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oceanbase/src/sql/engine/expr/ob_expr_uniform.cpp
obdev c5756c1799 [FEAT MERGE] Functional_index
2023-04-27 11:11:24 +00:00

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/**
* 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 "sql/engine/expr/ob_expr_uniform.h"
#include "sql/engine/ob_exec_context.h"
#include "lib/json_type/ob_json_base.h"
namespace oceanbase
{
using namespace common;
namespace sql
{
int ObExprUniform::ObExprUniformIntCtx::initialize(ObEvalCtx &ctx, const ObExpr &expr)
{
int ret = OB_SUCCESS;
ObDatum &p1 = expr.locate_param_datum(ctx, 0);
ObDatum &p2 = expr.locate_param_datum(ctx, 1);
if (p1.is_null() || p2.is_null()) {
ret = OB_INVALID_ARGUMENT;
LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform min/max value. must be a constant expression.");
} else {
int64_t a = p1.get_int();
int64_t b = p2.get_int();
std::uniform_int_distribution<int64_t>::param_type param(a, b);
int_dist_.param(param);
if (a > b) {
ret = OB_INVALID_ARGUMENT;
LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform min/max value. min value must be smaller than or equal to max value.");
}
}
return ret;
}
int ObExprUniform::ObExprUniformIntCtx::generate_next_value(int64_t seed, int64_t &res)
{
gen_.seed(seed);
res = int_dist_(gen_);
return OB_SUCCESS;
}
int ObExprUniform::ObExprUniformRealCtx::initialize(ObEvalCtx &ctx, const ObExpr &expr)
{
int ret = OB_SUCCESS;
ObDatum &p1 = expr.locate_param_datum(ctx, 0);
ObDatum &p2 = expr.locate_param_datum(ctx, 1);
if (p1.is_null() || p2.is_null()) {
ret = OB_INVALID_ARGUMENT;
LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform min/max value. must be a constant number.");
} else {
double a = p1.get_double();
double b = p2.get_double();
std::uniform_real_distribution<double>::param_type param(a, b);
real_dist_.param(param);
if (a > b) {
ret = OB_INVALID_ARGUMENT;
LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform min/max value. min value must be smaller than or equal to max value.");
}
}
return ret;
}
int ObExprUniform::ObExprUniformRealCtx::generate_next_value(int64_t seed, double &res)
{
gen_.seed(seed);
res = real_dist_(gen_);
return OB_SUCCESS;
}
ObExprUniform::ObExprUniform(common::ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_UNIFORM, "uniform", 3, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
{
}
ObExprUniform::~ObExprUniform()
{
}
int ObExprUniform::calc_result_type3(ObExprResType &result_type,
ObExprResType &min_type,
ObExprResType &max_type,
ObExprResType &rand_expr,
common::ObExprTypeCtx &type_ctx) const
{
UNUSED(type_ctx);
int ret = OB_SUCCESS;
if (lib::is_oracle_mode()) {
min_type.set_calc_type(ObDoubleType);
max_type.set_calc_type(ObDoubleType);
result_type.set_number();
result_type.set_precision(PRECISION_UNKNOWN_YET);
result_type.set_scale(ORA_NUMBER_SCALE_UNKNOWN_YET);
} else if (ob_is_integer_type(min_type.get_type()) && ob_is_integer_type(max_type.get_type())) {
min_type.set_calc_type(ObIntType);
max_type.set_calc_type(ObIntType);
result_type.set_int();
} else {
min_type.set_calc_type(ObDoubleType);
max_type.set_calc_type(ObDoubleType);
result_type.set_double();
}
rand_expr.set_calc_type(ObIntType);
return ret;
}
int ObExprUniform::eval_next_int_value(const ObExpr &expr,
ObEvalCtx &ctx,
ObDatum &res_datum)
{
int ret = OB_SUCCESS;
ObExprUniformIntCtx *uniform_ctx = NULL;
uint64_t op_id = expr.expr_ctx_id_;
ObExecContext &exec_ctx = ctx.exec_ctx_;
if (OB_FAIL(expr.eval_param_value(ctx))) {
LOG_WARN("expr.eval_param_value failed", K(ret));
} else if (OB_ISNULL(uniform_ctx = static_cast<ObExprUniformIntCtx *>(
exec_ctx.get_expr_op_ctx(op_id)))) {
if (OB_FAIL(exec_ctx.create_expr_op_ctx(op_id, uniform_ctx))) {
LOG_WARN("failed to create operator ctx", K(ret), K(op_id));
} else if (OB_ISNULL(uniform_ctx)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("uniform ctx is NULL", K(ret));
} else if (OB_FAIL(uniform_ctx->initialize(ctx, expr))) {
LOG_WARN("fail init uniform context", K(ret));
}
}
if (OB_SUCC(ret)) {
ObDatum &rand_val = expr.locate_param_datum(ctx, 2);
if (OB_UNLIKELY(rand_val.is_null())) {
res_datum.set_null();
} else {
int64_t seed = rand_val.get_int();
int64_t res = 0;
if (OB_FAIL(uniform_ctx->generate_next_value(seed, res))) {
LOG_WARN("fail generate next uniform value", K(ret), K(seed));
} else {
res_datum.set_int(res);
}
}
}
return ret;
}
int ObExprUniform::eval_next_real_value(const ObExpr &expr,
ObEvalCtx &ctx,
ObDatum &res_datum)
{
int ret = OB_SUCCESS;
ObExprUniformRealCtx *uniform_ctx = NULL;
uint64_t op_id = expr.expr_ctx_id_;
ObExecContext &exec_ctx = ctx.exec_ctx_;
if (OB_FAIL(expr.eval_param_value(ctx))) {
LOG_WARN("expr.eval_param_value failed", K(ret));
} else if (OB_ISNULL(uniform_ctx = static_cast<ObExprUniformRealCtx *>(
exec_ctx.get_expr_op_ctx(op_id)))) {
if (OB_FAIL(exec_ctx.create_expr_op_ctx(op_id, uniform_ctx))) {
LOG_WARN("failed to create operator ctx", K(ret), K(op_id));
} else if (OB_ISNULL(uniform_ctx)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("uniform ctx is NULL", K(ret));
} else if (OB_FAIL(uniform_ctx->initialize(ctx, expr))) {
LOG_WARN("fail init uniform context", K(ret));
}
}
if (OB_SUCC(ret)) {
ObDatum &rand_val = expr.locate_param_datum(ctx, 2);
if (OB_UNLIKELY(rand_val.is_null())) {
res_datum.set_null();
} else {
int64_t seed = rand_val.get_int();
double res = 0.0;
if (OB_FAIL(uniform_ctx->generate_next_value(seed, res))) {
LOG_WARN("fail generate next uniform value", K(ret), K(seed));
} else {
res_datum.set_double(res);
}
}
}
return ret;
}
// No need to introduce a native number solution. just reuse double solution,
// and convert the double result into number format
int ObExprUniform::eval_next_number_value(const ObExpr &expr,
ObEvalCtx &ctx,
ObDatum &res_datum)
{
int ret = OB_SUCCESS;
ObExprUniformRealCtx *uniform_ctx = NULL;
uint64_t op_id = expr.expr_ctx_id_;
ObExecContext &exec_ctx = ctx.exec_ctx_;
if (OB_FAIL(expr.eval_param_value(ctx))) {
LOG_WARN("expr.eval_param_value failed", K(ret));
} else if (OB_ISNULL(uniform_ctx = static_cast<ObExprUniformRealCtx *>(
exec_ctx.get_expr_op_ctx(op_id)))) {
if (OB_FAIL(exec_ctx.create_expr_op_ctx(op_id, uniform_ctx))) {
LOG_WARN("failed to create operator ctx", K(ret), K(op_id));
} else if (OB_ISNULL(uniform_ctx)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("uniform ctx is NULL", K(ret));
} else if (OB_FAIL(uniform_ctx->initialize(ctx, expr))) {
LOG_WARN("fail init uniform context", K(ret));
}
}
if (OB_SUCC(ret)) {
ObDatum &rand_val = expr.locate_param_datum(ctx, 2);
if (OB_UNLIKELY(rand_val.is_null())) {
res_datum.set_null();
} else {
int64_t seed = rand_val.get_int();
double d = 0.0;
number::ObNumber res;
char local_buff[number::ObNumber::MAX_BYTE_LEN];
ObDataBuffer local_alloc(local_buff, number::ObNumber::MAX_BYTE_LEN);
if (OB_FAIL(uniform_ctx->generate_next_value(seed, d))) {
LOG_WARN("fail generate next uniform value", K(ret), K(seed));
} else if (OB_FAIL(ObJsonBaseUtil::double_to_number(d, local_alloc, res))) {
LOG_WARN("fail convert double to number", K(seed), K(d));
} else {
res_datum.set_number(res);
}
}
}
return ret;
}
int ObExprUniform::cg_expr(ObExprCGCtx &expr_cg_ctx,
const ObRawExpr &raw_expr,
ObExpr &rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(expr_cg_ctx);
if (OB_UNLIKELY(3 != raw_expr.get_param_count())) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid param count for in expr", K(ret));
} else if (OB_ISNULL(raw_expr.get_param_expr(0)) ||
OB_ISNULL(raw_expr.get_param_expr(1))) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid null param expr", K(ret));
} else if (!raw_expr.get_param_expr(0)->is_const_expr()) {
ret = OB_INVALID_ARGUMENT;
LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform function's first argument. must be a constant expression.");
} else if (!raw_expr.get_param_expr(1)->is_const_expr()) {
ret = OB_INVALID_ARGUMENT;
LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform function's second argument. must be a constant expression.");
}
if (lib::is_oracle_mode()) {
rt_expr.eval_func_ = ObExprUniform::eval_next_number_value;
} else if (ob_is_integer_type(raw_expr.get_param_expr(0)->get_data_type())
&& ob_is_integer_type(raw_expr.get_param_expr(1)->get_data_type())) {
rt_expr.eval_func_ = ObExprUniform::eval_next_int_value;
} else {
rt_expr.eval_func_ = ObExprUniform::eval_next_real_value;
}
return ret;
}
} /* namespace sql */
} /* namespace oceanbase */
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