125 lines
3.9 KiB
C++
125 lines
3.9 KiB
C++
/**
|
|
* Copyright (c) 2021 OceanBase
|
|
* OceanBase CE is licensed under Mulan PubL v2.
|
|
* You can use this software according to the terms and conditions of the Mulan PubL v2.
|
|
* You may obtain a copy of Mulan PubL v2 at:
|
|
* http://license.coscl.org.cn/MulanPubL-2.0
|
|
* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
|
|
* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
|
|
* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
|
|
* See the Mulan PubL v2 for more details.
|
|
*/
|
|
|
|
#define USING_LOG_PREFIX SQL_ENG
|
|
|
|
#include "ob_expr_hash.h"
|
|
#include "sql/engine/ob_exec_context.h"
|
|
|
|
using namespace oceanbase::common;
|
|
using namespace oceanbase::sql;
|
|
|
|
namespace oceanbase
|
|
{
|
|
namespace sql
|
|
{
|
|
|
|
ObExprHash::ObExprHash(ObIAllocator &alloc)
|
|
: ObExprOperator(alloc, T_FUN_SYS_HASH, N_HASH, MORE_THAN_ONE, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION,
|
|
INTERNAL_IN_MYSQL_MODE, INTERNAL_IN_ORACLE_MODE)
|
|
{
|
|
}
|
|
|
|
ObExprHash::~ObExprHash()
|
|
{
|
|
}
|
|
|
|
int ObExprHash::calc_result_typeN(ObExprResType &type,
|
|
ObExprResType *types,
|
|
int64_t param_num,
|
|
ObExprTypeCtx &type_ctx) const
|
|
{
|
|
int ret = OB_SUCCESS;
|
|
UNUSED(type_ctx);
|
|
type.set_uint64();
|
|
type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObUInt64Type].precision_);
|
|
type.set_scale(ObAccuracy::DDL_DEFAULT_ACCURACY[ObUInt64Type].scale_);
|
|
return ret;
|
|
}
|
|
|
|
int ObExprHash::calc_hash_value_expr(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res_datum)
|
|
{
|
|
int ret = OB_SUCCESS;
|
|
uint64_t hash_value = HASH_SEED;
|
|
for (int64_t i = 0; OB_SUCC(ret) && i < expr.arg_cnt_; ++i) {
|
|
ObDatum *datum = NULL;
|
|
if (OB_FAIL(expr.args_[i]->eval(ctx, datum))) {
|
|
LOG_WARN("failed to eval datum", K(ret));
|
|
} else {
|
|
ObExprHashFuncType hash_func = expr.args_[i]->basic_funcs_->murmur_hash_v2_;
|
|
if (OB_FAIL(hash_func(*datum, hash_value, hash_value))) {
|
|
LOG_WARN("failed to do hash", K(ret));
|
|
}
|
|
}
|
|
}
|
|
res_datum.set_uint(hash_value);
|
|
return ret;
|
|
}
|
|
|
|
int ObExprHash::calc_hash_value_expr_batch(
|
|
const ObExpr &expr, ObEvalCtx &ctx, const ObBitVector &skip, const int64_t batch_size)
|
|
{
|
|
int ret = OB_SUCCESS;
|
|
uint64_t hash_seed = HASH_SEED;
|
|
uint64_t *batch_hash_vals = reinterpret_cast<uint64_t *>(
|
|
ctx.frames_[expr.frame_idx_] + expr.res_buf_off_);
|
|
for (int64_t i = 0; OB_SUCC(ret) && i < expr.arg_cnt_; ++i) {
|
|
if (OB_FAIL(expr.args_[i]->eval_batch(ctx, skip, batch_size))) {
|
|
LOG_WARN("failed to eval batch datum", K(ret));
|
|
} else {
|
|
ObDatum *datums = expr.args_[i]->locate_batch_datums(ctx);
|
|
if (OB_ISNULL(datums)) {
|
|
ret = OB_ERR_UNEXPECTED;
|
|
LOG_WARN("failed to locate batch datums", K(ret));
|
|
} else {
|
|
ObBatchDatumHashFunc hash_func = expr.args_[i]->basic_funcs_->murmur_hash_v2_batch_;
|
|
hash_func(batch_hash_vals, datums, expr.args_[i]->is_batch_result(), skip, batch_size,
|
|
i > 0 ? batch_hash_vals: &hash_seed, i > 0);
|
|
}
|
|
}
|
|
}
|
|
if (OB_FAIL(ret)) {
|
|
// do nothing
|
|
} else {
|
|
ObBitVector &eval_flags = expr.get_evaluated_flags(ctx);
|
|
for (int64_t i = 0; OB_SUCC(ret) && i < batch_size; ++i) {
|
|
if (skip.at(i) || eval_flags.at(i)) {
|
|
continue;
|
|
} else {
|
|
expr.locate_expr_datum(ctx, i).set_uint(batch_hash_vals[i]);
|
|
eval_flags.set(i);
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int ObExprHash::cg_expr(ObExprCGCtx &expr_cg_ctx,
|
|
const ObRawExpr &raw_expr,
|
|
ObExpr &rt_expr) const
|
|
{
|
|
int ret = OB_SUCCESS;
|
|
UNUSED(raw_expr);
|
|
UNUSED(expr_cg_ctx);
|
|
if (0 == rt_expr.arg_cnt_) {
|
|
ret = OB_INVALID_ARGUMENT;
|
|
LOG_WARN("invalid argument number, param should be more than one", K(ret));
|
|
} else {
|
|
rt_expr.eval_func_ = &calc_hash_value_expr;
|
|
rt_expr.eval_batch_func_ = &calc_hash_value_expr_batch;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
} //namespace sql
|
|
} //namespace oceanbase
|