94 lines
2.9 KiB
C++
94 lines
2.9 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_space.h"
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#include "lib/utility/ob_macro_utils.h"
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#include "sql/engine/expr/ob_expr_repeat.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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namespace oceanbase
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{
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namespace sql
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{
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using namespace common;
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ObExprSpace::ObExprSpace(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_SPACE, N_SPACE, 1, NOT_ROW_DIMENSION) {}
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inline int ObExprSpace::calc_result_type1(
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ObExprResType &type,
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ObExprResType &type1,
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ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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// space is mysql only expr
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CK(lib::is_mysql_mode());
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type.set_type(ObVarcharType);
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type.set_collation_level(type1.get_collation_level());
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type.set_collation_type(get_default_collation_type(type.get_type(), *type_ctx.get_session()));
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type.set_length(OB_MAX_VARCHAR_LENGTH);
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type1.set_calc_type(ObIntType);
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// Set cast mode for parameter casting, 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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return ret;
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}
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int ObExprSpace::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(1 == rt_expr.arg_cnt_);
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rt_expr.eval_func_ = eval_space;
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return ret;
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}
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int ObExprSpace::eval_space(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 *count = NULL;
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int64_t max_size = 0;
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bool is_null = false;
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ObString output;
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ObString space(1, " ");
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ObExprStrResAlloc expr_res_alloc(expr, ctx);
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if (OB_FAIL(expr.args_[0]->eval(ctx, count))) {
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LOG_WARN("evaluate parameters failed", K(ret));
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} else if (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 if (count->get_int() > max_size) {
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LOG_WARN("Result of space was larger than max_allow_packet_size",
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K(count->get_int()), K(max_size));
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LOG_USER_WARN(OB_ERR_FUNC_RESULT_TOO_LARGE, "space", static_cast<int>(max_size));
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expr_datum.set_null();
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} else if (OB_FAIL(ObExprRepeat::repeat(output, is_null,
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space, 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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return ret;
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}
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} // sql
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} // oceanbase
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