[Function](ELT)Add elt function (#12321)

2022-09-07 15:21:08 +08:00
parent f2923f9180
commit 09b45f2b71
11 changed files with 256 additions and 0 deletions
--- a/be/src/exprs/string_functions.cpp
+++ b/be/src/exprs/string_functions.cpp
@ -682,6 +682,15 @@ StringVal StringFunctions::concat_ws(FunctionContext* context, const StringVal&
    return result;
 }

+StringVal StringFunctions::elt(FunctionContext* context, const IntVal& pos, int num_children,
+                               const StringVal* strs) {
+    if (pos.is_null || pos.val < 1 || num_children == 0 || pos.val > num_children) {
+        return StringVal::null();
+    }
+
+    return strs[pos.val - 1];
+}
+
 IntVal StringFunctions::find_in_set(FunctionContext* context, const StringVal& str,
                                    const StringVal& str_set) {
    if (str.is_null || str_set.is_null) {