109 lines
4.1 KiB
C++
109 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_bit_count.h"
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#include "sql/engine/ob_exec_context.h"
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#include "sql/ob_sql_utils.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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const uint8_t ObExprBitCount::char_to_num_bits[256] =
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{
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0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
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4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8,
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};
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ObExprBitCount::ObExprBitCount(ObIAllocator &alloc)
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: ObBitwiseExprOperator(alloc, T_FUN_SYS_BIT_COUNT, "bit_count", 1, NOT_ROW_DIMENSION)
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{
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}
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ObExprBitCount::~ObExprBitCount()
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{
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}
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int ObExprBitCount::calc_bitcount_expr(const ObExpr &expr, ObEvalCtx &ctx,
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ObDatum& res_datum)
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{
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int ret = OB_SUCCESS;
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uint64_t uint_val = 0;
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ObDatum *child_res = NULL;
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ObCastMode cast_mode = CM_NONE;
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void *get_uint_func = NULL;
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if (OB_UNLIKELY(1 != expr.arg_cnt_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("invalid arg cnt", K(ret), K(expr.arg_cnt_));
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} else if (OB_FAIL(expr.args_[0]->eval(ctx, child_res))) {
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LOG_WARN("eval arg failed", K(ret));
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} else if (child_res->is_null()) {
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res_datum.set_null();
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} else if (OB_FAIL(choose_get_int_func(expr.args_[0]->datum_meta_.type_, get_uint_func))) {
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LOG_WARN("choose_get_int_func failed", K(ret), K(expr.args_[0]->datum_meta_));
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} else if (OB_FAIL(ObSQLUtils::get_default_cast_mode(false, 0,
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ctx.exec_ctx_.get_my_session(), cast_mode))) {
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LOG_WARN("get_default_cast_mode failed", K(ret));
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} else if (OB_FAIL((reinterpret_cast<GetUIntFunc>(get_uint_func)(*child_res, true,
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uint_val, cast_mode)))) {
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LOG_WARN("get uint64 failed", K(ret), K(*child_res));
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} else {
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uint64_t temp_result = 0;
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temp_result = static_cast<uint64_t>(
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char_to_num_bits[static_cast<uint8_t>(uint_val)]
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+ char_to_num_bits[static_cast<uint8_t>(uint_val >> 8)]
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+ char_to_num_bits[static_cast<uint8_t>(uint_val >> 16)]
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+ char_to_num_bits[static_cast<uint8_t>(uint_val >> 24)]
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+ char_to_num_bits[static_cast<uint8_t>(uint_val >> 32)]
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+ char_to_num_bits[static_cast<uint8_t>(uint_val >> 40)]
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+ char_to_num_bits[static_cast<uint8_t>(uint_val >> 48)]
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+ char_to_num_bits[static_cast<uint8_t>(uint_val >> 56)]);
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res_datum.set_uint(temp_result);
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}
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return ret;
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}
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int ObExprBitCount::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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const BitOperator op = BIT_COUNT;
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if (OB_FAIL(cg_bitwise_expr(expr_cg_ctx, raw_expr, rt_expr, op))) {
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LOG_WARN("cg_bitwise_expr for bit count failed", K(ret), K(rt_expr));
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} else {
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rt_expr.eval_func_ = ObExprBitCount::calc_bitcount_expr;
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}
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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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