#define RETURN_NOT_EQUAL(state_, path_size_, condition_) \
+  RETURN_NOT_EQUAL_IMPL(state_, path_size_, condition_, #condition_)
+
+static ArrowErrorCode ArrowArrayViewCompareStructure(
+    const struct ArrowArrayView* actual, const struct ArrowArrayView* expected,
+    struct ArrowComparisonInternalState* state) {
+  int64_t path_size = state->path.size_bytes;
+
+  RETURN_NOT_EQUAL(state, path_size, actual->storage_type != 
expected->storage_type);
+  RETURN_NOT_EQUAL(state, path_size, actual->n_children != 
expected->n_children);
+  RETURN_NOT_EQUAL(state, path_size,
+                   actual->dictionary == NULL && expected->dictionary != NULL);
+  RETURN_NOT_EQUAL(state, path_size,
+                   actual->dictionary != NULL && expected->dictionary == NULL);
+

Review Comment:
   I removed the "structure" checker since it's intent wasn't clear and the 
check we need to avoid invalid access on `children` or `dictionary` further 
down is fairly compact.



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