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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_EXE
#include "ob_shuffle_service.h"
#include "common/row/ob_row.h"
#include "share/schema/ob_table_schema.h"
#include "share/schema/ob_schema_struct.h"
#include "sql/engine/ob_exec_context.h"
#include "sql/engine/expr/ob_expr_func_part_hash.h"
using namespace oceanbase::common;
using namespace oceanbase::share::schema;
using namespace oceanbase::observer;
namespace oceanbase
{
namespace sql
{
// 问：为什么 ObShuffleService 里，key 分区的处理总是走一个单独路径？
//
// 答：实现原因。理论上二者可以统一。
// 2017年本逻辑的作者没有努力把二者融合起来，做了两段分支逻辑，导致了现在的局面。
//
// key 分区依赖于 key 表达式对多列做计算，然后对计算结果取模，
// hash 分区对一个 hash function 做计算，然后对计算结果取模。
//
// part_func, subpart_func 这两个参数是专门给 key 分区使用的，用他们计算出
// 一个值，然后再调用 hash 函数计算出最终的 part id。
//
// 对于 hash 分区，只需要传入 repart_columns, repart_sub_columns 即可，
// 其计算 hash 值的表达式是固定的函数，函数的参数就是 repart_columns 指定
//
//
int ObShuffleService::get_partition_ids(ObExecContext &exec_ctx,
const share::schema::ObTableSchema &table_schema,
const common::ObNewRow &row,
const ObSqlExpression &part_func,
const ObSqlExpression &subpart_func,
const ObIArray<ObTransmitRepartColumn> &repart_columns,
const ObIArray<ObTransmitRepartColumn> &repart_sub_columns,
int64_t &part_id,
int64_t &subpart_id,
bool &no_match_partiton)
{
int ret = OB_SUCCESS;
if (OB_FAIL(init_expr_ctx(exec_ctx))) {
LOG_WARN("Failed to init expr calculation context", K(ret));
} else if (OB_FAIL(get_part_id(exec_ctx, table_schema, row,
part_func, repart_columns, part_id))) {
LOG_WARN("failed to get part id", K(ret));
} else if (PARTITION_LEVEL_TWO != table_schema.get_part_level() ||
NO_MATCH_PARTITION == part_id) {
// do nothing
} else if (OB_FAIL(get_subpart_id(exec_ctx, table_schema, row, part_id, subpart_func,
repart_sub_columns, subpart_id))) {
LOG_WARN("failed to get subpart id", K(ret));
}
if (OB_SUCC(ret)) {
if (part_id == NO_MATCH_PARTITION || subpart_id == NO_MATCH_PARTITION) {
no_match_partiton = true;
}
}
LOG_DEBUG("get part id and subpart id", K(part_id), K(subpart_id), K(no_match_partiton));
return ret;
}
int ObShuffleService::get_part_id(ObExecContext &exec_ctx,
const share::schema::ObTableSchema &table_schema,
const common::ObNewRow &row,
const ObSqlExpression &part_func,
const ObIArray<ObTransmitRepartColumn> &repart_columns,
int64_t &part_id)
{
int ret = OB_SUCCESS;
if (table_schema.is_key_part()) {
if (OB_FAIL(get_key_part_id(exec_ctx, table_schema, row, part_func, part_id))) {
LOG_WARN("get key part id failed");
}
} else if (table_schema.is_list_part() ||
table_schema.is_range_part() ||
table_schema.is_hash_part()) {
if (OB_FAIL(get_non_key_partition_part_id(exec_ctx, table_schema, row,
repart_columns, part_id))) {
LOG_WARN("failed to get non key partition part id", K(ret));
}
} else {
ret = OB_NOT_IMPLEMENT;
LOG_WARN("this type of partition is not implement", K(ret));
}
return ret;
}
int ObShuffleService::get_key_part_id(ObExecContext &exec_ctx,
const share::schema::ObTableSchema &table_schema,
const common::ObNewRow &row,
const ObSqlExpression &part_func,
int64_t &part_id)
{
int ret = OB_SUCCESS;
UNUSED(exec_ctx);
int64_t calc_result = 0;
ObObj func_result;
int64_t part_count = table_schema.get_part_option().get_part_num();
//一级分区
if (part_count <= 0) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("the part num can not be null", K(part_count), K(part_func), K(ret));
} else if (OB_FAIL(part_func.calc(expr_ctx_, row, func_result))) {
LOG_WARN("Failed to calc hash expr", K(ret), K(row));
} else if (OB_FAIL(func_result.get_int(calc_result))) {
LOG_WARN("Fail to get int64 from result", K(func_result), K(ret));
} else if (calc_result < 0) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("Input arguments is invalid", K(calc_result), K(part_count), K(ret));
} else if (OB_FAIL(ObPartitionUtils::calc_hash_part_idx(calc_result, part_count, part_id))) {
LOG_WARN("calc_hash_part_idx failed", K(ret));
}
return ret;
}
int ObShuffleService::get_non_key_partition_part_id(ObExecContext &exec_ctx,
const ObTableSchema &table_schema,
const ObNewRow &row,
const ObIArray<ObTransmitRepartColumn> &repart_columns,
int64_t &part_id)
{
return OB_NOT_SUPPORTED;
}
int ObShuffleService::get_subpart_id(ObExecContext &exec_ctx,
const share::schema::ObTableSchema &table_schema,
const common::ObNewRow &row,
int64_t part_id,
const ObSqlExpression &subpart_func,
const ObIArray<ObTransmitRepartColumn> &repart_sub_columns,
int64_t &subpart_id)
{
int ret = OB_SUCCESS;
if (table_schema.is_key_subpart()) {
if (OB_FAIL(get_key_subpart_id(exec_ctx, table_schema, row,
part_id, subpart_func, subpart_id))) {
LOG_WARN("get key subpart id failed");
}
} else if (table_schema.is_list_subpart()
|| table_schema.is_range_subpart()
|| table_schema.is_hash_subpart()) {
if (OB_FAIL(get_non_key_subpart_id(exec_ctx, table_schema, row, part_id,
repart_sub_columns, subpart_id))) {
LOG_WARN("get range or hash subpart id failed");
}
} else {
ret = OB_NOT_IMPLEMENT;
LOG_WARN("we only support the range, range column, key, hash repartition exe", K(ret));
}
return ret;
}
// FIXME: 支持非模版化二级分区
int ObShuffleService::get_key_subpart_id(ObExecContext &exec_ctx,
const ObTableSchema &table_schema,
const ObNewRow &row,
int64_t part_id,
const ObSqlExpression &subpart_func,
int64_t &subpart_id)
{
return OB_NOT_SUPPORTED;
}
//FIXME:此处和22x实现不一致，需要check一下
int ObShuffleService::get_non_key_subpart_id(ObExecContext &exec_ctx,
const ObTableSchema &table_schema,
const ObNewRow &row,
int64_t part_id,
const ObIArray<ObTransmitRepartColumn> &repart_sub_columns,
int64_t &subpart_id)
{
return OB_NOT_SUPPORTED;
}
int ObShuffleService::get_repart_row(ObExecContext &exec_ctx,
const common::ObNewRow &in_row,
const ObIArray<ObTransmitRepartColumn> &repart_columns,
common::ObNewRow &out_row,
bool hash_part)
{
int ret = OB_SUCCESS;
UNUSED(exec_ctx);
if (current_cell_count_ < repart_columns.count()) {
current_cell_count_ = repart_columns.count();
row_cache_.cells_ = static_cast<ObObj*>(allocator_.alloc(sizeof(ObObj)*current_cell_count_));
}
row_cache_.count_ = repart_columns.count();
if (OB_ISNULL(row_cache_.cells_)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("alloc mem failed", K(ret));
} else {
for (int64_t i = 0; i < repart_columns.count() && OB_SUCC(ret); ++i) {
//为什么远端传过来的是int64?
int64_t idx = (repart_columns.at(i).index_);
row_cache_.cells_[i] = in_row.get_cell(idx);
}
if (OB_SUCC(ret)) {
out_row = row_cache_;
}
}
if (OB_SUCC(ret) && hash_part) {
/*
* create table t1 (c1 int, c2 int);
* insert into t1 values(1,1);
* 这里的1，1在进入之后会被先解析称为int64_t，也就是int type。
* 在真正插入存储之前会cast为真实类型也就是int32 type。
* 重分区时候会使用到这个接口，所以这里的类型也要打开int32 type类型。
*
* */
ObObj result;
if (OB_FAIL(ObExprFuncPartHash::calc_value(expr_ctx_, out_row.cells_, out_row.count_, result))) {
LOG_WARN("Failed to calc hash value", K(ret));
} else {
out_row.cells_[0] = result;
out_row.count_ = 1;
}
}
return ret;
}
int ObShuffleService::init_expr_ctx(ObExecContext &exec_ctx)
{
int ret = OB_SUCCESS;
ObSQLSessionInfo *my_session = NULL;
const ObTimeZoneInfo *tz_info = NULL;
int64_t tz_offset = 0;
if (nullptr != expr_ctx_.exec_ctx_) {
//Has been inited, do nothing.
} else if (OB_ISNULL(my_session = exec_ctx.get_my_session())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("session is NULL", K(ret));
} else if (OB_ISNULL(tz_info = get_timezone_info(my_session))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get tz info pointer failed", K(ret));
} else if (OB_FAIL(get_tz_offset(tz_info, tz_offset))) {
LOG_WARN("get tz offset failed", K(ret));
} else {
expr_ctx_.cast_mode_ = CM_WARN_ON_FAIL;
expr_ctx_.exec_ctx_ = &exec_ctx;
expr_ctx_.calc_buf_ = &exec_ctx.get_allocator();
expr_ctx_.phy_plan_ctx_ = exec_ctx.get_physical_plan_ctx();
expr_ctx_.my_session_ = my_session;
expr_ctx_.tz_offset_ = tz_offset;
EXPR_SET_CAST_CTX_MODE(expr_ctx_);
}
return ret;
}
}
}