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[opt_stats]: Fix online_osg bugs

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This commit is contained in:
Monk-Liu
2023-03-02 17:41:48 +00:00
committed by ob-robot
parent f0cbd4582a
commit f1d066b4bd
17 changed files with 181 additions and 123 deletions
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41
src/sql/optimizer/ob_optimizer_util.cpp
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@ -8611,3 +8611,44 @@ int ObOptimizerUtil::replace_gen_column(ObLogPlan *log_plan, ObRawExpr *part_exp
}
return ret;
}
int ObOptimizerUtil::truncate_string_for_opt_stats(const ObObj *old_obj,
ObIAllocator &alloc,
const ObObj *&new_obj)
{
int ret = OB_SUCCESS;
bool is_truncated = false;
if (old_obj->is_string_type()) {
ObString str;
if (OB_FAIL(old_obj->get_string(str))) {
LOG_WARN("failed to get string", K(ret), K(str));
} else {
int64_t mb_len = ObCharset::strlen_char(old_obj->get_collation_type(), str.ptr(), str.length());
if (mb_len <= OPT_STATS_MAX_VALUE_CHAR_LEN) {
} else {
//need truncate string, because the opt stats is gathered after truncate string, such as: max_value、min_value、histogram.
ObObj *tmp_obj = NULL;
if (OB_ISNULL(tmp_obj = static_cast<ObObj*>(alloc.alloc(sizeof(ObObj))))) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("fail to alloc buf", K(ret));
} else {
int64_t valid_len = ObCharset::charpos(old_obj->get_collation_type(), str.ptr(),
str.length(), OPT_STATS_MAX_VALUE_CHAR_LEN);
if (OB_UNLIKELY(valid_len <= 0)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected error", K(ret), K(valid_len), K(str), K(OPT_STATS_MAX_VALUE_CHAR_LEN));
} else {
tmp_obj->set_varchar(str.ptr(), valid_len);
tmp_obj->set_meta_type(old_obj->get_meta());
new_obj = tmp_obj;
is_truncated = true;
}
}
}
}
}
if (OB_SUCC(ret) && !is_truncated) {
new_obj = old_obj;
}
return ret;
}