314 lines
11 KiB
C++
314 lines
11 KiB
C++
/**
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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_case.h"
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#include "sql/engine/expr/ob_expr_operator.h"
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//#include "sql/engine/expr/ob_expr_promotion_util.h"
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#include "sql/session/ob_sql_session_info.h"
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namespace oceanbase {
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using namespace common;
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namespace sql {
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typedef int (*CheckIsMatchFunc)(const ObDatum* when_datum, bool& match_when);
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ObExprCase::ObExprCase(ObIAllocator& alloc) : ObExprOperator(alloc, T_OP_CASE, N_CASE, MORE_THAN_ONE, NOT_ROW_DIMENSION)
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{
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disable_operand_auto_cast();
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param_lazy_eval_ = true;
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}
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ObExprCase::~ObExprCase()
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{}
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// param_num include then/else expr, exclude when expr.
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int ObExprCase::calc_result_typeN(
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ObExprResType& type, ObExprResType* types_stack, int64_t param_num, ObExprTypeCtx& type_ctx) const
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{
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// case
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// when 10 then expr1
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// when 11 then expr2
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// [else expr3]
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int ret = OB_SUCCESS;
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if (OB_ISNULL(types_stack)) {
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LOG_WARN("null types");
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ret = OB_INVALID_ARGUMENT;
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} else if (OB_UNLIKELY(param_num < 3 || param_num % 2 == 0)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("param num is not correct", K(param_num));
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} else { // param_num >=3 and param_num is odd
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/* in order to be compatible with mysql
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* both in ob_expr_case.cpp and ob_expr_arg_case.cpp
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* types_stack includes the condition exprs.
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* In expr_case, there is no arg param expr compared with expr_arg_case
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*/
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const int64_t cond_type_count = param_num / 2;
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const int64_t val_type_count = param_num - cond_type_count;
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const ObLengthSemantics default_length_semantics =
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(OB_NOT_NULL(type_ctx.get_session()) ? type_ctx.get_session()->get_actual_nls_length_semantics() : LS_BYTE);
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if (OB_FAIL(aggregate_result_type_for_case(type,
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types_stack + cond_type_count,
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val_type_count,
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type_ctx.get_coll_type(),
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lib::is_oracle_mode(),
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default_length_semantics,
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type_ctx.get_session()))) {
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LOG_WARN("failed to aggregate result type");
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} else {
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ObExprOperator::calc_result_flagN(type, types_stack + cond_type_count, val_type_count);
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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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for (int64_t i = 0; i < cond_type_count; ++i) {
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const ObObjType cond_type = types_stack[i].get_type();
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const ObObjTypeClass cond_tc = ob_obj_type_class(cond_type);
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if (ObIntTC == cond_tc || ObUIntTC == cond_tc || ObNumberTC == cond_tc || ObNullTC == cond_tc) {
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types_stack[i].set_calc_type(cond_type);
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types_stack[i].set_calc_collation(types_stack[i]);
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} else {
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types_stack[i].set_calc_type(ObDoubleType);
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types_stack[i].set_calc_collation_type(CS_TYPE_BINARY);
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types_stack[i].set_calc_collation_level(CS_LEVEL_NUMERIC);
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}
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}
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bool is_expr_integer_type = (ob_is_int_tc(type.get_type()) || ob_is_uint_tc(type.get_type()));
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for (int64_t i = cond_type_count; OB_SUCC(ret) && i < param_num; ++i) {
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bool is_arg_integer_type =
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(ob_is_int_tc(types_stack[i].get_type()) || ob_is_uint_tc(types_stack[i].get_type()));
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if ((is_arg_integer_type && is_expr_integer_type) || ObNullType == types_stack[i].get_type()) {
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// see ObExprCoalesce::calc_result_typeN
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types_stack[i].set_calc_meta(types_stack[i].get_obj_meta());
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} else {
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types_stack[i].set_calc_meta(type.get_obj_meta());
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if (ob_is_json(types_stack[i].get_type())) {
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types_stack[i].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
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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 ObExprCase::calc_resultN(ObObj& result, const ObObj* objs_stack, int64_t param_num, ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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if (OB_ISNULL(expr_ctx.calc_buf_)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("expr_ctx.calc_buf is null", K(expr_ctx.calc_buf_));
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} else {
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ret = calc(result, objs_stack, param_num, result_type_, expr_ctx);
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}
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return ret;
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}
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// Case expr support parameter lazy evaluation, param_eval() must called
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// before access object in %objs_stack,
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int ObExprCase::calc(ObObj& result, const ObObj* objs_stack, int64_t param_num, const ObExprResType& expected_type,
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ObExprCtx& expr_ctx) const
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{
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int ret = OB_SUCCESS;
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bool match_when = false;
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ObObj tmp_result;
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int64_t i = 0;
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if (OB_ISNULL(objs_stack)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("null stack", K(objs_stack));
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} else if (OB_UNLIKELY(param_num < 2)) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("no enough param", K(param_num));
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} else {
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const bool has_else = (param_num % 2 != 0);
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int64_t loop = (has_else) ? param_num - 1 : param_num;
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double double_v = 0;
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bool bool_v = false;
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EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
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for (i = 0; OB_SUCC(ret) && !match_when && i < loop; i += 2) {
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if (OB_FAIL(param_eval(expr_ctx, objs_stack[i], i))) {
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LOG_WARN("parameter evaluate failed", K(ret), K(i));
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} else {
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ObObjType type = objs_stack[i].get_type();
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if (ObNullType != type) {
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if (ob_is_int_tc(type)) {
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bool_v = (objs_stack[i].get_int() != 0);
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} else if (ob_is_uint_tc(type) || ob_is_enumset_tc(type)) {
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bool_v = (objs_stack[i].get_uint64() != 0);
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} else if (ob_is_number_tc(type)) {
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bool_v = !(objs_stack[i].get_number().is_zero());
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} else {
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EXPR_GET_DOUBLE_V2(objs_stack[i], double_v);
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if (OB_FAIL(ret)) {
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LOG_WARN("fail cast obj to tinyint", K(objs_stack[i]), K(ret));
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} else {
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bool_v = (double_v >= DOUBLE_TRUE_VALUE_THRESHOLD || double_v <= -DOUBLE_TRUE_VALUE_THRESHOLD);
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}
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}
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if (bool_v) { // no need to test ret here
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if (OB_FAIL(param_eval(expr_ctx, objs_stack[i + 1], i + 1))) {
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LOG_WARN("parameter evaluate failed", K(ret), K(i + 1));
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} else {
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tmp_result = objs_stack[i + 1];
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match_when = true;
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LOG_DEBUG("match", K(tmp_result));
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}
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}
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}
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}
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} // end for
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if (OB_SUCC(ret)) {
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if (!match_when) {
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if (has_else) {
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if (OB_FAIL(param_eval(expr_ctx, objs_stack[param_num - 1], param_num - 1))) {
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LOG_WARN("parameter evaluate failed", K(ret), K(param_num - 1));
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} else {
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tmp_result = objs_stack[param_num - 1]; // match else
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}
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} else {
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tmp_result.set_null();
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}
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}
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if (OB_SUCC(ret)) {
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if (tmp_result.is_null()) {
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result.set_null();
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} else {
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if (ob_is_string_or_lob_type(result_type_.get_type())) {
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cast_ctx.dest_collation_ = result_type_.get_collation_type();
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}
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if (OB_FAIL(ObObjCaster::to_type(expected_type.get_type(), cast_ctx, tmp_result, result))) {
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LOG_WARN("fail cast obj", K(expected_type.get_type()), K(tmp_result), K(ret));
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}
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}
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}
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} // end set result
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}
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return ret;
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}
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int ObExprCase::cg_expr(ObExprCGCtx& op_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(op_cg_ctx);
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const ObCaseOpRawExpr& case_expr = dynamic_cast<const ObCaseOpRawExpr&>(raw_expr);
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// when expr must return int/null because it must be bool expr.
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for (int64_t i = 0; OB_SUCC(ret) && i < case_expr.get_when_expr_size(); ++i) {
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const ObRawExpr* when_expr = case_expr.get_when_param_expr(i);
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const ObObjType& when_expr_res_type = when_expr->get_result_type().get_type();
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if (OB_UNLIKELY(ObNullType != when_expr_res_type && !ob_is_integer_type(when_expr_res_type))) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("when expr must return integer", K(ret), K(when_expr_res_type));
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}
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}
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if (OB_SUCC(ret)) {
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rt_expr.eval_func_ = calc_case_expr;
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}
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return ret;
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}
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static int check_is_match(const ObDatum& when_datum, bool& match_when)
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{
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int ret = OB_SUCCESS;
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if (when_datum.is_null()) {
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match_when = false;
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} else {
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int64_t v = when_datum.get_int();
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match_when = (v != 0) ? true : false;
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}
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return ret;
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}
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int ObExprCase::calc_case_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
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{
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int ret = OB_SUCCESS;
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const bool has_else = (expr.arg_cnt_ % 2 != 0);
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int64_t loop = (has_else) ? expr.arg_cnt_ - 1 : expr.arg_cnt_;
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bool match_when = false;
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ObDatum* when_datum = NULL;
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ObDatum* then_datum = NULL;
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bool has_result = false;
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int64_t expr_idx = 0;
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for (; OB_SUCC(ret) && !match_when && expr_idx < loop; expr_idx += 2) {
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if (OB_FAIL(expr.args_[expr_idx]->eval(ctx, when_datum))) {
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LOG_WARN("eval when expr failed", K(ret), K(expr_idx));
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} else if (OB_FAIL(check_is_match(*when_datum, match_when))) {
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LOG_WARN("check is when expr match failed", K(ret), K(expr_idx));
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} else if (match_when) {
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if (OB_FAIL(expr.args_[expr_idx + 1]->eval(ctx, then_datum))) {
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LOG_WARN("eval then expr failed", K(ret), K(expr_idx + 1));
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} else {
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has_result = true;
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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 (!match_when) {
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if (has_else) {
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if (OB_FAIL(expr.args_[expr.arg_cnt_ - 1]->eval(ctx, then_datum))) {
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LOG_WARN("eval else expr failed for case when", K(ret));
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} else {
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has_result = true;
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}
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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 (!has_result) {
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res_datum.set_null();
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} else {
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if (OB_ISNULL(then_datum)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("then_datum is NULL", K(ret));
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} else {
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res_datum.set_datum(*then_datum);
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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 ObExprCase::is_same_kind_type_for_case(const ObIArray<ObExprResType>& type_arr)
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{
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int ret = OB_SUCCESS;
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if (OB_SUCC(ret)) {
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bool match = false;
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int64_t first_not_null_idx = OB_INVALID_ID;
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for (int64_t i = 0; OB_SUCC(ret) && OB_INVALID_ID == first_not_null_idx && i < type_arr.count(); ++i) {
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if (!ob_is_null(type_arr.at(i).get_type())) {
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first_not_null_idx = i;
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}
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}
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first_not_null_idx = OB_INVALID_ID == first_not_null_idx ? 0 : first_not_null_idx;
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const ObExprResType& res_type = type_arr.at(first_not_null_idx);
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for (int64_t i = first_not_null_idx + 1; OB_SUCC(ret) && i < type_arr.count(); ++i) {
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if (OB_FAIL(ObExprOperator::is_same_kind_type_for_case(res_type, type_arr.at(i), match))) {
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LOG_WARN("fail to judge same type", K(i), K(res_type), K(type_arr.at(i)), K(ret));
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} else if (!match) {
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ret = OB_ERR_INVALID_TYPE_FOR_OP;
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LOG_WARN("fail to judge same type", K(i), K(res_type), K(type_arr.at(i)), K(ret));
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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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} // namespace sql
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} // namespace oceanbase
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