127 lines
4.1 KiB
C++
127 lines
4.1 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_make_set.h"
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#include "sql/engine/expr/ob_expr_concat_ws.h"
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using namespace oceanbase::common;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprMakeSet::ObExprMakeSet(ObIAllocator &alloc)
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: ObStringExprOperator(alloc, T_FUN_SYS_MAKE_SET, "make_set", MORE_THAN_ONE, VALID_FOR_GENERATED_COL)
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{
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need_charset_convert_ = false;
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}
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ObExprMakeSet::~ObExprMakeSet()
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{
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}
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int ObExprMakeSet::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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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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if(OB_UNLIKELY(param_num <= 1)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument number, param should not less than 2", K(ret), K(param_num));
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} else {
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// set expected type of parameter
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ObLength max_len = 0;
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types[0].set_calc_type(ObIntType);
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for (int64_t i = 1; i < param_num; ++i) {
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types[i].set_calc_type(ObVarcharType);
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max_len += types[i].get_length();
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}
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// set expected type of results
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type.set_varchar();
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type.set_length(max_len);
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if OB_FAIL(aggregate_charsets_for_string_result(type, &types[1], param_num - 1, type_ctx.get_coll_type())) {
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LOG_WARN("aggregate charset for string result failed", K(ret));
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} else {
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for (int64_t i = 1; i < param_num; i++) {
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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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}
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return ret;
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}
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int ObExprMakeSet::calc_make_set_expr(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum &res)
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{
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int ret = OB_SUCCESS;
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ObDatum *input_bits_dat = NULL;
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if (OB_UNLIKELY(expr.arg_cnt_ < 2)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid argument", K(ret), K(expr.arg_cnt_));
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} else if (OB_FAIL(expr.eval_param_value(ctx, input_bits_dat))) {
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LOG_WARN("eval param failed", K(ret));
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} else if (input_bits_dat->is_null()) {
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res.set_null();
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} else {
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// compute input bits representation
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uint64_t input_bits = static_cast<uint64_t>(input_bits_dat->get_int());
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if (expr.arg_cnt_ <= 64) {
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input_bits &= ((ulonglong) 1 << (expr.arg_cnt_ - 1)) - 1;
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}
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ObSEArray<ObString, 32> words;
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for (int64_t pos = 1, temp_input_bits = input_bits; OB_SUCC(ret) && temp_input_bits > 0;
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temp_input_bits >>= 1, ++pos) {
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const ObDatum &dat = expr.locate_param_datum(ctx, pos);
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if (((temp_input_bits & 1) > 0) && (!dat.is_null())) {
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if (OB_FAIL(words.push_back(dat.get_string()))) {
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LOG_WARN("push back word failed", K(ret));
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}
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}
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}
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if (OB_SUCC(ret)) {
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ObString res_str;
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if (0 == words.count()) {
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res.set_string(res_str);
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} else {
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const ObString sep_str = ObCharsetUtils::get_const_str(expr.datum_meta_.cs_type_, ',');
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ObExprStrResAlloc res_alloc(expr, ctx);
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if (sep_str.empty()) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get empty separator string", K(ret), K(expr.datum_meta_));
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} else if (OB_FAIL(ObExprConcatWs::calc(sep_str, words, res_alloc, res_str))) {
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LOG_WARN("calc concat ws failed", K(ret), K(sep_str));
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} else {
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res.set_string(res_str);
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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 ObExprMakeSet::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
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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_make_set_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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