[CP] fix core at pl parser vsnprintf

src/pl/parser/pl_parser_base.h

@@ -206,4 +206,23 @@ extern const NonReservedKeyword *mysql_pl_non_reserved_keyword_lookup(const char
 // e.g., (int64_t)3.00000000000000001 == 3.00000000000000001 is true;
 // oracle supports up to 40 decimal place precision.
 
+#define ESCAPE_PERCENT_CHARACTER(result, src, dst)\
+do {\
+  if (OB_NOT_NULL(result) && OB_NOT_NULL(src)) {\
+    int64_t src_len = strlen(src);\
+    int64_t dst_len = 2 * src_len + 1;\
+    int64_t pos = 0;\
+    dst = (char *)parse_malloc(dst_len, result->mem_pool_);\
+    if (OB_LIKELY(NULL != dst)) {\
+      for (int64_t i = 0; i < src_len; i++) {\
+        if (src[i] == '%') {\
+          dst[pos++] = '%';\
+        }\
+        dst[pos++] = src[i];\
+      }\
+      dst[pos] = 0;\
+    }\
+  }\
+} while (0)
+
 #endif /* OCEANBASE_SRC_PL_PARSER_PL_PARSER_BASE_H_ */