389 lines
13 KiB
C++
389 lines
13 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#define USING_LOG_PREFIX SQL_ENG
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#include "sql/engine/expr/ob_expr_concat.h"
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#include <string.h>
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#include "lib/oblog/ob_log.h"
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//#include "share/object/ob_obj_cast.h"
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#include "objit/common/ob_item_type.h"
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//#include "sql/engine/expr/ob_expr_promotion_util.h"
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#include "sql/session/ob_sql_session_info.h"
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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ObExprConcat::ObExprConcat(ObIAllocator &alloc)
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: ObStringExprOperator(alloc, T_OP_CNN, N_CONCAT, MORE_THAN_ZERO)
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{
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need_charset_convert_ = false;
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}
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ObExprConcat::~ObExprConcat()
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{
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}
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int ObExprConcat::calc(ObObj &result, const ObObj &obj1, const ObObj &obj2,
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ObIAllocator *allocator, const ObObjType result_type, bool is_oracle_mode,
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const int64_t max_result_len)
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{
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int ret = OB_SUCCESS;
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if (is_oracle_mode) {
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if (obj1.is_null() && obj2.is_null()) {
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result.set_null();
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} else {
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ObString str1;
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ObString str2;
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if (!obj1.is_null()) {
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str1 = obj1.get_string();
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}
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if (!obj2.is_null()) {
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str2 = obj2.get_string();
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}
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if (ob_is_text_tc(result_type)) {
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OZ (calc(result, str1.ptr(), str1.length(), str2.ptr(), str2.length(), allocator));
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} else {
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OZ (calc(result, str1, str2, allocator, is_oracle_mode, max_result_len));
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}
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}
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} else {
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if (OB_UNLIKELY(obj1.is_null()) ||
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OB_UNLIKELY(obj2.is_null())) {
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result.set_null();
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} else if (OB_UNLIKELY(obj1.is_text() || obj2.is_text())) {
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ret = calc(result, obj1.get_string_ptr(), obj1.get_string_len(), obj2.get_string_ptr(),
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obj2.get_string_len(), allocator);
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} else {
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TYPE_CHECK(obj1, ObVarcharType);
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TYPE_CHECK(obj2, ObVarcharType);
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ObString str1 = obj1.get_string();
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ObString str2 = obj2.get_string();
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ret = calc(result, str1, str2, allocator, false, 0);
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}
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if (OB_FAIL(ret)) {
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LOG_WARN("concat error", K(ret), K(is_oracle_mode), K(obj1), K(obj2));
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}
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}
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return ret;
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}
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int ObExprConcat::calc(common::ObObj &result,
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const char *obj1_ptr,
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const int32_t this_len,
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const char *obj2_ptr,
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const int32_t other_len,
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ObIAllocator *allocator)
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{
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int ret = OB_SUCCESS;
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ObString varchar;
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int32_t max_length = OB_MAX_PACKET_LENGTH;
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if (OB_UNLIKELY(this_len + other_len > max_length)) {
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//FIXME: 合并后的字符串长度超过了最大限制，结果设置为NULL
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result.set_null();
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ret = OB_SIZE_OVERFLOW;
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LOG_WARN("length overflow", K(ret), K(this_len), K(other_len), K(max_length));
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} else if (OB_UNLIKELY(this_len <= 0)) {
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result.set_lob_value(ObLongTextType, obj2_ptr, other_len);
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} else if (OB_UNLIKELY(other_len <= 0)) {
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result.set_lob_value(ObLongTextType, obj1_ptr, this_len);
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} else if (OB_ISNULL(allocator)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("null allocator", K(ret), K(allocator));
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} else {
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char *buf = NULL;
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if (OB_ISNULL(buf = static_cast<char*>(allocator->alloc(this_len + other_len)))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_ERROR("alloc memory failed", K(ret), K(this_len + other_len));
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} else {
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MEMCPY(buf, obj1_ptr, this_len);
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MEMCPY(buf + this_len, obj2_ptr, other_len);
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result.set_lob_value(ObLongTextType, buf, this_len + other_len);
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}
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}
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return ret;
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}
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int ObExprConcat::calc(common::ObObj &result,
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const common::ObString obj1,
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const common::ObString obj2,
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ObIAllocator *allocator,
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bool is_oracle_mode,
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const int64_t max_result_len)
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{
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int ret = OB_SUCCESS;
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int32_t this_len = obj1.length();
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int32_t other_len = obj2.length();
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ObString varchar;
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int64_t max_length = max_result_len;
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if (max_result_len <= 0) {
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max_length = is_oracle_mode ? OB_MAX_ORACLE_VARCHAR_LENGTH : OB_MAX_VARCHAR_LENGTH;
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}
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if (OB_UNLIKELY(this_len + other_len > max_length)) {
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//FIXME: 合并后的字符串长度超过了最大限制，结果设置为NULL
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result.set_null();
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ret = OB_SIZE_OVERFLOW;
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} else if (OB_UNLIKELY(this_len <= 0)) {
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result.set_varchar(obj2);
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} else if (OB_UNLIKELY(other_len <= 0)) {
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result.set_varchar(obj1);
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} else if (OB_ISNULL(allocator)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("null allocator", K(ret), K(allocator));
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} else {
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char *buf = NULL;
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if (OB_ISNULL(buf = static_cast<char*>(allocator->alloc(this_len + other_len)))) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_ERROR("alloc memory failed", K(ret), K(this_len + other_len));
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} else {
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MEMCPY(buf, obj1.ptr(), this_len);
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MEMCPY(buf + this_len, obj2.ptr(), other_len);
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varchar.assign(buf, this_len + other_len);
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result.set_varchar(varchar);
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}
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}
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return ret;
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}
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int ObExprConcat::calc_result_typeN(ObExprResType &type,
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ObExprResType *types,
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int64_t param_num,
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ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_UNLIKELY(param_num <= 0
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|| (lib::is_oracle_mode() && param_num != 2))) {
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ret = OB_INVALID_ARGUMENT_NUM;
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LOG_WARN("invalid argument number", K(ret), K(param_num));
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}
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CK (OB_NOT_NULL(type_ctx.get_session()));
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//类型 + 字符集推导
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if (lib::is_oracle_mode()) {
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ObSEArray<ObExprResType*, 2, ObNullAllocator> params;
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for (int64_t i = 0; i < param_num; ++i) {
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OZ (params.push_back(&types[i]));
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}
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OZ (aggregate_string_type_and_charset_oracle(*type_ctx.get_session(), params, type));
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OZ (deduce_string_param_calc_type_and_charset(*type_ctx.get_session(), type, params));
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} else {
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type.set_varchar();
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OZ (aggregate_charsets_for_string_result(type,
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types,
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param_num,
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type_ctx.get_coll_type()));
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for (int64_t i = 0; i < param_num; ++i) {
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types[i].set_calc_type(ObVarcharType);
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types[i].set_calc_collation_type(type.get_collation_type());
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}
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}
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//结果的长度推导
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if (OB_SUCC(ret)) {
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if (lib::is_oracle_mode()) {
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type.set_length(types[0].get_calc_length() + types[1].get_calc_length());
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} else {
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ObLength max_len = 0;
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for (int64_t i = 0; i < param_num; ++i) {
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if (ObRawType == types[i].get_type()) {
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max_len += types[i].get_length() * 2;
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} else {
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max_len += types[i].get_length();
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}
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}
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if (ObLongTextType == type.get_type()) {
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max_len = OB_MAX_LONGTEXT_LENGTH / 4;
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} else {
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max_len = MIN(OB_MAX_VARCHAR_LENGTH, max_len);
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if (max_len <= 0) {
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max_len = OB_MAX_VARCHAR_LENGTH;
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}
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}
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type.set_length(max_len);
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}
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}
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/*
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if (OB_SUCC(ret)) {
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// 计算函数参数的目标类型
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ObLength max_len = 0;
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bool has_clob = false;
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bool has_varchar = false;
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bool has_nstring = false;
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bool is_oracle_mode = lib::is_oracle_mode();
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for (int64_t i = 0; i < param_num; ++i) {
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if (is_oracle_mode && types[i].is_text()) {
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has_clob = true;
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} else if (is_oracle_mode && (types[i].is_fixed_len_char_type() || types[i].is_null())) {
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// 对于都是 char 的 concat, 都用 varchar 计算, 最后再转换为 char.
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types[i].set_calc_type(ObVarcharType);
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} else {
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has_varchar = true;
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types[i].set_calc_type(ObVarcharType);
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}
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has_nstring |= ob_is_nstring_type(types[i].get_type());
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if (ObRawType == types[i].get_type()) {
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max_len += types[i].get_length() * 2;
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} else {
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max_len += types[i].get_length();
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}
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}
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// 计算函数结果的类型
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if (OB_UNLIKELY(has_clob)) {
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if (has_nstring) {
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ret = OB_NOT_SUPPORTED;
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LOG_WARN("nclob not supported", K(ret));
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}
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type.set_type(ObLongTextType);
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} else if (has_varchar) {
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has_nstring ? type.set_nvarchar2() : type.set_varchar();
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} else {
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has_nstring ? type.set_nchar() : type.set_char();
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}
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if (OB_SUCC(ret) && is_oracle_mode) {
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if (param_num != 2) {
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ret = OB_INVALID_ARGUMENT_NUM;
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LOG_WARN("invalid argument number, param should not less than 1", K(ret), K(param_num));
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} else if (has_nstring) {
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type.set_length_semantics(LS_CHAR);
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} else {
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// oracle 只会有两个参数
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if (types[0].get_length_semantics() == types[1].get_length_semantics()) {
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type.set_length_semantics(types[0].get_length_semantics());
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} else {
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const ObLengthSemantics default_length_semantics = (OB_NOT_NULL(type_ctx.get_session()) ? type_ctx.get_session()->get_actual_nls_length_semantics() : LS_BYTE);
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type.set_length_semantics(default_length_semantics);
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}
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}
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}
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if (ObLongTextType == type.get_type()) {
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max_len = OB_MAX_LONGTEXT_LENGTH / 4;
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} else {
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if (is_oracle_mode) {
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max_len = MIN(OB_MAX_ORACLE_VARCHAR_LENGTH, max_len);
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} else {
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max_len = MIN(OB_MAX_VARCHAR_LENGTH, max_len);
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}
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}
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type.set_length(max_len);
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//TODO::@yanhua
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if (OB_FAIL(ret)) {}
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else if (OB_FAIL(aggregate_charsets_for_string_result(type,
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types,
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param_num,
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type_ctx.get_coll_type()))) {
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LOG_WARN("aggregate_charsets_for_string_result failed", K(ret));
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} else {
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for (int64_t i = 0; i < param_num; i++) {
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types[i].set_calc_collation_type(type.get_collation_type());
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if (lib::is_oracle_mode() && has_nstring && types[i].get_calc_type() == ObVarcharType) {
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types[i].set_calc_type(ObNVarchar2Type);
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}
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}
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}
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}
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*/
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return ret;
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}
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int ObExprConcat::cg_expr(ObExprCGCtx &, const ObRawExpr &, ObExpr &expr) const
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{
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int ret = OB_SUCCESS;
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CK(expr.arg_cnt_ > 0);
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if (lib::is_oracle_mode()) {
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CK(2 == expr.arg_cnt_);
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}
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if (OB_SUCC(ret)) {
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expr.eval_func_ = &eval_concat;
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}
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return ret;
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}
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int ObExprConcat::eval_concat(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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if (OB_FAIL(expr.eval_param_value(ctx))) {
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LOG_WARN("evaluate parameters values failed", K(ret));
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} else {
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ObDatum *first_not_null = NULL;
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int64_t null_cnt = 0;
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int64_t res_len = 0;
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for (int64_t i = 0; i < expr.arg_cnt_; i++) {
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ObDatum &v = expr.locate_param_datum(ctx, i);
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if (v.is_null()) {
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null_cnt += 1;
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} else {
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res_len += v.len_;
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if (NULL == first_not_null) {
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first_not_null = &v;
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}
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}
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}
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int64_t max_len = 0;
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if (is_mysql_mode()) {
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max_len = OB_MAX_VARCHAR_LENGTH;
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} else if (expr.is_called_in_sql_) { // SQL in oracle mode
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max_len = OB_MAX_ORACLE_VARCHAR_LENGTH;
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} else { // PL in oracle mode
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const int64_t concat_res_max_len_in_pl = 65535;
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max_len = concat_res_max_len_in_pl;
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}
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if (ob_is_text_tc(expr.datum_meta_.type_)) {
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// FIXME bin.lb: mysql mode can not reach here, since result type is always varchar.
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// Seem to be a bug: https://work.aone.alibaba-inc.com/issue/24653475
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max_len = OB_MAX_PACKET_LENGTH;
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}
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if (res_len > max_len) {
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expr_datum.set_null();
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ret = OB_SIZE_OVERFLOW;
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LOG_WARN("size overflow", K(ret), K(res_len), K(max_len));
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} else if (expr.arg_cnt_ == null_cnt
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|| (!lib::is_oracle_mode() && null_cnt > 0)) {
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// input are all null or has null in mysql mode
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expr_datum.set_null();
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} else if (expr.arg_cnt_ - null_cnt == 1) {
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// only one valid input, shadow copy
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expr_datum.set_datum(*first_not_null);
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} else {
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char *buf = expr.get_str_res_mem(ctx, res_len);
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if (OB_ISNULL(buf)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("allocate memory failed", K(ret), K(res_len));
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} else {
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int64_t off = 0;
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for (int64_t i = 0; i < expr.arg_cnt_; i++) {
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ObDatum &v = expr.locate_param_datum(ctx, i);
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if (!v.is_null()) {
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MEMCPY(buf + off, v.ptr_, v.len_);
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off += v.len_;
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}
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}
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OB_ASSERT(off == res_len);
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}
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expr_datum.set_string(buf, res_len);
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}
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}
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return ret;
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}
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}
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}
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