Fix linux crash

Makefile

@@ -34,9 +34,10 @@ SHLIB_LINK := $(LIBS)
 PGXS := $(shell $(PG_CONFIG) --pgxs)
 include $(PGXS)
 
-PG_VERSION_NUM = $(shell awk '/PG_VERSION_NUM/ { print $$3 }' $(shell $(PG_CONFIG) --includedir-server)/pg_config.h)
+PG_VERSION_NUM = $(shell pg_config --version | cut -f2 -d' ' | awk -F. '{printf "%d%04d", $$1, $$2}')
 HAS_IMPORT_SCHEMA = $(shell [ $(PG_VERSION_NUM) -ge 90500 ] && echo yes)
 
+
 # order matters, file first, import last
 REGRESS = file pgsql
 ifeq ($(HAS_IMPORT_SCHEMA),yes)

ogr_fdw.c

@@ -1663,7 +1663,7 @@ pgDatumFromCString(const char* cstr, const OgrFdwColumn *col, int char_encoding,
 	char *cstr_decoded;
 
 	/* Zero length implies NULL for all non-strings */
-	if (cstr_len == 0 && col->ogrfldtype != OFTString)
+	if (cstr_len == 0 && (col->ogrfldtype != OFTString && col->ogrfldtype != OFTStringList))
 	{
 		*is_null = true;
 		return value;

output/pgsql.source

@@ -215,11 +215,11 @@ CREATE FOREIGN TABLE array_fdw (
   b boolean[]
 ) SERVER pgserver OPTIONS (layer 'array_local');
 SELECT fid, txt, int, flt, b FROM array_fdw;
- fid |      txt       |    int    |      flt      |   b   
------+----------------+-----------+---------------+-------
-   1 | {Jim}          | {1,2,3}   | {3.4,5.6,7.8} | {t,f}
-   2 | {Jim,NULL,Joe} | {1,3,0,4} | {4.5,0,3.4}   | {f,f}
-   3 |                |           |               | 
+ fid |     txt      |    int    |      flt      |   b   
+-----+--------------+-----------+---------------+-------
+   1 | {Jim}        | {1,2,3}   | {3.4,5.6,7.8} | {t,f}
+   2 | {Jim,"",Joe} | {1,3,0,4} | {4.5,0,3.4}   | {f,f}
+   3 |              |           |               | 
 (3 rows)
 
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