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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_concat.h"
#include <string.h>
#include "lib/oblog/ob_log.h"
//#include "share/object/ob_obj_cast.h"
#include "objit/common/ob_item_type.h"
//#include "sql/engine/expr/ob_expr_promotion_util.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/engine/expr/ob_expr_lob_utils.h"
namespace oceanbase
{
using namespace common;
namespace sql
{
ObExprConcat::ObExprConcat(ObIAllocator &alloc)
: ObStringExprOperator(alloc, T_OP_CNN, N_CONCAT, MORE_THAN_ZERO, VALID_FOR_GENERATED_COL)
{
need_charset_convert_ = false;
}
ObExprConcat::~ObExprConcat()
{
}
int ObExprConcat::calc(ObObj &result, const ObObj &obj1, const ObObj &obj2,
ObIAllocator *allocator, const ObObjType result_type, bool is_oracle_mode,
const int64_t max_result_len)
{
int ret = OB_SUCCESS;
if (is_oracle_mode) {
if (obj1.is_null() && obj2.is_null()) {
result.set_null();
} else {
ObString str1;
ObString str2;
if (!obj1.is_null()) {
str1 = obj1.get_string();
}
if (!obj2.is_null()) {
str2 = obj2.get_string();
}
if (ob_is_text_tc(result_type)) {
OZ (calc_text(result, obj1, obj2, allocator));
} else {
OZ (calc(result, str1, str2, allocator, is_oracle_mode, max_result_len));
}
}
} else {
if (OB_UNLIKELY(obj1.is_null()) ||
OB_UNLIKELY(obj2.is_null())) {
result.set_null();
} else if (OB_UNLIKELY(obj1.is_text() || obj2.is_text())) {
ret = calc_text(result, obj1, obj2, allocator);
} else {
TYPE_CHECK(obj1, ObVarcharType);
TYPE_CHECK(obj2, ObVarcharType);
ObString str1 = obj1.get_string();
ObString str2 = obj2.get_string();
ret = calc(result, str1, str2, allocator, false, 0);
}
if (OB_FAIL(ret)) {
LOG_WARN("concat error", K(ret), K(is_oracle_mode), K(obj1), K(obj2));
}
}
return ret;
}
// text tc
int ObExprConcat::calc_text(common::ObObj &result,
const common::ObObj obj1,
const common::ObObj obj2,
ObIAllocator *allocator)
{
int ret = OB_SUCCESS;
int32_t max_length = OB_MAX_PACKET_LENGTH;
// use a temp allocator to read lob data, the input allocator may not alloc more then once
common::ObArenaAllocator temp_allocator(ObModIds::OB_LOB_READER, OB_MALLOC_NORMAL_BLOCK_SIZE, MTL_ID());
ObTextStringIter str_iter1(obj1);
ObTextStringIter str_iter2(obj2);
int64_t str1_byte_len = 0;
int64_t str2_byte_len = 0;
if (OB_FAIL(str_iter1.init(0, NULL, &temp_allocator))) {
LOG_WARN("init str_iter1 failed ", K(ret), K(str_iter1));
} else if (OB_FAIL(str_iter2.init(0, NULL, &temp_allocator))) {
LOG_WARN("init str_iter2 failed ", K(ret), K(str_iter2));
} else if (OB_FAIL(str_iter1.get_byte_len(str1_byte_len))) {
LOG_WARN("init str_iter1 failed ", K(ret), K(str_iter1));
} else if (OB_FAIL(str_iter2.get_byte_len(str2_byte_len))) {
LOG_WARN("init str_iter1 failed ", K(ret), K(str_iter2));
} else {
bool has_lob_header = obj1.has_lob_header() || obj2.has_lob_header();
ObTextStringResult tmp_lob(ObLongTextType, has_lob_header, allocator);
int64_t res_data_byte_len = str1_byte_len + str2_byte_len;
if (OB_UNLIKELY(res_data_byte_len > max_length)) {
result.set_null();
ret = OB_SIZE_OVERFLOW;
LOG_WARN("length overflow", K(ret), K(str1_byte_len), K(str2_byte_len), K(max_length));
} else if (OB_FAIL(tmp_lob.init(res_data_byte_len))) {
LOG_WARN("init tmp lob failed", K(ret), K(res_data_byte_len));
} else {
ObTextStringIterState state;
ObString src_block_data;
while (OB_SUCC(ret)
&& (state = str_iter1.get_next_block(src_block_data)) == TEXTSTRING_ITER_NEXT) {
if (OB_FAIL(tmp_lob.append(src_block_data))) {
LOG_WARN("output_result append failed", K(ret), K(src_block_data));
}
}
if (OB_FAIL(ret)) {
} else if (state != TEXTSTRING_ITER_NEXT && state != TEXTSTRING_ITER_END) {
ret = (str_iter1.get_inner_ret() != OB_SUCCESS) ?
str_iter1.get_inner_ret() : OB_INVALID_DATA;
LOG_WARN("iter state invalid", K(ret), K(state), K(str_iter1));
}
while (OB_SUCC(ret)
&& (state = str_iter2.get_next_block(src_block_data)) == TEXTSTRING_ITER_NEXT) {
if (OB_FAIL(tmp_lob.append(src_block_data))) {
LOG_WARN("output_result append failed", K(ret), K(src_block_data));
}
}
if (OB_FAIL(ret)) {
} else if (state != TEXTSTRING_ITER_NEXT && state != TEXTSTRING_ITER_END) {
ret = (str_iter2.get_inner_ret() != OB_SUCCESS) ?
str_iter2.get_inner_ret() : OB_INVALID_DATA;
LOG_WARN("iter state invalid", K(ret), K(state), K(str_iter2));
}
}
if (OB_SUCC(ret)) {
ObString lob_loc_str;
tmp_lob.get_result_buffer(lob_loc_str);
result.set_lob_value(ObLongTextType, lob_loc_str.ptr(), lob_loc_str.length());
if (tmp_lob.has_lob_header()) {
result.set_has_lob_header();
}
}
}
return ret;
}
// non-text tc
int ObExprConcat::calc(common::ObObj &result,
const common::ObString obj1,
const common::ObString obj2,
ObIAllocator *allocator,
bool is_oracle_mode,
const int64_t max_result_len)
{
int ret = OB_SUCCESS;
int32_t this_len = obj1.length();
int32_t other_len = obj2.length();
ObString varchar;
int64_t max_length = max_result_len;
if (max_result_len <= 0) {
max_length = is_oracle_mode ? OB_MAX_ORACLE_VARCHAR_LENGTH : OB_MAX_VARCHAR_LENGTH;
}
if (OB_UNLIKELY(this_len + other_len > max_length)) {
//FIXME: 合并后的字符串长度超过了最大限制，结果设置为NULL
result.set_null();
ret = OB_SIZE_OVERFLOW;
} else if (OB_UNLIKELY(this_len <= 0)) {
result.set_varchar(obj2);
} else if (OB_UNLIKELY(other_len <= 0)) {
result.set_varchar(obj1);
} else if (OB_ISNULL(allocator)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("null allocator", K(ret), K(allocator));
} else {
char *buf = NULL;
if (OB_ISNULL(buf = static_cast<char*>(allocator->alloc(this_len + other_len)))) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_ERROR("alloc memory failed", K(ret), K(this_len + other_len));
} else {
MEMCPY(buf, obj1.ptr(), this_len);
MEMCPY(buf + this_len, obj2.ptr(), other_len);
varchar.assign(buf, this_len + other_len);
result.set_varchar(varchar);
}
}
return ret;
}
int ObExprConcat::calc_result_typeN(ObExprResType &type,
ObExprResType *types,
int64_t param_num,
ObExprTypeCtx &type_ctx) const
{
int ret = OB_SUCCESS;
if (OB_UNLIKELY(param_num <= 0
|| (lib::is_oracle_mode() && param_num != 2))) {
ret = OB_INVALID_ARGUMENT_NUM;
LOG_WARN("invalid argument number", K(ret), K(param_num));
}
CK (OB_NOT_NULL(type_ctx.get_session()));
//类型 + 字符集推导
if (lib::is_oracle_mode()) {
ObSEArray<ObExprResType*, 2, ObNullAllocator> params;
for (int64_t i = 0; i < param_num; ++i) {
OZ (params.push_back(&types[i]));
}
OZ (aggregate_string_type_and_charset_oracle(*type_ctx.get_session(), params, type));
OZ (deduce_string_param_calc_type_and_charset(*type_ctx.get_session(), type, params));
} else {
bool has_text = false;
for (int64_t i = 0; !has_text && i < param_num; ++i) {
if (ObTinyTextType != types[i].get_type() && types[i].is_lob()) {
has_text = true;
}
}
if (has_text && GET_MIN_CLUSTER_VERSION() >= CLUSTER_VERSION_4_2_0_0) {
type.set_type(ObLongTextType);
} else {
type.set_varchar();
}
OZ (aggregate_charsets_for_string_result(type,
types,
param_num,
type_ctx.get_coll_type()));
for (int64_t i = 0; i < param_num; ++i) {
types[i].set_calc_type(type.get_type());
types[i].set_calc_collation_type(type.get_collation_type());
}
}
//结果的长度推导
if (OB_SUCC(ret)) {
if (lib::is_oracle_mode()) {
type.set_length(types[0].get_calc_length() + types[1].get_calc_length());
} else {
ObLength max_len = 0;
for (int64_t i = 0; i < param_num; ++i) {
if (ObRawType == types[i].get_type()) {
max_len += types[i].get_length() * 2;
} else {
max_len += types[i].get_length();
}
}
if (ObLongTextType == type.get_type()) {
max_len = OB_MAX_LONGTEXT_LENGTH / 4;
} else {
max_len = MIN(OB_MAX_VARCHAR_LENGTH, max_len);
if (max_len <= 0) {
max_len = OB_MAX_VARCHAR_LENGTH;
}
}
type.set_length(max_len);
}
}
/*
if (OB_SUCC(ret)) {
// 计算函数参数的目标类型
ObLength max_len = 0;
bool has_clob = false;
bool has_varchar = false;
bool has_nstring = false;
bool is_oracle_mode = lib::is_oracle_mode();
for (int64_t i = 0; i < param_num; ++i) {
if (is_oracle_mode && types[i].is_text()) {
has_clob = true;
} else if (is_oracle_mode && (types[i].is_fixed_len_char_type() || types[i].is_null())) {
// 对于都是 char 的 concat, 都用 varchar 计算, 最后再转换为 char.
types[i].set_calc_type(ObVarcharType);
} else {
has_varchar = true;
types[i].set_calc_type(ObVarcharType);
}
has_nstring |= ob_is_nstring_type(types[i].get_type());
if (ObRawType == types[i].get_type()) {
max_len += types[i].get_length() * 2;
} else {
max_len += types[i].get_length();
}
}
// 计算函数结果的类型
if (OB_UNLIKELY(has_clob)) {
if (has_nstring) {
ret = OB_NOT_SUPPORTED;
LOG_WARN("nclob not supported", K(ret));
}
type.set_type(ObLongTextType);
} else if (has_varchar) {
has_nstring ? type.set_nvarchar2() : type.set_varchar();
} else {
has_nstring ? type.set_nchar() : type.set_char();
}
if (OB_SUCC(ret) && is_oracle_mode) {
if (param_num != 2) {
ret = OB_INVALID_ARGUMENT_NUM;
LOG_WARN("invalid argument number, param should not less than 1", K(ret), K(param_num));
} else if (has_nstring) {
type.set_length_semantics(LS_CHAR);
} else {
// oracle 只会有两个参数
if (types[0].get_length_semantics() == types[1].get_length_semantics()) {
type.set_length_semantics(types[0].get_length_semantics());
} else {
const ObLengthSemantics default_length_semantics = (OB_NOT_NULL(type_ctx.get_session()) ? type_ctx.get_session()->get_actual_nls_length_semantics() : LS_BYTE);
type.set_length_semantics(default_length_semantics);
}
}
}
if (ObLongTextType == type.get_type()) {
max_len = OB_MAX_LONGTEXT_LENGTH / 4;
} else {
if (is_oracle_mode) {
max_len = MIN(OB_MAX_ORACLE_VARCHAR_LENGTH, max_len);
} else {
max_len = MIN(OB_MAX_VARCHAR_LENGTH, max_len);
}
}
type.set_length(max_len);
//TODO::@yanhua
if (OB_FAIL(ret)) {}
else if (OB_FAIL(aggregate_charsets_for_string_result(type,
types,
param_num,
type_ctx.get_coll_type()))) {
LOG_WARN("aggregate_charsets_for_string_result failed", K(ret));
} else {
for (int64_t i = 0; i < param_num; i++) {
types[i].set_calc_collation_type(type.get_collation_type());
if (lib::is_oracle_mode() && has_nstring && types[i].get_calc_type() == ObVarcharType) {
types[i].set_calc_type(ObNVarchar2Type);
}
}
}
}
*/
return ret;
}
int ObExprConcat::cg_expr(ObExprCGCtx &, const ObRawExpr &, ObExpr &expr) const
{
int ret = OB_SUCCESS;
CK(expr.arg_cnt_ > 0);
if (lib::is_oracle_mode()) {
CK(2 == expr.arg_cnt_);
}
if (OB_SUCC(ret)) {
expr.eval_func_ = &eval_concat;
}
return ret;
}
static int eval_concat_text(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum, const int64_t &res_len)
{
int ret = OB_SUCCESS;
ObTextStringDatumResult output_result(expr.datum_meta_.type_, &expr, &ctx, &expr_datum);
if (OB_FAIL(output_result.init(res_len))) {
LOG_WARN("init lob result failed");
} else {
int64_t off = 0;
ObString v_str;
ObEvalCtx::TempAllocGuard alloc_guard(ctx);
ObIAllocator &calc_alloc = alloc_guard.get_allocator();
for (int64_t i = 0; OB_SUCC(ret) && i < expr.arg_cnt_; i++) {
ObDatum &v = expr.locate_param_datum(ctx, i);
if (v.is_null()) {
} else {
ObDatumMeta input_meta = expr.args_[i]->datum_meta_;
bool has_lob_header = expr.args_[i]->obj_meta_.has_lob_header();
ObTextStringIter input_iter(input_meta.type_, input_meta.cs_type_, v.get_string(), has_lob_header);
ObTextStringIterState state;
ObString src_block_data;
if (OB_FAIL(input_iter.init(0, NULL, &calc_alloc))) {
LOG_WARN("init input_iter failed ", K(ret), K(input_iter));
}
while (OB_SUCC(ret)
&& (state = input_iter.get_next_block(src_block_data)) == TEXTSTRING_ITER_NEXT) {
if (OB_FAIL(output_result.append(src_block_data))) {
LOG_WARN("output_result append failed", K(ret), K(src_block_data));
} else {
off += src_block_data.length();
}
}
if (OB_FAIL(ret)) {
} else if (state != TEXTSTRING_ITER_NEXT && state != TEXTSTRING_ITER_END) {
ret = (input_iter.get_inner_ret() != OB_SUCCESS) ?
input_iter.get_inner_ret() : OB_INVALID_DATA;
LOG_WARN("iter state invalid", K(ret), K(state), K(input_iter));
}
}
}
if (OB_SUCC(ret)) {
output_result.set_result();
OB_ASSERT(off == res_len);
}
}
return ret;
}
int ObExprConcat::eval_concat(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
{
int ret = OB_SUCCESS;
if (OB_FAIL(expr.eval_param_value(ctx))) {
LOG_WARN("evaluate parameters values failed", K(ret));
} else {
ObDatum *first_not_null = NULL;
int64_t null_cnt = 0;
int64_t res_len = 0;
int64_t lob_data_byte_len = 0;
ObObjType res_type = expr.datum_meta_.type_;
// get result length
for (int64_t i = 0; OB_SUCC(ret) && i < expr.arg_cnt_; i++) {
ObDatum &v = expr.locate_param_datum(ctx, i);
if (v.is_null()) {
null_cnt += 1;
} else {
if (!ob_is_text_tc(expr.args_[i]->datum_meta_.type_)) {
res_len += v.len_;
} else {
ObLobLocatorV2 locator(v.get_string(), expr.args_[i]->obj_meta_.has_lob_header());
if (OB_FAIL(locator.get_lob_data_byte_len(lob_data_byte_len))) {
LOG_WARN("get lob data byte length failed", K(ret), K(locator));
} else {
res_len += lob_data_byte_len;
}
}
if (OB_SUCC(ret) && NULL == first_not_null) {
first_not_null = &v;
}
}
}
int64_t max_len = 0;
if (is_mysql_mode()) {
max_len = OB_MAX_VARCHAR_LENGTH;
} else if (expr.is_called_in_sql_) { // SQL in oracle mode
max_len = OB_MAX_ORACLE_VARCHAR_LENGTH;
} else { // PL in oracle mode
const int64_t concat_res_max_len_in_pl = 65535;
max_len = concat_res_max_len_in_pl;
}
if (ob_is_text_tc(res_type)) {
// FIXME bin.lb: mysql mode can not reach here, since result type is always varchar.
// Seem to be a bug:
max_len = OB_MAX_PACKET_LENGTH;
}
// mysql mode: all param calc types are varchar;
// oracle mode: if result type is longtext, param calc types must be longtext
if (OB_FAIL(ret)) {
} else if (res_len > max_len) {
expr_datum.set_null();
// BUGFIX: issue id 49051626
if (lib::is_oracle_mode()) ret = OB_ERR_TOO_LONG_STRING_IN_CONCAT;
else ret = OB_SIZE_OVERFLOW;
LOG_WARN("size overflow", K(ret), K(res_len), K(max_len));
} else if (expr.arg_cnt_ == null_cnt
|| (!lib::is_oracle_mode() && null_cnt > 0)) {
// input are all null or has null in mysql mode
expr_datum.set_null();
} else if ((expr.arg_cnt_ - null_cnt == 1) && !ob_is_text_tc(res_type)) {
// only one valid input, shadow copy
expr_datum.set_datum(*first_not_null);
} else if (!ob_is_text_tc(res_type)) {
char *buf = expr.get_str_res_mem(ctx, res_len);
if (OB_ISNULL(buf)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("allocate memory failed", K(ret), K(res_len));
} else {
int64_t off = 0;
for (int64_t i = 0; i < expr.arg_cnt_; i++) {
ObDatum &v = expr.locate_param_datum(ctx, i);
if (!v.is_null()) {
MEMCPY(buf + off, v.ptr_, v.len_);
off += v.len_;
}
}
OB_ASSERT(off == res_len);
}
expr_datum.set_string(buf, res_len);
} else { // text tc
ret = eval_concat_text(expr, ctx, expr_datum, res_len);
}
}
return ret;
}
}
}