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oceanbase/src/sql/engine/expr/ob_expr_find_in_set.cpp
jingtaoye35 e537a0c479 [FEAT MERGE] 424 SQL compatibility patch 433 
Co-authored-by: wjhh2008 <wjh2006-1@163.com>
Co-authored-by: GongYusen <986957406@qq.com>
Co-authored-by: hy-guo <fqboyg@gmail.com>
2024-08-23 03:32:02 +00:00

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/**
* Copyright (c) 2021 OceanBase
* OceanBase CE is licensed under Mulan PubL v2.
* You can use this software according to the terms and conditions of the Mulan PubL v2.
* You may obtain a copy of Mulan PubL v2 at:
* http://license.coscl.org.cn/MulanPubL-2.0
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
* See the Mulan PubL v2 for more details.
*/
#define USING_LOG_PREFIX SQL_ENG
#include "sql/engine/expr/ob_expr_find_in_set.h"
#include "lib/charset/ob_charset.h"
#include "sql/ob_sql_utils.h"
#include "sql/engine/ob_exec_context.h"
using namespace oceanbase::common;
namespace oceanbase
{
namespace sql
{
ObExprFindInSet::ObExprFindInSet(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_FIND_IN_SET, "find_in_set", 2, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
{
}
ObExprFindInSet::~ObExprFindInSet()
{
}
int ObExprFindInSet::calc_result_type2(ObExprResType &type,
ObExprResType &type1,
ObExprResType &type2,
ObExprTypeCtx &type_ctx) const
{
int ret = OB_SUCCESS;
if (OB_LIKELY(NOT_ROW_DIMENSION == row_dimension_)) {
type.set_uint64();
type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObUInt64Type].precision_);
type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY[ObUInt64Type].scale_);
type.set_calc_type(ObVarcharType);
ObExprOperator::calc_result_flag2(type, type1, type2);
ObObjMeta coll_types[2];
coll_types[0] = type1.get_obj_meta();
coll_types[1] = type2.get_obj_meta();
if (OB_FAIL(aggregate_charsets_for_comparison(type.get_calc_meta(), coll_types, 2, type_ctx))) {
LOG_WARN("failed to aggregate_charsets_for_comparison", K(ret));
} else {
type1.set_calc_type(ObVarcharType);
type1.set_calc_collation(type);
type2.set_calc_type(ObVarcharType);
type2.set_calc_collation(type);
}
} else {
ret = OB_ERR_INVALID_TYPE_FOR_OP;
}
return ret;
}
int search(const ObString &str, const ObString &str_list, const ObCollationType &cs_type,
uint64_t &res_pos)
{
int ret = OB_SUCCESS;
const char* first_ptr = str.ptr();
int64_t first_length = str.length();
// if first input string contains ',', return 0
if (ObCharset::locate(cs_type, first_ptr, first_length, ",", 1, 1) != 0) {
res_pos = 0;
} else {
int64_t str_list_pos = 0;
int64_t comma_pos = 0;
int64_t elem_idx = 1;
ObString comma_str = ObCharsetUtils::get_const_str(cs_type, ',');
while (str_list_pos < str_list.length()) {
comma_pos = ObCharset::instrb(cs_type,
str_list.ptr() + str_list_pos,
str_list.length() - str_list_pos,
comma_str.ptr(),
comma_str.length());
const char* elem_ptr = str_list.ptr() + str_list_pos;
int64_t elem_length = (comma_pos >= 0) ? comma_pos : (str_list.length() - str_list_pos);
if (0 != ObCharset::strcmp(cs_type, elem_ptr, elem_length, str.ptr(), str.length())) {
//not match
str_list_pos += elem_length + ((comma_pos >= 0) ? comma_str.length() : 0);
elem_idx++;
} else {
break;
}
}
if (str_list_pos < str_list.length()
|| (str_list_pos == str_list.length() && 0 == str.length() && comma_pos > 0)) {
res_pos = elem_idx;
} else {
res_pos = 0;
}
}
return ret;
}
int add_to_hashmap(ObExprFindIntCachedValue &cached_value, ObString &sort_key, int64_t elem_idx)
{
int ret = OB_SUCCESS;
uint64_t value = 0;
if (OB_SUCC(cached_value.get_hashmap().get_refactored(sort_key, value))) {
//do nothing
} else if (OB_LIKELY(OB_HASH_NOT_EXIST == ret)) {
ret = OB_SUCCESS;
OZ (cached_value.get_hashmap().set_refactored(sort_key, elem_idx));
} else {
LOG_WARN("unexpected error", K(ret));
}
return ret;
}
int gen_sortkey(ObCollationType cs_type, ObIAllocator &allocator, ObString &elem, ObString &sort_key) {
int ret = OB_SUCCESS;
if (elem.empty()) {
sort_key = ObString();
} else if (ObCharset::is_bin_sort(cs_type)) {
sort_key = elem;
} else {
bool is_valid_character = false;
const ObCharsetInfo *cs = ObCharset::get_charset(cs_type);
size_t buf_len = cs->coll->strnxfrmlen(cs, elem.length()) * cs->mbmaxlen;
ObArrayWrap<char> buffer;
OZ (buffer.allocate_array(allocator, buf_len));
if (OB_SUCC(ret)) {
size_t sort_key_len = ObCharset::sortkey(cs_type, elem.ptr(), elem.length(),
buffer.get_data(), buf_len, is_valid_character);
if (OB_UNLIKELY(!is_valid_character)) {
ret = OB_ERR_INCORRECT_STRING_VALUE;
} else {
sort_key.assign_ptr(buffer.get_data(), sort_key_len);
}
}
}
return ret;
}
int build_hashmap(ObEvalCtx &ctx,
ObExprFindIntCachedValue &cached_value,
const ObString &str_list,
const ObCollationType &cs_type) {
int ret = OB_SUCCESS;
int64_t str_list_pos = 0;
int64_t comma_pos = 0;
ObString comma_str = ObCharsetUtils::get_const_str(cs_type, ',');
ObMemAttr mem_attr(MTL_ID(), "HashMap");
ObArray<ObString> sortkeys;
OZ (sortkeys.reserve(16));
while (OB_SUCC(ret) && str_list_pos < str_list.length()) {
comma_pos = ObCharset::instrb(cs_type,
str_list.ptr() + str_list_pos,
str_list.length() - str_list_pos,
comma_str.ptr(),
comma_str.length());
const char* elem_ptr = str_list.ptr() + str_list_pos;
int64_t elem_length = (comma_pos >= 0) ? comma_pos : (str_list.length() - str_list_pos);
ObString sort_key;
ObString elem(elem_length, elem_ptr);
OZ (gen_sortkey(cs_type, ctx.exec_ctx_.get_allocator(), elem, sort_key));
OZ (sortkeys.push_back(sort_key));
if (OB_SUCC(ret)) {
str_list_pos += elem_length + ((comma_pos >= 0) ? comma_str.length() : 0);
}
}
if (OB_SUCC(ret) && comma_pos > 0) {
OZ (sortkeys.push_back(ObString()));
}
if (OB_UNLIKELY(OB_ERR_INCORRECT_STRING_VALUE == ret)) {
ret = OB_SUCCESS;
ObString temp_str;
bool is_null = false;
ObSQLUtils::check_well_formed_str(str_list, cs_type, temp_str, is_null, true); //generate warning
}
OZ (cached_value.get_hashmap().create(MAX(16, sortkeys.count() * 2), mem_attr, mem_attr));
for (int i = 0; OB_SUCC(ret) && i < sortkeys.count(); i++) {
OZ (add_to_hashmap(cached_value, sortkeys.at(i), i + 1));
}
return ret;
}
int search_with_const_set(const ObExpr &expr,
ObEvalCtx &ctx,
const ObString &str,
const ObString &str_list,
const ObCollationType &cs_type,
uint64_t &res_pos)
{
int ret = OB_SUCCESS;
const char* first_ptr = str.ptr();
int64_t first_length = str.length();
// if first input string contains ',', return 0
if (ObCharset::locate(cs_type, first_ptr, first_length, ",", 1, 1) != 0) {
res_pos = 0;
} else {
auto rt_ctx_id = static_cast<uint64_t>(expr.expr_ctx_id_);
ObExprFindIntCachedValue *cached_value = NULL;
if (NULL == (cached_value = static_cast<ObExprFindIntCachedValue *>
(ctx.exec_ctx_.get_expr_op_ctx(rt_ctx_id)))) {
if (OB_FAIL(ctx.exec_ctx_.create_expr_op_ctx(rt_ctx_id, cached_value))) {
LOG_WARN("failed to create operator ctx", K(ret));
} else {
OZ (build_hashmap(ctx, *cached_value, str_list, cs_type));
}
}
if (OB_SUCC(ret)) {
ObEvalCtx::TempAllocGuard tmp_alloc_g(ctx);
common::ObArenaAllocator &temp_allocator = tmp_alloc_g.get_allocator();
ObString sort_key;
ObString input = str;
if (OB_FAIL(gen_sortkey(cs_type, temp_allocator, input, sort_key))) {
res_pos = 0;
if (OB_ERR_INCORRECT_STRING_VALUE == ret) {
ret = OB_SUCCESS;
} else {
LOG_WARN("fail to get sort key", K(ret));
}
} else if (OB_FAIL(cached_value->get_hashmap().get_refactored(sort_key, res_pos))) {
if (OB_HASH_NOT_EXIST == ret) {
ret = OB_SUCCESS;
res_pos = 0;
} else {
LOG_WARN("fail to get from hash map", K(ret));
}
}
}
}
return ret;
}
int ObExprFindInSet::calc_find_in_set_expr(const ObExpr &expr, ObEvalCtx &ctx,
ObDatum &res_datum)
{
int ret = OB_SUCCESS;
// find_in_set(str, strlist)
ObDatum *str = NULL;
ObDatum *strlist = NULL;
if (OB_UNLIKELY(2 != expr.arg_cnt_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected arg cnt", K(ret));
} else if (OB_FAIL(expr.eval_param_value(ctx, str, strlist))) {
LOG_WARN("eval arg failed", K(ret));
} else if (str->is_null() || strlist->is_null()) {
res_datum.set_null();
} else {
const ObCollationType &cs_type = expr.args_[0]->datum_meta_.cs_type_;
uint64_t res_pos = 0;
if (OB_UNLIKELY(expr.args_[0]->datum_meta_.cs_type_ != expr.args_[1]->datum_meta_.cs_type_ ||
!ObCharset::is_valid_collation(static_cast<int64_t>(cs_type)))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid cs_type", K(ret), K(cs_type));
} else {
if (expr.args_[1]->is_static_const_) {
ret = search_with_const_set(expr, ctx, str->get_string(), strlist->get_string(), cs_type, res_pos);
} else {
ret = search(str->get_string(), strlist->get_string(), cs_type, res_pos);
}
if (OB_FAIL(ret)) {
LOG_WARN("search str in str list failed", K(ret), K(expr.args_[1]->is_static_const_));
} else {
res_datum.set_uint(res_pos);
}
}
}
return ret;
}
int ObExprFindInSet::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
ObExpr &rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(expr_cg_ctx);
UNUSED(raw_expr);
rt_expr.eval_func_ = calc_find_in_set_expr;
return ret;
}
DEF_SET_LOCAL_SESSION_VARS(ObExprFindInSet, raw_expr) {
int ret = OB_SUCCESS;
SET_LOCAL_SYSVAR_CAPACITY(1);
EXPR_ADD_LOCAL_SYSVAR(share::SYS_VAR_COLLATION_CONNECTION);
return ret;
}
} /* namespace sql */
} /* namespace oceanbase */
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