Add missing CHECK_FOR_INTERRUPTS in lseg_inside_poly

Apparently, there are bugs in this code that cause it to loop endlessly.
That bug still needs more research, but in the meantime it's clear that
the loop is missing a check for interrupts so that it can be cancelled
timely.

Backpatch to 9.1 -- this has been missing since 49475aab8d0d.

diff --git a/src/backend/utils/adt/geo_ops.c b/src/backend/utils/adt/geo_ops.c
index ca03947bc83b35c50ee751e2ed71d8760e4d4a9c..f7fe27a4fb31bff8bb6c9bc3b4f892e0b193eec6 100644 (file)
--- a/src/backend/utils/adt/geo_ops.c
+++ b/src/backend/utils/adt/geo_ops.c
@@ -20,6 +20,7 @@
 #include <ctype.h>
 
 #include "libpq/pqformat.h"
+#include "miscadmin.h"
 #include "utils/builtins.h"
 #include "utils/geo_decls.h"
 
@@ -3927,6 +3928,8 @@ lseg_inside_poly(Point *a, Point *b, POLYGON *poly, int start)
        {
                Point      *interpt;
 
+               CHECK_FOR_INTERRUPTS();
+
                s.p[1] = poly->p[i];
 
                if (on_ps_internal(t.p, &s))