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src/sql/engine/expr/ob_expr_str_to_date.cpp
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301
src/sql/engine/expr/ob_expr_str_to_date.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_str_to_date.h"
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#include "lib/timezone/ob_time_convert.h"
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#include "lib/ob_name_def.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "sql/engine/ob_exec_context.h"
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namespace oceanbase {
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using namespace common;
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namespace sql {
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ObExprStrToDate::ObExprStrToDate(ObIAllocator& alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_STR_TO_DATE, N_STR_TO_DATE, 2, NOT_ROW_DIMENSION)
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{}
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ObExprStrToDate::~ObExprStrToDate()
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{}
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int ObExprStrToDate::calc_result_type2(
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ObExprResType& type, ObExprResType& date, ObExprResType& format, ObExprTypeCtx& type_ctx) const
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{
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UNUSED(type_ctx);
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UNUSED(date);
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int ret = OB_SUCCESS;
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if (OB_UNLIKELY(ObNullTC == format.get_type_class())) {
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type.set_datetime();
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type.set_scale(MAX_SCALE_FOR_TEMPORAL);
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type.set_precision(DATETIME_MIN_LENGTH + MAX_SCALE_FOR_TEMPORAL);
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} else {
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ObObj format_obj = format.get_param();
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if (OB_UNLIKELY(format_obj.is_null())) {
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type.set_datetime();
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type.set_scale(MAX_SCALE_FOR_TEMPORAL);
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type.set_precision(DATETIME_MIN_LENGTH + MAX_SCALE_FOR_TEMPORAL);
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} else if (!format_obj.is_string_type()) {
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type.set_datetime();
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type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
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type.set_precision(DATETIME_MIN_LENGTH + DEFAULT_SCALE_FOR_INTEGER);
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} else {
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ObString format_str = format_obj.get_varchar();
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bool has_date = false;
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bool has_time = false;
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uint32_t pos = 0;
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pos = ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%a", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%b", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%c", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%D", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%d", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%e", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%j", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%M", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%m", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%U", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%u", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%V", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%v", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%W", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%w", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%X", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%x", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%Y", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%y", 2, 1);
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if (pos > 0) {
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has_date = true;
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}
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pos = 0;
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pos = ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%f", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%H", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%h", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%I", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%i", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%k", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%l", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%p", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%r", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%S", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%s", 2, 1) +
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ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%T", 2, 1);
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if (pos > 0) {
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has_time = true;
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}
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pos = ObCharset::locate(format_obj.get_collation_type(), format_str.ptr(), format_str.length(), "%f", 2, 1);
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if (0 == pos) {
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type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
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} else {
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type.set_scale(MAX_SCALE_FOR_TEMPORAL);
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}
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if (!has_time) {
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type.set_date();
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type.set_precision(static_cast<ObPrecision>(DATE_MIN_LENGTH + type.get_scale()));
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} else if (!has_date) {
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type.set_time();
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type.set_precision(static_cast<ObPrecision>(TIME_MIN_LENGTH + type.get_scale()));
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} else {
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type.set_datetime();
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type.set_precision(static_cast<ObPrecision>(DATETIME_MIN_LENGTH + type.get_scale()));
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}
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}
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}
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if (OB_SUCC(ret)) {
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if (ob_is_enumset_tc(date.get_type())) {
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date.set_calc_type(ObVarcharType);
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}
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if (ob_is_enumset_tc(format.get_type())) {
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format.set_calc_type(ObVarcharType);
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}
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const ObSQLSessionInfo* session = dynamic_cast<const ObSQLSessionInfo*>(type_ctx.get_session());
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if (OB_ISNULL(session)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("cast basic session to sql session info failed", K(ret));
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} else if (session->use_static_typing_engine()) {
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date.set_calc_type(ObVarcharType);
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format.set_calc_type(ObVarcharType);
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}
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}
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return ret;
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}
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int ObExprStrToDate::calc_result2(ObObj& result, const ObObj& date, const ObObj& format, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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ObString date_str;
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ObString format_str;
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int64_t value = 0;
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if (OB_UNLIKELY(ObNullType == date.get_type() || ObNullType == format.get_type())) {
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result.set_null();
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} else {
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EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
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EXPR_GET_VARCHAR_V2(date, date_str);
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EXPR_GET_VARCHAR_V2(format, format_str);
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if (OB_SUCC(ret)) {
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ObTimeConvertCtx cvrt_ctx(TZ_INFO(expr_ctx.my_session_), false);
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if (OB_FAIL(ObTimeConverter::str_to_datetime_format(date_str, format_str, cvrt_ctx, value))) {
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LOG_WARN("convert str to date failed", K(date), K(format), K(ret));
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if (CM_IS_WARN_ON_FAIL(expr_ctx.cast_mode_)) {
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if (OB_INVALID_DATE_FORMAT == ret) {
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ret = OB_SUCCESS;
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result.set_date(ObTimeConverter::ZERO_DATE);
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} else if (OB_INVALID_DATE_VALUE == ret) {
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ret = OB_SUCCESS;
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result.set_null();
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}
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}
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} else {
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result.set_datetime(value);
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const ObObj* obj_point = NULL;
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EXPR_CAST_OBJ_V2(get_result_type().get_type(), result, obj_point);
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if (OB_SUCC(ret) && OB_LIKELY(NULL != obj_point)) {
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result = *obj_point;
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} else {
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LOG_WARN("fail to cast object", K(result), K(get_result_type().get_type()), K(ret));
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}
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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 ObExprOracleToDate::set_my_result_from_ob_time(ObExprCtx& expr_ctx, ObTime& ob_time, ObObj& result) const
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{
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int ret = OB_SUCCESS;
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ObTimeConvertCtx time_cvrt_ctx(get_timezone_info(expr_ctx.my_session_), false);
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ObDateTime result_value;
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if (OB_FAIL(ObTimeConverter::ob_time_to_datetime(ob_time, time_cvrt_ctx, result_value))) {
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LOG_WARN("failed to convert ob time to datetime", K(ret));
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} else {
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result.set_datetime(result_value);
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result.set_scale(0);
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}
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return ret;
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}
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static int calc(const ObExpr& expr, ObEvalCtx& ctx, bool& is_null, int64_t& res_int)
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{
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int ret = OB_SUCCESS;
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is_null = false;
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res_int = 0;
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ObDatum* date_datum = NULL;
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ObDatum* fmt_datum = NULL;
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const ObSQLSessionInfo* session = ctx.exec_ctx_.get_my_session();
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if (OB_ISNULL(session)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("session is NULL", K(ret));
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} else if (OB_FAIL(expr.args_[0]->eval(ctx, date_datum)) || OB_FAIL(expr.args_[1]->eval(ctx, fmt_datum))) {
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LOG_WARN("eval arg failed", K(ret), KP(date_datum), KP(fmt_datum), K(expr));
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} else if (date_datum->is_null() || fmt_datum->is_null()) {
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is_null = true;
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} else {
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const ObString& date_str = date_datum->get_string();
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const ObString& fmt_str = fmt_datum->get_string();
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ObTimeConvertCtx cvrt_ctx(TZ_INFO(session), false);
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if (OB_FAIL(ObTimeConverter::str_to_datetime_format(date_str, fmt_str, cvrt_ctx, res_int))) {
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int tmp_ret = ret;
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ObCastMode def_cast_mode = CM_NONE;
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if (OB_FAIL(ObSQLUtils::get_default_cast_mode(session->get_stmt_type(), session, def_cast_mode))) {
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LOG_WARN("get_def_cast_mode failed", K(ret), "ret of str_to_datetime_format is", tmp_ret);
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} else {
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if (CM_IS_WARN_ON_FAIL(def_cast_mode)) {
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if (OB_INVALID_DATE_FORMAT == tmp_ret) {
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ret = OB_SUCCESS;
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// if res type is not datetime, will call ObTimeConverter::datetime_to_time()
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// or ObTimeConverter::datetime_to_date()
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res_int = ObTimeConverter::ZERO_DATETIME;
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} else if (OB_INVALID_DATE_VALUE == tmp_ret) {
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ret = OB_SUCCESS;
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is_null = true;
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}
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}
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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 calc_str_to_date_expr_date(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
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{
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int ret = OB_SUCCESS;
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bool is_null = false;
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int64_t datetime_int = 0;
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int32_t date_int = 0;
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if (OB_FAIL(calc(expr, ctx, is_null, datetime_int))) {
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LOG_WARN("calc str_to_date failed", K(ret), K(expr));
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} else if (is_null) {
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res_datum.set_null();
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} else if (OB_FAIL(ObTimeConverter::datetime_to_date(datetime_int, NULL, date_int))) {
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LOG_WARN("datetime_to_date failed", K(ret), K(datetime_int));
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} else {
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res_datum.set_date(date_int);
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}
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return ret;
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}
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int calc_str_to_date_expr_time(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
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{
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int ret = OB_SUCCESS;
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bool is_null = false;
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int64_t datetime_int = 0;
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int64_t time_int = 0;
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if (OB_FAIL(calc(expr, ctx, is_null, datetime_int))) {
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LOG_WARN("calc str_to_date failed", K(ret), K(expr));
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} else if (is_null) {
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res_datum.set_null();
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} else if (OB_FAIL(ObTimeConverter::datetime_to_time(datetime_int, NULL, time_int))) {
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LOG_WARN("datetime_to_time failed", K(ret), K(datetime_int));
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} else {
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res_datum.set_time(time_int);
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}
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return ret;
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}
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int calc_str_to_date_expr_datetime(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
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{
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int ret = OB_SUCCESS;
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bool is_null = false;
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int64_t datetime_int = 0;
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if (OB_FAIL(calc(expr, ctx, is_null, datetime_int))) {
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LOG_WARN("calc str_to_date failed", K(ret), K(expr));
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} else if (is_null) {
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res_datum.set_null();
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} else {
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res_datum.set_datetime(datetime_int);
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}
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return ret;
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}
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int ObExprStrToDate::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, 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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UNUSED(raw_expr);
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if (ObDateType == rt_expr.datum_meta_.type_) {
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rt_expr.eval_func_ = calc_str_to_date_expr_date;
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} else if (ObTimeType == rt_expr.datum_meta_.type_) {
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rt_expr.eval_func_ = calc_str_to_date_expr_time;
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} else if (ObDateTimeType == rt_expr.datum_meta_.type_) {
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rt_expr.eval_func_ = calc_str_to_date_expr_datetime;
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} else {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected res type", K(ret), K(rt_expr.datum_meta_.type_));
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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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