arrow.h

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#pragma once
 
// The Arrow C data interface.
// https://arrow.apache.org/docs/format/CDataInterface.html
 
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifndef ARROW_C_DATA_INTERFACE
#define ARROW_C_DATA_INTERFACE
 
#define ARROW_FLAG_DICTIONARY_ORDERED 1
#define ARROW_FLAG_NULLABLE 2
#define ARROW_FLAG_MAP_KEYS_SORTED 4
 
struct ArrowSchema {
 // Array type description
 const char* format;
 const char* name;
 const char* metadata;
 int64_t flags;
 int64_t n_children;
 struct ArrowSchema** children;
 struct ArrowSchema* dictionary;
 
 // Release callback
 void (*release)(struct ArrowSchema*);
 // Opaque producer-specific data
 void* private_data;
};
 
struct ArrowArray {
 // Array data description
 int64_t length;
 int64_t null_count;
 int64_t offset;
 int64_t n_buffers;
 int64_t n_children;
 const void** buffers;
 struct ArrowArray** children;
 struct ArrowArray* dictionary;
 
 // Release callback
 void (*release)(struct ArrowArray*);
 // Opaque producer-specific data
 void* private_data;
};
 
#endif // ARROW_C_DATA_INTERFACE
 
#ifdef __cplusplus
}
#endif
 
struct ArrowSchemaWrapper : public ArrowSchema {
 ArrowSchemaWrapper() { release = nullptr; }
 ~ArrowSchemaWrapper() {
 if (release) {
 release(this);
 }
 }
};
 
struct ArrowArrayWrapper : public ArrowArray {
 ArrowArrayWrapper() { release = nullptr; }
 ~ArrowArrayWrapper() {
 if (release) {
 release(this);
 }
 }
};