Add rocksdb_property_int_cf (#5268)

Summary:
Adds the missing `rocksdb_property_int_cf` function to the C API to let consuming libraries avoid parsing strings.
Fixes https://github.com/facebook/rocksdb/issues/5249
Pull Request resolved: https://github.com/facebook/rocksdb/pull/5268

Differential Revision: D15149461

Pulled By: maysamyabandeh

fbshipit-source-id: e9fe5f1ad7c64066d921dba8473507269b51d331

db/c.cc

@@ -1070,6 +1070,18 @@ int rocksdb_property_int(
   }
 }
 
+int rocksdb_property_int_cf(
+    rocksdb_t* db,
+    rocksdb_column_family_handle_t* column_family,
+    const char* propname,
+    uint64_t *out_val) {
+  if (db->rep->GetIntProperty(column_family->rep, Slice(propname), out_val)) {
+    return 0;
+  } else {
+    return -1;
+  }
+}
+
 char* rocksdb_property_value_cf(
     rocksdb_t* db,
     rocksdb_column_family_handle_t* column_family,

include/rocksdb/c.h

@@ -336,6 +336,11 @@ int rocksdb_property_int(
     rocksdb_t* db,
     const char* propname, uint64_t *out_val);
 
+/* returns 0 on success, -1 otherwise */
+int rocksdb_property_int_cf(
+    rocksdb_t* db, rocksdb_column_family_handle_t* column_family,
+    const char* propname, uint64_t *out_val);
+
 extern ROCKSDB_LIBRARY_API char* rocksdb_property_value_cf(
     rocksdb_t* db, rocksdb_column_family_handle_t* column_family,
     const char* propname);