[tarantool-patches] Re: [PATCH 2/2] sql: compute resulting collation for concatenation
n.pettik
korablev at tarantool.org
Fri Feb 22 16:40:58 MSK 2019
>>>> + bool is_rhs_forced;
>>>> + uint32_t rhs_coll_id;
>>>> + if (sql_expr_coll(parse, p->pRight, &is_rhs_forced,
>>>> + &rhs_coll_id) != 0)
>>>> + return -1;
>>>> + if (is_lhs_forced && is_rhs_forced) {
>>>> + if (lhs_coll_id != rhs_coll_id)
>>>> + return -1;
>>>
>>> 5. Did you miss diag_set?
>> No, I did it on purpose. Firstly, this function is recursive,
>> so in case error occurred on bottom levels of recursion,
>> diag would be reseted on each level above (and parser’s
>> counter of errors would be incremented several times as
>> well). No terrible consequences would take place in this case,
>> but it looks like a bad pattern. Anyway, fixed it according to
>> your suggestion.
>
> Each ClientError is accounted in a global errors counter. It
> means, that the same error should be set multiple times, otherwise
> the statistics would be wrong. Instead of resetting diag each time
> check if parser->nErr > 0, and if it is, then do nothing.
> diag_is_empty() can not be used, because it happens sometimes, that
> there are no errors, but diag is not cleared from a previous error.
Hmm, Mergen is trying to remove nErr, if I’m not mistaken.
So, soon I guess we will be able to use diag_is_empty().
Now I’ve implemented your suggestion. Diff:
diff --git a/src/box/sql/expr.c b/src/box/sql/expr.c
index 680075792..0de9a46a5 100644
--- a/src/box/sql/expr.c
+++ b/src/box/sql/expr.c
@@ -246,10 +246,17 @@ sql_expr_coll(Parse *parse, Expr *p, bool *is_explicit_coll, uint32_t *coll_id,
return -1;
if (is_lhs_forced && is_rhs_forced) {
if (lhs_coll_id != rhs_coll_id) {
- diag_set(ClientError,
- ER_ILLEGAL_COLLATION_MIX);
- parse->nErr++;
- parse->rc = SQL_TARANTOOL_ERROR;
+ /*
+ * Don't set the same error
+ * several times: this
+ * function is recursive.
+ */
+ if (parse->nErr == 0) {
+ diag_set(ClientError,
+ ER_ILLEGAL_COLLATION_MIX);
+ parse->nErr++;
+ parse->rc = SQL_TARANTOOL_ERROR;
+ }
return -1;
}
}
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