Merge pull request #47 from b41sh/fix-get-by-keypath

fix: fix get by keypath with null value

Author: sundy-li

src/functions.rs

@@ -378,7 +378,7 @@ pub fn get_by_keypath<'a, I: Iterator<Item = &'a KeyPath<'a>>>(
         }
     }
     // If the key paths is empty, return original value.
-    if curr_jentry_encoded == 0 {
+    if curr_val_offset == 0 {
         return Some(value.to_vec());
     }
     curr_jentry

tests/it/functions.rs

@@ -1054,6 +1054,8 @@ fn test_get_by_keypath() {
         ("null", " {  } ", Some(Value::Null)),
         ("null", " { a , b } ", None),
         ("true", "{a,b}", None),
+        (r#"{"a":{"b":null}}"#, "{a,b}", Some(Value::Null)),
+        (r#"[1,"a",null]"#, "{2}", Some(Value::Null)),
         (r#""sdasd""#, "{1}", None),
         ("[10,20,30]", "{1}", Some(Value::Number(Number::UInt64(20)))),
         (