Add support to prepare Bitmapset directly from String

Author: Dipesh Dhameliya

src/backend/nodes/read.c

@@ -22,6 +22,7 @@
 #include <ctype.h>
 
 #include "common/string.h"
+#include "nodes/bitmapset.h"
 #include "nodes/pg_list.h"
 #include "nodes/readfuncs.h"
 #include "nodes/value.h"
@@ -478,3 +479,20 @@ nodeRead(const char *token, int tok_len)
 
 	return (void *) result;
 }
+
+/*
+ * Helper function for Babelfish to build Bitmapset from string.
+ */
+Bitmapset *
+stringToBms(const char *str)
+{
+	Bitmapset *ret;
+	const char *save_strtok;
+
+	save_strtok = pg_strtok_ptr;
+	pg_strtok_ptr = str;		/* point pg_strtok at the string to read */
+
+	ret = readBitmapset();
+	pg_strtok_ptr = save_strtok;
+	return ret;
+}

src/include/nodes/nodes.h

@@ -654,6 +654,7 @@ extern bool *readBoolCols(int numCols);
 extern int *readIntCols(int numCols);
 extern Oid *readOidCols(int numCols);
 extern int16 *readAttrNumberCols(int numCols);
+extern struct Bitmapset *stringToBms(const char *str);
 
 /*
  * nodes/copyfuncs.c