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104 lines
3.1 KiB
C
104 lines
3.1 KiB
C
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define ARROW_FLAG_DICTIONARY_ORDERED 1
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#define ARROW_FLAG_NULLABLE 2
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#define ARROW_FLAG_MAP_KEYS_SORTED 4
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struct ArrowSchema {
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// Array type description
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const char* format;
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const char* name;
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const char* metadata;
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int64_t flags;
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int64_t n_children;
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struct ArrowSchema** children;
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struct ArrowSchema* dictionary;
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// Release callback
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void (*release)(struct ArrowSchema*);
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// Opaque producer-specific data
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void* private_data;
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};
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struct ArrowArray {
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// Array data description
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int64_t length;
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int64_t null_count;
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int64_t offset;
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int64_t n_buffers;
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int64_t n_children;
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const void** buffers;
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struct ArrowArray** children;
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struct ArrowArray* dictionary;
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// Release callback
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void (*release)(struct ArrowArray*);
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// Opaque producer-specific data
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void* private_data;
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};
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// EXPERIMENTAL: C stream interface
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struct ArrowArrayStream {
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// Callback to get the stream type
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// (will be the same for all arrays in the stream).
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//
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// Return value: 0 if successful, an `errno`-compatible error code otherwise.
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//
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// If successful, the ArrowSchema must be released independently from the stream.
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int (*get_schema)(struct ArrowArrayStream*, struct ArrowSchema* out);
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// Callback to get the next array
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// (if no error and the array is released, the stream has ended)
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//
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// Return value: 0 if successful, an `errno`-compatible error code otherwise.
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//
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// If successful, the ArrowArray must be released independently from the stream.
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int (*get_next)(struct ArrowArrayStream*, struct ArrowArray* out);
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// Callback to get optional detailed error information.
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// This must only be called if the last stream operation failed
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// with a non-0 return code.
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//
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// Return value: pointer to a null-terminated character array describing
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// the last error, or NULL if no description is available.
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//
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// The returned pointer is only valid until the next operation on this stream
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// (including release).
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const char* (*get_last_error)(struct ArrowArrayStream*);
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// Release callback: release the stream's own resources.
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// Note that arrays returned by `get_next` must be individually released.
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void (*release)(struct ArrowArrayStream*);
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// Opaque producer-specific data
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void* private_data;
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};
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#ifdef __cplusplus
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}
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#endif
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