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src/sql/engine/expr/ob_expr_extract.cpp Normal file
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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_extract.h"
#include "lib/allocator/ob_allocator.h"
#include "lib/time/ob_time_utility.h"
#include "lib/timezone/ob_time_convert.h"
#include "lib/ob_name_def.h"
#include "lib/ob_date_unit_type.h"
#include "sql/session/ob_sql_session_info.h"
#include "sql/engine/ob_exec_context.h"
#include "sql/engine/expr/ob_datum_cast.h"
#define STR_LEN 20
namespace oceanbase {
using namespace common;
namespace sql {
ObExprExtract::ObExprExtract(ObIAllocator& alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_EXTRACT, N_EXTRACT, 2, NOT_ROW_DIMENSION)
{}
ObExprExtract::~ObExprExtract()
{}
int ObExprExtract::calc_result_type2(
ObExprResType& type, ObExprResType& date_unit, ObExprResType& date, ObExprTypeCtx& type_ctx) const
{
int ret = OB_SUCCESS;
if (share::is_oracle_mode()) {
if (OB_FAIL(set_result_type_oracle(type_ctx, date_unit, type))) {
LOG_WARN("set_result_type_oracle failed", K(ret), K(type));
}
} else {
if (ob_is_enumset_tc(date.get_type())) {
date.set_calc_type(ObVarcharType);
}
type.set_int();
type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
type.set_precision(ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
}
return ret;
}
int ObExprExtract::set_result_type_oracle(
ObExprTypeCtx& type_ctx, const ObExprResType& date_unit, ObExprResType& res_type) const
{
int ret = OB_SUCCESS;
bool is_varchar = false;
const ObObj& date_unit_obj = date_unit.get_param();
if (false == date_unit_obj.is_null_oracle()) {
ObDateUnitType date_unit_val = static_cast<ObDateUnitType>(date_unit_obj.get_int());
if (DATE_UNIT_TIMEZONE_ABBR == date_unit_val || DATE_UNIT_TIMEZONE_REGION == date_unit_val) {
is_varchar = true;
}
}
if (is_varchar) {
ObCollationType collation_connection = type_ctx.get_coll_type();
if (CS_TYPE_INVALID == collation_connection) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid connection cs_type", K(ret), K(collation_connection));
} else {
res_type.set_varchar();
res_type.set_collation_type(collation_connection);
res_type.set_collation_level(CS_LEVEL_IMPLICIT);
}
} else {
res_type.set_number();
res_type.set_precision(PRECISION_UNKNOWN_YET);
res_type.set_scale(NUMBER_SCALE_UNKNOWN_YET);
}
return ret;
}
template <typename T, bool with_date>
inline int obj_to_time(
const T& date, ObObjType type, const ObTimeZoneInfo* tz_info, ObTime& ob_time, const int64_t cur_ts_value);
template <>
inline int obj_to_time<ObObj, true>(
const ObObj& date, ObObjType type, const ObTimeZoneInfo* tz_info, ObTime& ob_time, const int64_t cur_ts_value)
{
UNUSED(type);
UNUSED(cur_ts_value);
return ob_obj_to_ob_time_with_date(date, tz_info, ob_time);
}
template <>
inline int obj_to_time<ObObj, false>(
const ObObj& date, ObObjType type, const ObTimeZoneInfo* tz_info, ObTime& ob_time, const int64_t cur_ts_value)
{
UNUSED(type);
UNUSED(cur_ts_value);
return ob_obj_to_ob_time_without_date(date, tz_info, ob_time);
}
template <>
inline int obj_to_time<ObDatum, true>(
const ObDatum& date, ObObjType type, const ObTimeZoneInfo* tz_info, ObTime& ob_time, const int64_t cur_ts_value)
{
return ob_datum_to_ob_time_with_date(date, type, tz_info, ob_time, cur_ts_value);
}
template <>
inline int obj_to_time<ObDatum, false>(
const ObDatum& date, ObObjType type, const ObTimeZoneInfo* tz_info, ObTime& ob_time, const int64_t cur_ts_value)
{
UNUSED(cur_ts_value);
return ob_datum_to_ob_time_without_date(date, type, tz_info, ob_time);
}
template <typename T>
int ObExprExtract::calc(T& result, const int64_t date_unit, const T& date, ObObjType date_type,
const ObCastMode cast_mode, const ObTimeZoneInfo* tz_info, const int64_t cur_ts_value)
{
int ret = OB_SUCCESS;
struct ObTime ob_time;
memset(&ob_time, 0, sizeof(ob_time));
if (date.is_null()) {
result.set_null();
} else {
int ret = OB_SUCCESS;
int warning = OB_SUCCESS;
int& cast_ret = CM_IS_ERROR_ON_FAIL(cast_mode) ? ret : warning;
ObDateUnitType unit_val = static_cast<ObDateUnitType>(date_unit);
switch (unit_val) {
case DATE_UNIT_DAY:
case DATE_UNIT_WEEK:
case DATE_UNIT_MONTH:
case DATE_UNIT_QUARTER:
case DATE_UNIT_YEAR:
case DATE_UNIT_DAY_MICROSECOND:
case DATE_UNIT_DAY_SECOND:
case DATE_UNIT_DAY_MINUTE:
case DATE_UNIT_DAY_HOUR:
case DATE_UNIT_YEAR_MONTH:
cast_ret = obj_to_time<T, true>(date, date_type, tz_info, ob_time, cur_ts_value);
break;
default:
cast_ret = obj_to_time<T, false>(date, date_type, tz_info, ob_time, cur_ts_value);
}
if (OB_SUCC(ret)) {
if (OB_LIKELY(OB_SUCCESS == warning)) {
ObDateUnitType unit_type = static_cast<ObDateUnitType>(date_unit);
int64_t value = ObTimeConverter::ob_time_to_int_extract(ob_time, unit_type);
result.set_int(value);
} else {
result.set_null();
}
}
}
return ret;
}
template <typename T>
void ob_set_string(T& result, ObString str);
template <>
void ob_set_string<ObDatum>(ObDatum& result, ObString str)
{
result.set_string(str);
}
template <>
void ob_set_string<ObObj>(ObObj& result, ObString str)
{
result.set_varchar(str);
}
template <typename T>
ObOTimestampData get_otimestamp_value(const T& param, ObObjType type);
template <>
ObOTimestampData get_otimestamp_value<ObObj>(const ObObj& param, ObObjType type)
{
UNUSED(type);
return param.get_otimestamp_value();
}
template <>
ObOTimestampData get_otimestamp_value<ObDatum>(const ObDatum& param, ObObjType type)
{
return ObTimestampTZType == type ? param.get_otimestamp_tz() : param.get_otimestamp_tiny();
}
template <typename T>
int ObExprExtract::calc_oracle(T& result, const int64_t date_unit, const T& date, ObObjType type,
const ObSQLSessionInfo* session, ObIAllocator* calc_buf)
{
int ret = OB_SUCCESS;
if (date.is_null()) {
result.set_null();
} else {
ObDateUnitType unit_val = static_cast<ObDateUnitType>(date_unit);
bool extract_timezone_field = (DATE_UNIT_TIMEZONE_ABBR == unit_val) || (DATE_UNIT_TIMEZONE_HOUR == unit_val) ||
(DATE_UNIT_TIMEZONE_MINUTE == unit_val) || (DATE_UNIT_TIMEZONE_REGION == unit_val);
bool extract_time_field =
(DATE_UNIT_HOUR == unit_val) || (DATE_UNIT_MINUTE == unit_val) || (DATE_UNIT_SECOND == unit_val);
bool extract_day_field = (DATE_UNIT_DAY == unit_val);
bool extract_year_month_field = (DATE_UNIT_YEAR == unit_val) || (DATE_UNIT_MONTH == unit_val);
bool valid_expr = false;
// 1. check the extraction field is valid
switch (type) {
// see oracle doc EXTRACT (datetime) :
// https://docs.oracle.com/cd/B28359_01/server.111/b28286/functions052.htm#SQLRF00639
case ObDateTimeType:
valid_expr = !extract_timezone_field && !extract_time_field;
break;
case ObTimestampNanoType:
valid_expr = !extract_timezone_field;
break;
case ObTimestampLTZType:
case ObTimestampTZType:
valid_expr = true;
break;
case ObIntervalYMType:
valid_expr = !extract_timezone_field && !extract_day_field && !extract_time_field;
break;
case ObIntervalDSType:
valid_expr = !extract_timezone_field && !extract_year_month_field;
break;
default:
valid_expr = false;
}
if (OB_UNLIKELY(!valid_expr)) {
ret = OB_ERR_EXTRACT_FIELD_INVALID; // ORA-30076: invalid extract field for extract source
LOG_WARN("invalid extract field for extract source",
K(ret),
"requested field",
ob_date_unit_type_str(unit_val),
"expr type",
type);
}
ObTime ob_time;
ObIntervalParts interval_part;
// 2. convert to time struct
if (OB_SUCC(ret)) {
switch (ob_obj_type_class(type)) {
case ObDateTimeTC:
if (OB_FAIL(ObTimeConverter::datetime_to_ob_time(date.get_datetime(), get_timezone_info(session), ob_time))) {
LOG_WARN("fail to convert date to ob time", K(ret), K(date));
}
break;
case ObOTimestampTC:
if (OB_FAIL(ObTimeConverter::otimestamp_to_ob_time(type,
get_otimestamp_value(date, type),
get_timezone_info(session),
ob_time,
ObTimestampLTZType != type))) {
LOG_WARN("fail to convert otimestamp to ob time", K(ret), K(date));
}
break;
case ObIntervalTC:
if (ObIntervalYMType == type) {
ObTimeConverter::interval_ym_to_display_part(date.get_interval_ym(), interval_part);
} else {
ObTimeConverter::interval_ds_to_display_part(date.get_interval_ds(), interval_part);
}
break;
default:
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected type class", K(ret), K(date));
}
}
// 3. get result interger or string
int64_t result_value = INT64_MIN;
int64_t fsecond = INT64_MIN;
ObString result_str;
if (OB_SUCC(ret)) {
bool is_interval_tc = (ObIntervalTC == ob_obj_type_class(type));
switch (unit_val) {
case DATE_UNIT_YEAR:
result_value =
is_interval_tc ? interval_part.get_part_value(ObIntervalParts::YEAR_PART) : ob_time.parts_[DT_YEAR];
break;
case DATE_UNIT_MONTH:
result_value =
is_interval_tc ? interval_part.get_part_value(ObIntervalParts::MONTH_PART) : ob_time.parts_[DT_MON];
break;
case DATE_UNIT_DAY:
result_value =
is_interval_tc ? interval_part.get_part_value(ObIntervalParts::DAY_PART) : ob_time.parts_[DT_MDAY];
break;
case DATE_UNIT_HOUR:
result_value =
is_interval_tc ? interval_part.get_part_value(ObIntervalParts::HOUR_PART) : ob_time.parts_[DT_HOUR];
break;
case DATE_UNIT_MINUTE:
result_value =
is_interval_tc ? interval_part.get_part_value(ObIntervalParts::MINUTE_PART) : ob_time.parts_[DT_MIN];
break;
case DATE_UNIT_SECOND:
result_value =
is_interval_tc ? interval_part.get_part_value(ObIntervalParts::SECOND_PART) : ob_time.parts_[DT_SEC];
fsecond = is_interval_tc ? interval_part.get_part_value(ObIntervalParts::FRECTIONAL_SECOND_PART)
: ob_time.parts_[DT_USEC];
break;
case DATE_UNIT_TIMEZONE_HOUR:
result_value = ob_time.parts_[DT_OFFSET_MIN] / 60;
break;
case DATE_UNIT_TIMEZONE_MINUTE:
result_value = ob_time.parts_[DT_OFFSET_MIN] % 60;
break;
case DATE_UNIT_TIMEZONE_REGION:
result_str = ob_time.get_tz_name_str();
if (result_str.empty()) {
result_str = ObString("UNKNOWN");
}
break;
case DATE_UNIT_TIMEZONE_ABBR:
result_str = ob_time.get_tzd_abbr_str();
if (result_str.empty()) {
result_str = ObString("UNK");
}
break;
default:
ret = OB_ERR_UNEXPECTED;
LOG_WARN("invalid field for extract", K(ret), K(unit_val));
}
}
if (OB_SUCC(ret)) {
if (result_value != INT64_MIN) {
// interger result
number::ObNumber res_number;
number::ObNumber res_with_fsecond_number;
number::ObNumber fs_value;
number::ObNumber power10;
number::ObNumber fs_number;
ObIAllocator* allocator = NULL;
if (OB_ISNULL(allocator = calc_buf)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("calc buf is null", K(ret));
} else if (OB_FAIL(res_number.from(result_value, *allocator))) {
LOG_WARN("fail to convert interger to ob number", K(ret));
} else if (fsecond != INT64_MIN) {
if (OB_FAIL(fs_value.from(fsecond, *allocator))) {
LOG_WARN("fail to convert to ob number", K(ret));
} else if (OB_FAIL(power10.from(static_cast<int64_t>(ObIntervalDSValue::MAX_FS_VALUE), *allocator))) {
LOG_WARN("failed to round number", K(ret));
} else if (OB_FAIL(fs_value.div(power10, fs_number, *allocator))) {
LOG_WARN("fail to div fs", K(ret));
} else if (OB_FAIL(res_number.add(fs_number, res_with_fsecond_number, *allocator))) {
LOG_WARN("fail to add fsecond", K(ret));
} else {
result.set_number(res_with_fsecond_number);
}
} else {
result.set_number(res_number);
}
} else {
ob_set_string(result, result_str);
}
}
}
return ret;
}
int ObExprExtract::calc_result2(ObObj& result, const ObObj& date_unit, const ObObj& date, ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
if (share::is_oracle_mode()) {
ret = calc_oracle(result, date_unit.get_int(), date, date.get_type(), expr_ctx.my_session_, expr_ctx.calc_buf_);
result.set_collation(result_type_);
} else {
EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NULL_ON_WARN);
ret = calc(result,
date_unit.get_int(),
date,
date.get_type(),
cast_ctx.cast_mode_,
cast_ctx.dtc_params_.tz_info_,
get_cur_time(expr_ctx.phy_plan_ctx_));
}
return ret;
}
int ObExprExtract::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
UNUSED(op_cg_ctx);
UNUSED(raw_expr);
int ret = OB_SUCCESS;
if (rt_expr.arg_cnt_ != 2) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("extract expr should have 2 params", K(ret), K(rt_expr.arg_cnt_));
} else if (OB_ISNULL(rt_expr.args_) || OB_ISNULL(rt_expr.args_[0]) || OB_ISNULL(rt_expr.args_[1])) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("children of extract expr is null", K(ret), K(rt_expr.args_));
} else {
if (is_oracle_mode()) {
rt_expr.eval_func_ = ObExprExtract::calc_extract_oracle;
} else {
rt_expr.eval_func_ = ObExprExtract::calc_extract_mysql;
}
}
return ret;
}
int ObExprExtract::calc_extract_oracle(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
int ret = OB_SUCCESS;
ObDatum* param_datum1 = NULL;
ObDatum* param_datum2 = NULL;
const ObSQLSessionInfo* session = NULL;
if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("session is null", K(ret));
} else if (OB_FAIL(expr.args_[0]->eval(ctx, param_datum1))) {
LOG_WARN("eval param1 value failed");
} else if (OB_FAIL(expr.args_[1]->eval(ctx, param_datum2))) {
LOG_WARN("eval param2 value failed");
} else {
ObDatum* result = static_cast<ObDatum*>(&expr_datum);
ret = calc_oracle(*result,
param_datum1->get_int(),
*param_datum2,
expr.args_[1]->datum_meta_.type_,
session,
&ctx.get_reset_tmp_alloc());
}
return ret;
}
int ObExprExtract::calc_extract_mysql(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
int ret = OB_SUCCESS;
ObDatum* param_datum1 = NULL;
ObDatum* param_datum2 = NULL;
const ObSQLSessionInfo* session = NULL;
if (OB_ISNULL(session = ctx.exec_ctx_.get_my_session())) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("session is null", K(ret));
} else if (OB_FAIL(expr.args_[0]->eval(ctx, param_datum1))) {
LOG_WARN("eval param1 value failed");
} else if (OB_FAIL(expr.args_[1]->eval(ctx, param_datum2))) {
LOG_WARN("eval param2 value failed");
} else {
ObDatum* result = static_cast<ObDatum*>(&expr_datum);
uint64_t cast_mode = 0;
ObSQLUtils::get_default_cast_mode(session->get_stmt_type(), session, cast_mode);
ret = ObExprExtract::calc(*result,
param_datum1->get_int(),
*param_datum2,
expr.args_[1]->datum_meta_.type_,
cast_mode,
get_timezone_info(session),
get_cur_time(ctx.exec_ctx_.get_physical_plan_ctx()));
}
return ret;
}
} // namespace sql
} // namespace oceanbase