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src/sql/engine/expr/ob_expr_concat.cpp Normal file
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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 "sql/parser/ob_item_type.h"
//#include "sql/engine/expr/ob_expr_promotion_util.h"
#include "sql/session/ob_sql_session_info.h"
namespace oceanbase {
using namespace common;
namespace sql {
ObExprConcat::ObExprConcat(ObIAllocator& alloc) : ObStringExprOperator(alloc, T_OP_CNN, N_CONCAT, MORE_THAN_ZERO)
{
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)
{
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(result, str1.ptr(), str1.length(), str2.ptr(), str2.length(), allocator));
} else {
OZ(calc(result, str1, str2, allocator, is_oracle_mode));
}
}
} 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(result,
obj1.get_string_ptr(),
obj1.get_string_len(),
obj2.get_string_ptr(),
obj2.get_string_len(),
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);
}
if (OB_FAIL(ret)) {
LOG_WARN("concat error", K(ret), K(is_oracle_mode), K(obj1), K(obj2));
}
}
return ret;
}
int ObExprConcat::calc_resultN(
common::ObObj& result, const common::ObObj* objs_array, int64_t param_num, common::ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
if (OB_ISNULL(expr_ctx.calc_buf_) || OB_UNLIKELY(param_num <= 0) || OB_ISNULL(objs_array) ||
(param_num == 1 && share::is_oracle_mode())) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("Invalid argument", K(ret), K(param_num), K(expr_ctx.calc_buf_), K(objs_array));
} else if (param_num == 1) {
ObString null_string;
ObObj null_obj;
null_obj.set_varchar(null_string);
if (OB_FAIL(calc(
result, null_obj, objs_array[0], expr_ctx.calc_buf_, result_type_.get_type(), lib::is_oracle_mode()))) {
LOG_WARN("fail to calc function concat", K(ret), K(objs_array[0]), K(lib::is_oracle_mode()));
}
} else {
bool is_oracle_mode = share::is_oracle_mode();
if (is_oracle_mode && param_num > 2) {
ret = OB_INVALID_ARGUMENT_NUM;
LOG_WARN("CONCAT expect 2 arguments", "actual argument count", param_num, K(ret));
} else if (OB_FAIL(calc(result,
objs_array[0],
objs_array[1],
expr_ctx.calc_buf_,
result_type_.get_type(),
is_oracle_mode))) {
LOG_WARN("fail to calc function concat", K(ret), K(objs_array[0]), K(objs_array[1]), K(is_oracle_mode));
} else if (!result.is_null()) {
for (int64_t i = 2; OB_SUCC(ret) && i < param_num; ++i) {
if (OB_FAIL(calc(result, result, objs_array[i], expr_ctx.calc_buf_, result_type_.get_type(), is_oracle_mode))) {
LOG_WARN("fail to calc function concat", K(ret), K(result), K(objs_array[i]), K(is_oracle_mode));
} else if (result.is_null()) {
break;
}
}
} else {
// result is null. do nothing.
}
}
if (OB_SUCC(ret) && !result.is_null()) {
result.set_meta_type(result_type_);
}
return ret;
}
int ObExprConcat::calc(common::ObObj& result, const char* obj1_ptr, const int32_t this_len, const char* obj2_ptr,
const int32_t other_len, ObIAllocator* allocator)
{
int ret = OB_SUCCESS;
ObString varchar;
int32_t max_length = OB_MAX_PACKET_LENGTH;
if (OB_UNLIKELY(this_len + other_len > max_length)) {
result.set_null();
ret = OB_SIZE_OVERFLOW;
LOG_WARN("length overflow", K(ret), K(this_len), K(other_len), K(max_length));
} else if (OB_UNLIKELY(this_len <= 0)) {
result.set_lob_value(ObLongTextType, obj2_ptr, other_len);
} else if (OB_UNLIKELY(other_len <= 0)) {
result.set_lob_value(ObLongTextType, obj1_ptr, this_len);
} 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);
result.set_lob_value(ObLongTextType, buf, this_len + other_len);
}
}
return ret;
}
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 /* =0 */)
{
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)) {
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 || (share::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()));
if (share::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 {
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(ObVarcharType);
types[i].set_calc_collation_type(type.get_collation_type());
}
}
if (OB_SUCC(ret)) {
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 {
if (share::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);
}
/*
if (OB_SUCC(ret)) {
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())) {
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();
}
}
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 {
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::
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 (share::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;
}
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;
for (int64_t i = 0; i < expr.arg_cnt_; i++) {
ObDatum& v = expr.locate_param_datum(ctx, i);
if (v.is_null()) {
null_cnt += 1;
} else {
res_len += v.len_;
if (NULL == first_not_null) {
first_not_null = &v;
}
}
}
int64_t max_len = lib::is_oracle_mode() ? OB_MAX_ORACLE_VARCHAR_LENGTH : OB_MAX_VARCHAR_LENGTH;
if (ob_is_text_tc(expr.datum_meta_.type_)) {
// FIXME : mysql mode can not reach here, since result type is always varchar.
max_len = OB_MAX_PACKET_LENGTH;
}
if (res_len > max_len) {
expr_datum.set_null();
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) {
// only one valid input, shadow copy
expr_datum.set_datum(*first_not_null);
} else {
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);
}
}
return ret;
}
} // namespace sql
} // namespace oceanbase