jorisvandenbossche commented on code in PR #41494:
URL: https://github.com/apache/arrow/pull/41494#discussion_r1587437033
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python/CMakeLists.txt:
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@@ -265,11 +246,44 @@ message(STATUS "NumPy include dir: ${NUMPY_INCLUDE_DIRS}")
include(UseCython)
-# PyArrow C++
+# Arrow C++ and set default PyArrow build options
include(GNUInstallDirs)
-
find_package(Arrow REQUIRED)
+# Top level cmake dir
+if("${CMAKE_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_SOURCE_DIR}")
Review Comment:
@kou for my education, could you explain what this `if` check is exactly
doing or why we need it?
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