244 lines
7.9 KiB
C++
244 lines
7.9 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_repeat.h"
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#include <limits.h>
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#include <string.h>
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#include "sql/session/ob_sql_session_info.h"
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#include "sql/engine/ob_exec_context.h"
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using namespace oceanbase::common;
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using namespace oceanbase::sql;
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namespace oceanbase
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{
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namespace sql
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{
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}
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}
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ObExprRepeat::ObExprRepeat(ObIAllocator &alloc)
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: ObStringExprOperator(alloc, T_FUN_SYS_REPEAT, N_REPEAT, 2)
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{
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}
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ObExprRepeat::~ObExprRepeat()
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{
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}
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int ObExprRepeat::calc_result_type2(ObExprResType &type,
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ObExprResType &text,
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ObExprResType &count,
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ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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text.set_calc_type(common::ObVarcharType);
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count.set_calc_type(common::ObIntType);
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// Set cast mode for %count parameter, truncate string to integer.
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type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_STRING_INTEGER_TRUNC);
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// repeat is mysql only epxr.
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CK(lib::is_mysql_mode());
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if (OB_SUCC(ret)) {
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ObObjType res_type = ObMaxType;
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if (text.is_null() || count.is_null()) {
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res_type = ObVarcharType;
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} else if (count.is_literal()) {
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const ObObj &obj = count.get_param();
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ObArenaAllocator alloc(ObModIds::OB_SQL_RES_TYPE);
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const ObDataTypeCastParams dtc_params =
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ObBasicSessionInfo::create_dtc_params(type_ctx.get_session());
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int64_t cur_time = 0;
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ObCastMode cast_mode = CM_NONE;
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if (OB_FAIL(ObSQLUtils::get_default_cast_mode(type_ctx.get_session(), cast_mode))) {
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LOG_WARN("failed to get default cast mode", K(ret));
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} else {
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cast_mode |= CM_WARN_ON_FAIL;
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ObCastCtx cast_ctx(
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&alloc, &dtc_params, cur_time, cast_mode, CS_TYPE_INVALID);
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int64_t count_val = 0;
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EXPR_GET_INT64_V2(obj, count_val);
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res_type = get_result_type_mysql(text.get_length() * count_val);
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}
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} else {
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res_type = ObLongTextType;
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}
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type.set_type(res_type);
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type.set_collation_level(text.get_collation_level());
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type.set_collation_type(text.get_collation_type());
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if (ObVarcharType == type.get_type()) {
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/*
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* In terms of repeat(A, B), we can know the actual length when B is literal
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* constant indeed.
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* But we do not want to do this since if we did, the plan cache will not be
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* hit. So, no matter B comes from literal constant or column we just set
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* length to be OB_MAX_VARCHAR_LENGTH here.
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*/
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type.set_length(MAX_CHAR_LENGTH_FOR_VARCAHR_RESULT);
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} else if (ob_is_text_tc(type.get_type())) {
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const int32_t mbmaxlen = 4;
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const int32_t default_text_length =
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ObAccuracy::DDL_DEFAULT_ACCURACY[type.get_type()].get_length() / mbmaxlen;
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// need to set a correct length for text tc in mysql mode
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type.set_length(default_text_length);
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}
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}
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if (OB_SUCC(ret)) {
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if (OB_FAIL(aggregate_charsets_for_string_result(type, &text, 1, type_ctx.get_coll_type()))) {
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LOG_WARN("failed to aggregate charsets for string result", K(ret));
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} else {
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text.set_calc_collation_level(type.get_collation_level());
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text.set_calc_collation_type(type.get_collation_type());
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}
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}
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return ret;
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}
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int ObExprRepeat::calc(
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ObObj &result,
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const ObObj &text,
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const ObObj &count,
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ObIAllocator *allocator,
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ObObjType res_type,
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const int64_t max_result_size)
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{
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int ret = OB_SUCCESS;
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if (text.is_null() || count.is_null()) {
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result.set_null();
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} else {
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TYPE_CHECK(text, ObVarcharType);
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TYPE_CHECK(count, ObIntType);
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ObString local_text = text.get_string();
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int64_t local_count = count.get_int();
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if (OB_FAIL(calc(result, res_type, local_text, local_count, allocator, max_result_size))) {
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LOG_WARN("Failed to cacl result");
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}
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}
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return ret;
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}
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int ObExprRepeat::repeat(ObString &output,
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bool &is_null,
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const ObString &text,
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const int64_t count,
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common::ObIAllocator &allocator,
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const int64_t max_result_size)
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{
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is_null = false;
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int ret = OB_SUCCESS;
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if (count <= 0 || text.length() <= 0 || max_result_size <= 0) {
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output.assign_ptr(NULL, 0);
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} else {
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int64_t length = static_cast<int64_t>(text.length());
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// Safe length check
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if ((length > max_result_size / count) || (length > INT_MAX / count)) {
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LOG_WARN("Result of repeat was larger than max_allow_packet_size",
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K(ret), K(length), K(count), K(max_result_size));
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LOG_USER_WARN(OB_ERR_FUNC_RESULT_TOO_LARGE, "repeat", static_cast<int>(max_result_size));
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is_null = true;
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} else {
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//avoid realloc
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if (1 == count) {
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output = text;
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} else {
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int64_t tot_length = length * count;
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char *buf = static_cast<char *>(allocator.alloc(tot_length));
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if (OB_ISNULL(buf)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_ERROR("alloc memory failed", K(ret), K(tot_length));
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} else {
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int64_t tmp_count = count;
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char *tmp_buf = buf;
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while (tmp_count--) {
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MEMCPY(tmp_buf, text.ptr(), length);
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tmp_buf += length;
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}
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output.assign_ptr(buf, static_cast<int32_t>(tot_length));
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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 ObExprRepeat::calc(ObObj &result,
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const ObObjType res_type,
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const ObString &text,
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const int64_t count,
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ObIAllocator *allocator,
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const int64_t max_result_size)
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{
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int ret = OB_SUCCESS;
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ObString output;
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bool is_null = false;
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if (OB_ISNULL(allocator)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("null allocator", K(ret), K(allocator));
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} else if (false == ob_is_string_type(res_type)) {
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ret = OB_INVALID_ARGUMENT;
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// ObExprRepeat::calc_result_type2()方法中，规定返回结果的类型一定是属于某个string type
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LOG_WARN("make sure res_type is string type", K(ret), K(res_type));
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} else if (OB_FAIL(repeat(output, is_null, text, count, *allocator, max_result_size))) {
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LOG_WARN("do repeat failed", K(ret));
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} else {
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if (is_null) {
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result.set_null();
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} else {
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result.set_string(res_type, output);
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}
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}
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return ret;
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}
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int ObExprRepeat::cg_expr(ObExprCGCtx &, const ObRawExpr &, ObExpr &rt_expr) const
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{
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int ret = OB_SUCCESS;
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CK(2 == rt_expr.arg_cnt_);
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rt_expr.eval_func_ = eval_repeat;
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return ret;
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}
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int ObExprRepeat::eval_repeat(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum *text = NULL;
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ObDatum *count = NULL;
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int64_t max_size = 0;
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if (OB_FAIL(expr.args_[0]->eval(ctx, text))
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|| OB_FAIL(expr.args_[1]->eval(ctx, count))) {
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LOG_WARN("evaluate parameters failed", K(ret));
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} else if (text->is_null() || count->is_null()) {
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expr_datum.set_null();
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} else if (OB_FAIL(ctx.exec_ctx_.get_my_session()->get_max_allowed_packet(max_size))) {
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LOG_WARN("get max length failed", K(ret));
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} else {
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ObExprStrResAlloc expr_res_alloc(expr, ctx);
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bool is_null = false;
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ObString output;
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if (OB_FAIL(repeat(output, is_null,
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text->get_string(), count->get_int(), expr_res_alloc, max_size))) {
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LOG_WARN("do repeat failed", K(ret));
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} else {
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if (is_null) {
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expr_datum.set_null();
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} else {
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expr_datum.set_string(output);
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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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