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ARROW-67: C++ metadata flatbuffer serialization and data movement to …
…memory maps Several things here: * Add Google flatbuffers dependency * Flatbuffers IDL draft in collaboration with @jacques-n and @StevenMPhillips * Add Schema wrapper in Cython * arrow::Schema conversion to/from flatbuffer representation * Remove unneeded physical layout types from type.h * Refactor ListType to be a nested type with a single child * Implement shared memory round-trip for numeric row batches * mmap-based shared memory interface and MemorySource abstract API Quite a bit of judicious code cleaning and consolidation as part of this. For example, List types are now internally equivalent to a nested type with 1 named child field (versus a struct, which can have any number of child fields). Associated JIRAs: ARROW-48, ARROW-57, ARROW-58 Author: Wes McKinney <wesm@apache.org> Closes #28 from wesm/cpp-ipc-draft and squashes the following commits: 0cef7ea [Wes McKinney] Add NullArray type now that Array is virtual, fix pyarrow build 5e841f7 [Wes McKinney] Create explicit PrimitiveArray subclasses to avoid unwanted template instantiation 6fa6319 [Wes McKinney] ARROW-28: Draft C++ shared memory IPC workflow and related refactoring / scaffolding / cleaning.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| # | ||
| # Licensed 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. | ||
| # | ||
| # Tries to find Flatbuffers headers and libraries. | ||
| # | ||
| # Usage of this module as follows: | ||
| # | ||
| # find_package(Flatbuffers) | ||
| # | ||
| # Variables used by this module, they can change the default behaviour and need | ||
| # to be set before calling find_package: | ||
| # | ||
| # Flatbuffers_HOME - | ||
| # When set, this path is inspected instead of standard library locations as | ||
| # the root of the Flatbuffers installation. The environment variable | ||
| # FLATBUFFERS_HOME overrides this veriable. | ||
| # | ||
| # This module defines | ||
| # FLATBUFFERS_INCLUDE_DIR, directory containing headers | ||
| # FLATBUFFERS_LIBS, directory containing flatbuffers libraries | ||
| # FLATBUFFERS_STATIC_LIB, path to libflatbuffers.a | ||
| # FLATBUFFERS_FOUND, whether flatbuffers has been found | ||
|
|
||
| if( NOT "$ENV{FLATBUFFERS_HOME}" STREQUAL "") | ||
| file( TO_CMAKE_PATH "$ENV{FLATBUFFERS_HOME}" _native_path ) | ||
| list( APPEND _flatbuffers_roots ${_native_path} ) | ||
| elseif ( Flatbuffers_HOME ) | ||
| list( APPEND _flatbuffers_roots ${Flatbuffers_HOME} ) | ||
| endif() | ||
|
|
||
| # Try the parameterized roots, if they exist | ||
| if ( _flatbuffers_roots ) | ||
| find_path( FLATBUFFERS_INCLUDE_DIR NAMES flatbuffers/flatbuffers.h | ||
| PATHS ${_flatbuffers_roots} NO_DEFAULT_PATH | ||
| PATH_SUFFIXES "include" ) | ||
| find_library( FLATBUFFERS_LIBRARIES NAMES flatbuffers | ||
| PATHS ${_flatbuffers_roots} NO_DEFAULT_PATH | ||
| PATH_SUFFIXES "lib" ) | ||
| else () | ||
| find_path( FLATBUFFERS_INCLUDE_DIR NAMES flatbuffers/flatbuffers.h ) | ||
| find_library( FLATBUFFERS_LIBRARIES NAMES flatbuffers ) | ||
| endif () | ||
|
|
||
| find_program(FLATBUFFERS_COMPILER flatc | ||
| $ENV{FLATBUFFERS_HOME}/bin | ||
| /usr/local/bin | ||
| /usr/bin | ||
| NO_DEFAULT_PATH | ||
| ) | ||
|
|
||
| if (FLATBUFFERS_INCLUDE_DIR AND FLATBUFFERS_LIBRARIES) | ||
| set(FLATBUFFERS_FOUND TRUE) | ||
| get_filename_component( FLATBUFFERS_LIBS ${FLATBUFFERS_LIBRARIES} PATH ) | ||
| set(FLATBUFFERS_LIB_NAME libflatbuffers) | ||
| set(FLATBUFFERS_STATIC_LIB ${FLATBUFFERS_LIBS}/${FLATBUFFERS_LIB_NAME}.a) | ||
| else () | ||
| set(FLATBUFFERS_FOUND FALSE) | ||
| endif () | ||
|
|
||
| if (FLATBUFFERS_FOUND) | ||
| if (NOT Flatbuffers_FIND_QUIETLY) | ||
| message(STATUS "Found the Flatbuffers library: ${FLATBUFFERS_LIBRARIES}") | ||
| endif () | ||
| else () | ||
| if (NOT Flatbuffers_FIND_QUIETLY) | ||
| set(FLATBUFFERS_ERR_MSG "Could not find the Flatbuffers library. Looked in ") | ||
| if ( _flatbuffers_roots ) | ||
| set(FLATBUFFERS_ERR_MSG "${FLATBUFFERS_ERR_MSG} in ${_flatbuffers_roots}.") | ||
| else () | ||
| set(FLATBUFFERS_ERR_MSG "${FLATBUFFERS_ERR_MSG} system search paths.") | ||
| endif () | ||
| if (Flatbuffers_FIND_REQUIRED) | ||
| message(FATAL_ERROR "${FLATBUFFERS_ERR_MSG}") | ||
| else (Flatbuffers_FIND_REQUIRED) | ||
| message(STATUS "${FLATBUFFERS_ERR_MSG}") | ||
| endif (Flatbuffers_FIND_REQUIRED) | ||
| endif () | ||
| endif () | ||
|
|
||
| mark_as_advanced( | ||
| FLATBUFFERS_INCLUDE_DIR | ||
| FLATBUFFERS_LIBS | ||
| FLATBUFFERS_STATIC_LIB | ||
| FLATBUFFERS_COMPILER | ||
| ) |
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