[FEAT MERGE] [v4.2] add table generator and several random utility functions
This commit is contained in:
raywill
278
src/sql/engine/expr/ob_expr_uniform.cpp
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278
src/sql/engine/expr/ob_expr_uniform.cpp
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/**
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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_uniform.h"
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#include "sql/engine/ob_exec_context.h"
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#include "lib/json_type/ob_json_base.h"
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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int ObExprUniform::ObExprUniformIntCtx::initialize(ObEvalCtx &ctx, const ObExpr &expr)
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{
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int ret = OB_SUCCESS;
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ObDatum &p1 = expr.locate_param_datum(ctx, 0);
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ObDatum &p2 = expr.locate_param_datum(ctx, 1);
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if (p1.is_null() || p2.is_null()) {
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ret = OB_INVALID_ARGUMENT;
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LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform min/max value. must be a constant expression.");
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} else {
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int64_t a = p1.get_int();
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int64_t b = p2.get_int();
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std::uniform_int_distribution<int64_t>::param_type param(a, b);
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int_dist_.param(param);
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if (a > b) {
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ret = OB_INVALID_ARGUMENT;
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LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform min/max value. min value must be smaller than or equal to max value.");
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}
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}
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return ret;
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}
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int ObExprUniform::ObExprUniformIntCtx::generate_next_value(int64_t seed, int64_t &res)
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{
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gen_.seed(seed);
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res = int_dist_(gen_);
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return OB_SUCCESS;
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}
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int ObExprUniform::ObExprUniformRealCtx::initialize(ObEvalCtx &ctx, const ObExpr &expr)
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{
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int ret = OB_SUCCESS;
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ObDatum &p1 = expr.locate_param_datum(ctx, 0);
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ObDatum &p2 = expr.locate_param_datum(ctx, 1);
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if (p1.is_null() || p2.is_null()) {
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ret = OB_INVALID_ARGUMENT;
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LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform min/max value. must be a constant number.");
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} else {
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double a = p1.get_double();
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double b = p2.get_double();
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std::uniform_real_distribution<double>::param_type param(a, b);
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real_dist_.param(param);
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if (a > b) {
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ret = OB_INVALID_ARGUMENT;
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LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform min/max value. min value must be smaller than or equal to max value.");
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}
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}
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return ret;
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}
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int ObExprUniform::ObExprUniformRealCtx::generate_next_value(int64_t seed, double &res)
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{
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gen_.seed(seed);
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res = real_dist_(gen_);
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return OB_SUCCESS;
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}
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ObExprUniform::ObExprUniform(common::ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_UNIFORM, "uniform", 3, NOT_ROW_DIMENSION)
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{
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}
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ObExprUniform::~ObExprUniform()
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{
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}
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int ObExprUniform::calc_result_type3(ObExprResType &result_type,
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ObExprResType &min_type,
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ObExprResType &max_type,
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ObExprResType &rand_expr,
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common::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 (lib::is_oracle_mode()) {
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min_type.set_calc_type(ObDoubleType);
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max_type.set_calc_type(ObDoubleType);
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result_type.set_number();
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result_type.set_precision(PRECISION_UNKNOWN_YET);
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result_type.set_scale(ORA_NUMBER_SCALE_UNKNOWN_YET);
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} else if (ob_is_integer_type(min_type.get_type()) && ob_is_integer_type(max_type.get_type())) {
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min_type.set_calc_type(ObIntType);
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max_type.set_calc_type(ObIntType);
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result_type.set_int();
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} else {
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min_type.set_calc_type(ObDoubleType);
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max_type.set_calc_type(ObDoubleType);
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result_type.set_double();
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}
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rand_expr.set_calc_type(ObIntType);
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return ret;
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}
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int ObExprUniform::eval_next_int_value(const ObExpr &expr,
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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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ObExprUniformIntCtx *uniform_ctx = NULL;
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uint64_t op_id = expr.expr_ctx_id_;
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ObExecContext &exec_ctx = ctx.exec_ctx_;
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if (OB_FAIL(expr.eval_param_value(ctx))) {
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LOG_WARN("expr.eval_param_value failed", K(ret));
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} else if (OB_ISNULL(uniform_ctx = static_cast<ObExprUniformIntCtx *>(
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exec_ctx.get_expr_op_ctx(op_id)))) {
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if (OB_FAIL(exec_ctx.create_expr_op_ctx(op_id, uniform_ctx))) {
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LOG_WARN("failed to create operator ctx", K(ret), K(op_id));
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} else if (OB_ISNULL(uniform_ctx)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("uniform ctx is NULL", K(ret));
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} else if (OB_FAIL(uniform_ctx->initialize(ctx, expr))) {
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LOG_WARN("fail init uniform context", K(ret));
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}
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}
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if (OB_SUCC(ret)) {
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ObDatum &rand_val = expr.locate_param_datum(ctx, 2);
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if (OB_UNLIKELY(rand_val.is_null())) {
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res_datum.set_null();
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} else {
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int64_t seed = rand_val.get_int();
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int64_t res = 0;
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if (OB_FAIL(uniform_ctx->generate_next_value(seed, res))) {
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LOG_WARN("fail generate next uniform value", K(ret), K(seed));
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} else {
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res_datum.set_int(res);
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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 ObExprUniform::eval_next_real_value(const ObExpr &expr,
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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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ObExprUniformRealCtx *uniform_ctx = NULL;
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uint64_t op_id = expr.expr_ctx_id_;
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ObExecContext &exec_ctx = ctx.exec_ctx_;
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if (OB_FAIL(expr.eval_param_value(ctx))) {
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LOG_WARN("expr.eval_param_value failed", K(ret));
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} else if (OB_ISNULL(uniform_ctx = static_cast<ObExprUniformRealCtx *>(
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exec_ctx.get_expr_op_ctx(op_id)))) {
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if (OB_FAIL(exec_ctx.create_expr_op_ctx(op_id, uniform_ctx))) {
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LOG_WARN("failed to create operator ctx", K(ret), K(op_id));
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} else if (OB_ISNULL(uniform_ctx)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("uniform ctx is NULL", K(ret));
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} else if (OB_FAIL(uniform_ctx->initialize(ctx, expr))) {
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LOG_WARN("fail init uniform context", K(ret));
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}
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}
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if (OB_SUCC(ret)) {
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ObDatum &rand_val = expr.locate_param_datum(ctx, 2);
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if (OB_UNLIKELY(rand_val.is_null())) {
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res_datum.set_null();
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} else {
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int64_t seed = rand_val.get_int();
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double res = 0.0;
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if (OB_FAIL(uniform_ctx->generate_next_value(seed, res))) {
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LOG_WARN("fail generate next uniform value", K(ret), K(seed));
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} else {
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res_datum.set_double(res);
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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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// No need to introduce a native number solution. just reuse double solution,
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// and convert the double result into number format
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int ObExprUniform::eval_next_number_value(const ObExpr &expr,
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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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ObExprUniformRealCtx *uniform_ctx = NULL;
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uint64_t op_id = expr.expr_ctx_id_;
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ObExecContext &exec_ctx = ctx.exec_ctx_;
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if (OB_FAIL(expr.eval_param_value(ctx))) {
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LOG_WARN("expr.eval_param_value failed", K(ret));
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} else if (OB_ISNULL(uniform_ctx = static_cast<ObExprUniformRealCtx *>(
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exec_ctx.get_expr_op_ctx(op_id)))) {
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if (OB_FAIL(exec_ctx.create_expr_op_ctx(op_id, uniform_ctx))) {
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LOG_WARN("failed to create operator ctx", K(ret), K(op_id));
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} else if (OB_ISNULL(uniform_ctx)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("uniform ctx is NULL", K(ret));
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} else if (OB_FAIL(uniform_ctx->initialize(ctx, expr))) {
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LOG_WARN("fail init uniform context", K(ret));
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}
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}
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if (OB_SUCC(ret)) {
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ObDatum &rand_val = expr.locate_param_datum(ctx, 2);
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if (OB_UNLIKELY(rand_val.is_null())) {
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res_datum.set_null();
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} else {
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int64_t seed = rand_val.get_int();
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double d = 0.0;
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number::ObNumber res;
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char local_buff[number::ObNumber::MAX_BYTE_LEN];
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ObDataBuffer local_alloc(local_buff, number::ObNumber::MAX_BYTE_LEN);
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if (OB_FAIL(uniform_ctx->generate_next_value(seed, d))) {
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LOG_WARN("fail generate next uniform value", K(ret), K(seed));
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} else if (OB_FAIL(ObJsonBaseUtil::double_to_number(d, local_alloc, res))) {
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LOG_WARN("fail convert double to number", K(seed), K(d));
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} else {
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res_datum.set_number(res);
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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 ObExprUniform::cg_expr(ObExprCGCtx &expr_cg_ctx,
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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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if (OB_UNLIKELY(3 != raw_expr.get_param_count())) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid param count for in expr", K(ret));
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} else if (OB_ISNULL(raw_expr.get_param_expr(0)) ||
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OB_ISNULL(raw_expr.get_param_expr(1))) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid null param expr", K(ret));
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} else if (!raw_expr.get_param_expr(0)->is_const_expr()) {
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ret = OB_INVALID_ARGUMENT;
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LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform function's first argument. must be a constant expression.");
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} else if (!raw_expr.get_param_expr(1)->is_const_expr()) {
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ret = OB_INVALID_ARGUMENT;
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LOG_USER_ERROR(OB_INVALID_ARGUMENT, "uniform function's second argument. must be a constant expression.");
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}
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if (lib::is_oracle_mode()) {
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rt_expr.eval_func_ = ObExprUniform::eval_next_number_value;
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} else if (ob_is_integer_type(raw_expr.get_param_expr(0)->get_data_type())
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&& ob_is_integer_type(raw_expr.get_param_expr(1)->get_data_type())) {
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rt_expr.eval_func_ = ObExprUniform::eval_next_int_value;
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} else {
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rt_expr.eval_func_ = ObExprUniform::eval_next_real_value;
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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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