MDEV-27911: Implement range notation for json path

Range can be thought about in similar manner as wildcard (*) where
more than one elements are processed. To implement range notation, extended
json parser to parse the 'to' keyword and added JSON_PATH_ARRAY_RANGE for
path type. If there is 'to' keyword then use JSON_PATH_ARRAY range for
path type along with existing type.
This new integer to store the end index of range is n_item_end.
When there is 'to' keyword, store the integer in n_item_end else store in
n_item.

1 files changed, 3 insertions, 1 deletions

diff --git a/include/json_lib.h b/include/json_lib.h
index 41ab88b06ce..1f12487d7e8 100644
--- a/include/json_lib.h
+++ b/include/json_lib.h
@@ -84,7 +84,8 @@ enum json_path_step_types
   JSON_PATH_KEY_DOUBLEWILD= 1+8,
   JSON_PATH_ARRAY_WILD= 2+4,
   JSON_PATH_ARRAY_DOUBLEWILD= 2+8,
-  JSON_PATH_NEGATIVE_INDEX= 16
+  JSON_PATH_NEGATIVE_INDEX= 16,
+  JSON_PATH_ARRAY_RANGE= 32
 };
 
 
@@ -95,6 +96,7 @@ typedef struct st_json_path_step_t
   const uchar *key; /* Pointer to the beginning of the key. */
   const uchar *key_end;  /* Pointer to the end of the key. */
   int n_item;  /* Item number in an array. No meaning for the key step. */
+  int n_item_end; /* Last index of the range. */
 } json_path_step_t;