commit | 12be163269f3c1b27a09c58c58ba388acbd36b86 | [log] [tgz] |
---|---|---|
author | Dewey Dunnington <dewey@dunnington.ca> | Tue Dec 19 10:14:12 2023 -0400 |
committer | GitHub <noreply@github.com> | Tue Dec 19 10:14:12 2023 -0400 |
tree | c6309e2b0396d7ec346ec6a97b87fdcb6d3a0d1e | |
parent | dfe700f0e366af6fdb335952df2cb47af75624cc [diff] |
feat: Add C Data integration test shared library (#337) This PR adds the shared library target required by the archery integration tetster, based on https://github.com/apache/arrow/blob/main/cpp/src/arrow/integration/c_data_integration_internal.cc . I haven't tested this via archery because I have no idea how to do so (the implementation names and file locations seem hard-coded?); however, it does add a googletest file with some minimal examples to at least make sure everything is wired up. --------- Co-authored-by: Antoine Pitrou <pitrou@free.fr>
The nanoarrow library is a set of helper functions to interpret and generate Arrow C Data Interface and Arrow C Stream Interface structures. The library is in active early development and users should update regularly from the main branch of this repository.
Whereas the current suite of Arrow implementations provide the basis for a comprehensive data analysis toolkit, this library is intended to support clients that wish to produce or interpret Arrow C Data and/or Arrow C Stream structures where linking to a higher level Arrow binding is difficult or impossible.
The nanoarrow C library is intended to be copied and vendored. This can be done using CMake or by using the bundled nanoarrow.h/nanorrow.c distribution available in the dist/ directory in this repository. Examples of both can be found in the examples/ directory in this repository.
A simple producer example:
#include "nanoarrow.h" int make_simple_array(struct ArrowArray* array_out, struct ArrowSchema* schema_out) { struct ArrowError error; array_out->release = NULL; schema_out->release = NULL; NANOARROW_RETURN_NOT_OK(ArrowArrayInitFromType(array_out, NANOARROW_TYPE_INT32)); NANOARROW_RETURN_NOT_OK(ArrowArrayStartAppending(array_out)); NANOARROW_RETURN_NOT_OK(ArrowArrayAppendInt(array_out, 1)); NANOARROW_RETURN_NOT_OK(ArrowArrayAppendInt(array_out, 2)); NANOARROW_RETURN_NOT_OK(ArrowArrayAppendInt(array_out, 3)); NANOARROW_RETURN_NOT_OK(ArrowArrayFinishBuildingDefault(array_out, &error)); NANOARROW_RETURN_NOT_OK(ArrowSchemaInitFromType(schema_out, NANOARROW_TYPE_INT32)); return NANOARROW_OK; }
A simple consumer example:
#include <stdio.h> #include "nanoarrow.h" int print_simple_array(struct ArrowArray* array, struct ArrowSchema* schema) { struct ArrowError error; struct ArrowArrayView array_view; NANOARROW_RETURN_NOT_OK(ArrowArrayViewInitFromSchema(&array_view, schema, &error)); if (array_view.storage_type != NANOARROW_TYPE_INT32) { printf("Array has storage that is not int32\n"); } int result = ArrowArrayViewSetArray(&array_view, array, &error); if (result != NANOARROW_OK) { ArrowArrayViewReset(&array_view); return result; } for (int64_t i = 0; i < array->length; i++) { printf("%d\n", (int)ArrowArrayViewGetIntUnsafe(&array_view, i)); } ArrowArrayViewReset(&array_view); return NANOARROW_OK; }