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feat: hemar: separate jsonb_get_by_path form postgresql

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yukkop
2025-05-17 14:30:18 +00:00
parent 86d30ea494
commit eabfbbdc95
1 changed files with 66 additions and 49 deletions
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115
package/c/hemar/hemar.c
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@@ -23,6 +23,7 @@
static void template_node_to_string(TemplateNode *node, StringInfo result, int indent); static void template_node_to_string(TemplateNode *node, StringInfo result, int indent);
static void render_template(TemplateNode *node, Jsonb *define, StringInfo result, MemoryContext context); static void render_template(TemplateNode *node, Jsonb *define, StringInfo result, MemoryContext context);
static void render_execute_tag(const char *code, Jsonb *define, StringInfo result, MemoryContext context); static void render_execute_tag(const char *code, Jsonb *define, StringInfo result, MemoryContext context);
static JsonbValue *jsonb_get_by_path_internal(Jsonb *jb, const char *path_str, MemoryContext context);
static const char * static const char *
jbt_type_to_string(JsonbIteratorToken type) jbt_type_to_string(JsonbIteratorToken type)
@@ -1490,17 +1491,14 @@ parse_path_string(const char *path_str, int *num_segments)
} }
/* /*
* Get JSONB value by path * Internal function to get JSONB value by path
* Input: JSONB document and path string * Input: JSONB document, path string, and memory context
* Output: JSONB value at the specified path or NULL if path is invalid * Output: JsonbValue at the specified path or NULL if path is invalid
* Note: The returned JsonbValue is allocated in the provided context
*/ */
Datum static JsonbValue *
pg_jsonb_get_by_path(PG_FUNCTION_ARGS) jsonb_get_by_path_internal(Jsonb *jb, const char *path_str, MemoryContext context)
{ {
Jsonb *jb = PG_GETARG_JSONB_P(0);
text *path_text = PG_GETARG_TEXT_PP(1);
char *path_str = text_to_cstring(path_text);
JsonbValue *result = NULL; JsonbValue *result = NULL;
JsonbValue tmp_val; JsonbValue tmp_val;
JsonbIterator *it; JsonbIterator *it;
@@ -1519,8 +1517,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
if (path_str == NULL || *path_str == '\0') if (path_str == NULL || *path_str == '\0')
{ {
elog(WARNING, "path is empty, returning NULL"); elog(WARNING, "path is empty, returning NULL");
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
/* Parse the path string */ /* Parse the path string */
@@ -1530,9 +1527,8 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
{ {
/* Free allocated memory before returning */ /* Free allocated memory before returning */
elog(WARNING, "no segments in path, returning NULL"); elog(WARNING, "no segments in path, returning NULL");
pfree(path_str);
pfree(segments); pfree(segments);
PG_RETURN_NULL(); return NULL;
} }
/* Start iterating through the JSONB document */ /* Start iterating through the JSONB document */
@@ -1550,8 +1546,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
} }
else if (token == WJB_BEGIN_OBJECT) else if (token == WJB_BEGIN_OBJECT)
@@ -1565,8 +1560,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
} }
else else
@@ -1577,8 +1571,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
/* Process each path segment */ /* Process each path segment */
@@ -1597,8 +1590,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
/* Extract the array index */ /* Extract the array index */
@@ -1610,8 +1602,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
/* Navigate to the specified array element */ /* Navigate to the specified array element */
@@ -1632,7 +1623,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
if (current_segment == num_segments - 1) if (current_segment == num_segments - 1)
{ {
/* Create a standalone JsonbValue for the result */ /* Create a standalone JsonbValue for the result */
result = palloc(sizeof(JsonbValue)); result = MemoryContextAlloc(context, sizeof(JsonbValue));
*result = v; *result = v;
/* Convert to a Jsonb container */ /* Convert to a Jsonb container */
@@ -1651,10 +1642,8 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str);
/* Return the result as a new Jsonb */ return result;
PG_RETURN_JSONB_P(JsonbValueToJsonb(&tmp_val));
} }
/* Not the last segment, continue traversing */ /* Not the last segment, continue traversing */
@@ -1680,9 +1669,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
} }
@@ -1713,9 +1700,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
/* If we found the element and broke out of the loop to process the next segment, /* If we found the element and broke out of the loop to process the next segment,
@@ -1734,9 +1719,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
/* Navigate to the specified field */ /* Navigate to the specified field */
@@ -1753,8 +1736,6 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str);
ereport(ERROR, ereport(ERROR,
(errcode(ERRCODE_INTERNAL_ERROR), (errcode(ERRCODE_INTERNAL_ERROR),
errmsg("unexpected JSONB iterator token"))); errmsg("unexpected JSONB iterator token")));
@@ -1774,7 +1755,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
if (current_segment == num_segments - 1) if (current_segment == num_segments - 1)
{ {
/* Create a standalone JsonbValue for the result */ /* Create a standalone JsonbValue for the result */
result = palloc(sizeof(JsonbValue)); result = MemoryContextAlloc(context, sizeof(JsonbValue));
*result = v; *result = v;
/* Convert to a Jsonb container */ /* Convert to a Jsonb container */
@@ -1793,10 +1774,8 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str);
/* Return the result as a new Jsonb */ return result;
PG_RETURN_JSONB_P(JsonbValueToJsonb(&tmp_val));
} }
/* Not the last segment, continue traversing */ /* Not the last segment, continue traversing */
@@ -1822,9 +1801,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
} }
else else
@@ -1858,9 +1835,7 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
pfree(path_str); return NULL;
PG_RETURN_NULL();
} }
/* If we found the field and broke out of the loop to process the next segment, /* If we found the field and broke out of the loop to process the next segment,
@@ -1878,7 +1853,49 @@ pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
for (i = 0; i < num_segments; i++) for (i = 0; i < num_segments; i++)
pfree(segments[i]); pfree(segments[i]);
pfree(segments); pfree(segments);
return NULL;
}
/*
* Get JSONB value by path
* Input: JSONB document and path string
* Output: JSONB value at the specified path or NULL if path is invalid
*/
Datum
pg_jsonb_get_by_path(PG_FUNCTION_ARGS)
{
Jsonb *jb = PG_GETARG_JSONB_P(0);
text *path_text = PG_GETARG_TEXT_PP(1);
char *path_str = text_to_cstring(path_text);
JsonbValue *result;
JsonbValue tmp_val;
/* Use the internal function to get the value */
result = jsonb_get_by_path_internal(jb, path_str, CurrentMemoryContext);
if (result == NULL)
{
pfree(path_str);
PG_RETURN_NULL();
}
/* Convert to a Jsonb container */
if (result->type == jbvBinary)
{
tmp_val.type = jbvBinary;
tmp_val.val.binary.data = result->val.binary.data;
tmp_val.val.binary.len = result->val.binary.len;
}
else
{
tmp_val = *result;
}
/* Free allocated memory */
pfree(result);
pfree(path_str); pfree(path_str);
PG_RETURN_NULL(); /* Return the result as a new Jsonb */
PG_RETURN_JSONB_P(JsonbValueToJsonb(&tmp_val));
} }