higuoxing opened a new pull request, #612:
URL: https://github.com/apache/madlib/pull/612

   This patch fixes 2 compilation errors:
   
   1. Incomplete type: forget to include the header file `<array>`
   
   ```
   
/home/v/workspace/madlib/src/ports/greenplum/dbconnector/../../postgres/dbconnector/Allocator_impl.hpp:78:50:
 error: 'std::array<long unsigned int, 1> numElements' has incomplete type
      78 |         std::array<std::size_t, BOOST_PP_INC(n)> numElements = {{ \
         |                                                  ^~~~~~~~~~~
   ```
   
   2. `snprintf` gets expanded to `pg_snprintf` in PostgreSQL/Greenplum.
   
   ```
   In file included from 
/home/v/.local/gpdb7/include/postgresql/server/c.h:1330,
                    from 
/home/v/.local/gpdb7/include/postgresql/server/postgres.h:46,
                    from 
/home/v/workspace/madlib/src/ports/greenplum/dbconnector/dbconnector.hpp:16:
   /usr/include/boost/assert/source_location.hpp: In member function 
'std::string boost::source_location::to_string() const':
   /usr/include/boost/assert/source_location.hpp:97:9: error: 'pg_snprintf' is 
not a member of 'std'; did you mean 'vsnprintf'?
      97 |         BOOST_ASSERT_SNPRINTF( buffer, ":%lu", ln );
         |         ^~~~~~~~~~~~~~~~~~~~~
   /usr/include/boost/assert/source_location.hpp:104:13: error: 'pg_snprintf' 
is not a member of 'std'; did you mean 'vsnprintf'?
     104 |             BOOST_ASSERT_SNPRINTF( buffer, ":%lu", co );
         |             ^~~~~~~~~~~~~~~~~~~~~
   ```
   
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