101 lines
3.0 KiB
C++
101 lines
3.0 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 "ob_expr_convert.h"
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#include "lib/charset/ob_charset.h"
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#include "sql/engine/expr/ob_expr_cast.h"
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#include "sql/session/ob_sql_session_info.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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namespace sql {
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ObExprConvert::ObExprConvert(ObIAllocator& alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_CONVERT, N_CONVERT, 2, NOT_ROW_DIMENSION)
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{}
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ObExprConvert::~ObExprConvert()
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{}
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int ObExprConvert::calc_result_type2(
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ObExprResType& type, ObExprResType& type1, ObExprResType& type2, ObExprTypeCtx& type_ctx) const
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{
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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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type.set_type(type1.get_type());
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type.set_scale(type1.get_scale());
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type.set_precision(type1.get_precision());
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if (ob_is_string_type(type.get_type())) {
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type.set_length(type1.get_length());
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}
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const ObObj& dest_collation = type2.get_param();
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TYPE_CHECK(dest_collation, ObVarcharType);
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if (OB_SUCC(ret)) {
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ObString cs_name = dest_collation.get_string();
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ObCharsetType charset_type = CHARSET_INVALID;
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if (CHARSET_INVALID == (charset_type = ObCharset::charset_type(cs_name.trim()))) {
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ret = OB_ERR_UNKNOWN_CHARSET;
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LOG_WARN("unknown charset", K(ret), K(cs_name));
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} else {
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type.set_collation_level(CS_LEVEL_EXPLICIT);
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type.set_collation_type(ObCharset::get_default_collation(charset_type));
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// set calc type
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// only set type2 here.
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type2.set_calc_type(ObVarcharType);
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type1.set_calc_meta(type.get_obj_meta());
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type1.set_calc_collation_type(type.get_collation_type());
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type1.set_calc_collation_level(type.get_collation_level());
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LOG_DEBUG("in calc result type", K(ret), K(type1), K(type2), K(type));
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}
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}
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return ret;
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}
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int ObExprConvert::calc_result2(ObObj& result, const ObObj& obj1, const ObObj& obj2, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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UNUSED(obj2);
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UNUSED(expr_ctx);
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result = obj1;
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return ret;
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}
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int calc_convert_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum* child_res = NULL;
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if (OB_FAIL(expr.args_[0]->eval(ctx, child_res))) {
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LOG_WARN("eval arg 0 failed", K(ret));
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} else {
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res_datum.set_datum(*child_res);
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}
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return ret;
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}
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int ObExprConvert::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(expr_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = calc_convert_expr;
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return ret;
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}
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} // namespace sql
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} // namespace oceanbase
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