[tarantool-patches] Re: [PATCH v2 4/5] sql: remove file zErrMsg of struct Parse

["n.pettik" <korablev@tarantool.org>]

> diff --git a/src/box/sql.c b/src/box/sql.c
> index 580f3fa..116e3e8 100644
> --- a/src/box/sql.c
> +++ b/src/box/sql.c
> @@ -1362,13 +1362,8 @@ sql_checks_resolve_space_def_reference(ExprList *expr_list,
> 	parser.parse_only = true;
> 
> 	sql_resolve_self_reference(&parser, def, NC_IsCheck, NULL, expr_list);
> -	int rc = 0;
> -	if (parser.rc != SQL_OK) {
> -		/* Tarantool error may be already set with diag. */
> -		if (parser.rc != SQL_TARANTOOL_ERROR)
> -			diag_set(ClientError, ER_SQL, parser.zErrMsg);
> -		rc = -1;
> -	}
> +	if (parser.rc != SQL_OK)
> +		return -1;

Since now we have only one possible RC, lets remove
its name and simply check (parser.rc != 0).
Or, as suggested Konstantin, better replace rc with bool is_aborted flag.

> 	sql_parser_destroy(&parser);
> -	return rc;
> +	return 0;
> }
> diff --git a/src/box/sql/build.c b/src/box/sql/build.c
> index deb5b89..6afca4a 100644
> --- a/src/box/sql/build.c
> +++ b/src/box/sql/build.c
> @@ -493,16 +493,10 @@ sql_column_add_nullable_action(struct Parse *parser,
> 	struct field_def *field = &def->fields[def->field_count - 1];
> 	if (field->nullable_action != ON_CONFLICT_ACTION_DEFAULT &&
> 	    nullable_action != field->nullable_action) {
> -		/* Prevent defining nullable_action many times. */
> -		const char *err_msg =
> -			tt_sprintf("NULL declaration for column '%s' of table "
> -				   "'%s' has been already set to '%s'",
> -				   field->name, def->name,
> -				   on_conflict_action_strs[field->
> -							   nullable_action]);
> -		diag_set(ClientError, ER_SQL, err_msg);
> -		parser->rc = SQL_TARANTOOL_ERROR;
> -		parser->nErr++;
> +		sqlErrorMsg(parser, "NULL declaration for column '%s' of "\
> +			    "table '%s' has been already set to '%s'",
> +			    field->name, def->name,
> +			    on_conflict_action_strs[field-> nullable_action]);

This looks like step back in our attempt at using diag_set.
We do you need to incapsulate diag into sqlErrorMsg?

> 		return;
> 	}
> 	field->nullable_action = nullable_action;
> diff --git a/src/box/sql/delete.c b/src/box/sql/delete.c
> index 5170c7f..a7bf3b3 100644
> --- a/src/box/sql/delete.c
> +++ b/src/box/sql/delete.c
> @@ -94,31 +94,22 @@ sql_table_truncate(struct Parse *parse, struct SrcList *tab_list)
> 	struct space *space = space_by_name(tab_name);
> 	if (space == NULL) {
> 		diag_set(ClientError, ER_NO_SUCH_SPACE, tab_name);
> -		goto tarantool_error;
> +		sql_parser_error(parse);

Look, anyway you remove this function in next commit.
Next time please consider order of refactoring.

> 	}
> 	if (! rlist_empty(&space->parent_fk_constraint)) {
> -		const char *err_msg =
> -			tt_sprintf("can not truncate space '%s' because other "
> -				   "objects depend on it", space->def->name);
> -		diag_set(ClientError, ER_SQL, err_msg);
> -		goto tarantool_error;
> +		sqlErrorMsg(parse, "can not truncate space '%s' because other "
> +			    "objects depend on it", space->def->name);

Replace invocation of sqlErrorMsg with diag_set + parser->rc.
The same in other places.

> @@ -146,11 +145,7 @@ sqlPrepare(sql * db,	/* Database handle. */
> 		*ppStmt = (sql_stmt *) sParse.pVdbe;
> 	}
> 
> -	if (zErrMsg) {
> -		sqlErrorWithMsg(db, rc, "%s", zErrMsg);
> -	} else {
> -		sqlError(db, rc);
> -	}
> +	sqlError(db, rc);

sqlError seems to be useless/dead. Please, make a note somewhere
to remove it as follow-up to error-refactoring patch-set.