ogr_recordbatch.h

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
 
// This file is an extract
// https://github.com/apache/arrow/blob/main/cpp/src/arrow/c/abi.h WARNING: DO
// NOT MODIFY the content as it would break interoperability !
 
#pragma once
 
#include <stdint.h>
 
// Spec and documentation: https://arrow.apache.org/docs/format/CDataInterface.html
 
#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
 
#ifndef ARROW_C_STREAM_INTERFACE
#define ARROW_C_STREAM_INTERFACE
 
    struct ArrowArrayStream
    {
        // Callback to get the stream type
        // (will be the same for all arrays in the stream).
        //
        // Return value: 0 if successful, an `errno`-compatible error code otherwise.
        //
        // If successful, the ArrowSchema must be released independently from the stream.
        int (*get_schema)(struct ArrowArrayStream *, struct ArrowSchema *out);
 
        // Callback to get the next array
        // (if no error and the array is released, the stream has ended)
        //
        // Return value: 0 if successful, an `errno`-compatible error code otherwise.
        //
        // If successful, the ArrowArray must be released independently from the stream.
        int (*get_next)(struct ArrowArrayStream *, struct ArrowArray *out);
 
        // Callback to get optional detailed error information.
        // This must only be called if the last stream operation failed
        // with a non-0 return code.
        //
        // Return value: pointer to a null-terminated character array describing
        // the last error, or NULL if no description is available.
        //
        // The returned pointer is only valid until the next operation on this stream
        // (including release).
        const char *(*get_last_error)(struct ArrowArrayStream *);
 
        // Release callback: release the stream's own resources.
        // Note that arrays returned by `get_next` must be individually released.
        void (*release)(struct ArrowArrayStream *);
 
        // Opaque producer-specific data
        void *private_data;
    };
 
#endif  // ARROW_C_STREAM_INTERFACE
 
#ifdef __cplusplus
}
#endif