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oceanbase/src/sql/engine/expr/ob_expr_regexp_substr.cpp
obdev 2d19a9d8f5 [FEAT MERGE]4_1_sql_feature 
Co-authored-by: leslieyuchen <leslieyuchen@gmail.com>
Co-authored-by: Charles0429 <xiezhenjiang@gmail.com>
Co-authored-by: raywill <hustos@gmail.com>
2023-01-28 16:01:28 +08:00

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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_regexp_substr.h"
#include "lib/oblog/ob_log.h"
#include "share/object/ob_obj_cast.h"
#include "sql/engine/ob_exec_context.h"
#include "sql/engine/ob_physical_plan_ctx.h"
#include "sql/engine/ob_physical_plan.h"
#include "sql/engine/expr/ob_expr_util.h"
#include "sql/engine/expr/ob_expr_regexp_count.h"
using namespace oceanbase::common;
namespace oceanbase
{
namespace sql
{
//修改了之前定义的T_OP_REGEXP_SUBSTR为T_FUN_SYS_REGEXP_SUBSTR，因为之前T_OP_REGEXP_SUBSTR的注册值仅在mysql当中
ObExprRegexpSubstr::ObExprRegexpSubstr(ObIAllocator &alloc)
: ObStringExprOperator(alloc, T_FUN_SYS_REGEXP_SUBSTR, N_REGEXP_SUBSTR, MORE_THAN_ONE)
{
}
ObExprRegexpSubstr::~ObExprRegexpSubstr()
{
}
int ObExprRegexpSubstr::calc_result_typeN(ObExprResType &type,
ObExprResType *types,
int64_t param_num,
common::ObExprTypeCtx &type_ctx) const
{
UNUSED(type_ctx);
int ret = OB_SUCCESS;
ObRawExpr * raw_expr = type_ctx.get_raw_expr();
CK(NULL != type_ctx.get_raw_expr());
if (OB_FAIL(ret)) {
} else if (OB_UNLIKELY(param_num < 2 || param_num > 6)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("param number of regexp_substr at least 2 and at most 6", K(ret), K(param_num));
} else {
for (int i = 0; OB_SUCC(ret) && i < param_num; i++) {
if (!types[i].is_null() && !is_type_valid(types[i].get_type())) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("the parameter is not castable", K(ret), K(i));
}
}
if (OB_SUCC(ret)) {
//need duduce result type, then reset calc type.
if (lib::is_oracle_mode()) {
// set max length.
type.set_length(static_cast<common::ObLength>(types[0].get_length()));
auto str_params = make_const_carray(&types[0]);
OZ(aggregate_string_type_and_charset_oracle(*type_ctx.get_session(),
str_params,
type,
PREFER_VAR_LEN_CHAR));
OZ(deduce_string_param_calc_type_and_charset(*type_ctx.get_session(), type, str_params));
OX(type.set_length_semantics(type_ctx.get_session()->get_actual_nls_length_semantics()));
} else {
const common::ObLengthSemantics default_length_semantics = (OB_NOT_NULL(type_ctx.get_session())
? type_ctx.get_session()->get_actual_nls_length_semantics()
: common::LS_BYTE);
type.set_varchar();
type.set_length(types[0].get_length());
type.set_length_semantics(types[0].is_varchar_or_char() ? types[0].get_length_semantics() : default_length_semantics);
ret = aggregate_charsets_for_string_result(type, types, 1, type_ctx.get_coll_type());
}
if (OB_SUCC(ret)) {
bool is_case_sensitive = ObCharset::is_bin_sort(types[0].get_calc_collation_type());
bool need_utf8 = false;
switch (param_num) {
case 6/*subexpr*/:
types[5].set_calc_type(lib::is_oracle_mode() ? ObNumberType : ObIntType);
types[5].set_scale(lib::is_oracle_mode() ? NUMBER_SCALE_UNKNOWN_YET : DEFAULT_SCALE_FOR_INTEGER);
types[5].set_precision(lib::is_oracle_mode() ? PRECISION_UNKNOWN_YET :
ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
case 5/*match type*/:
types[4].set_calc_type(ObVarcharType);
types[4].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
types[4].set_calc_collation_level(CS_LEVEL_IMPLICIT);
case 4/*occurrence*/:
types[3].set_calc_type(lib::is_oracle_mode() ? ObNumberType : ObIntType);
types[3].set_scale(lib::is_oracle_mode() ? NUMBER_SCALE_UNKNOWN_YET : DEFAULT_SCALE_FOR_INTEGER);
types[3].set_precision(lib::is_oracle_mode() ? PRECISION_UNKNOWN_YET :
ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
case 3/*position*/:
types[2].set_calc_type(lib::is_oracle_mode() ? ObNumberType : ObIntType);
types[2].set_scale(lib::is_oracle_mode() ? NUMBER_SCALE_UNKNOWN_YET : DEFAULT_SCALE_FOR_INTEGER);
types[2].set_precision(lib::is_oracle_mode() ? PRECISION_UNKNOWN_YET :
ObAccuracy::DDL_DEFAULT_ACCURACY[ObIntType].precision_);
type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_STRING_INTEGER_TRUNC);
case 2/*text and pattern*/:
types[1].set_calc_type(ObVarcharType);
types[1].set_calc_collation_level(CS_LEVEL_IMPLICIT);
if (!types[0].is_clob()) {
types[0].set_calc_type(ObVarcharType);
}
types[0].set_calc_collation_level(CS_LEVEL_IMPLICIT);
need_utf8 = false;
if (OB_FAIL(ret)) {
} else if (OB_FAIL(ObExprRegexContext::check_need_utf8(raw_expr->get_param_expr(1), need_utf8))) {
LOG_WARN("fail to check need utf8", K(ret));
} else if (need_utf8) {
types[1].set_calc_collation_type(is_case_sensitive ? CS_TYPE_UTF8MB4_BIN : CS_TYPE_UTF8MB4_GENERAL_CI);
} else {
types[1].set_calc_collation_type(is_case_sensitive ? CS_TYPE_UTF16_BIN : CS_TYPE_UTF16_GENERAL_CI);
}
need_utf8 = false;
if (OB_FAIL(ret)) {
} else if (OB_FAIL(ObExprRegexContext::check_need_utf8(raw_expr->get_param_expr(0), need_utf8))) {
LOG_WARN("fail to check need utf8", K(ret));
} else if (need_utf8) {
types[0].set_calc_collation_type(is_case_sensitive ? CS_TYPE_UTF8MB4_BIN : CS_TYPE_UTF8MB4_GENERAL_CI);
} else {
types[0].set_calc_collation_type(is_case_sensitive ? CS_TYPE_UTF16_BIN : CS_TYPE_UTF16_GENERAL_CI);
}
default:
// already check before
break;
}
}
}
}
return ret;
}
int ObExprRegexpSubstr::cg_expr(ObExprCGCtx &op_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const
{
int ret = OB_SUCCESS;
UNUSED(op_cg_ctx);
CK(2 <= rt_expr.arg_cnt_ && rt_expr.arg_cnt_ <= 6);
CK(raw_expr.get_param_count() >= 2);
if (OB_SUCC(ret)) {
const ObRawExpr *text = raw_expr.get_param_expr(0);
const ObRawExpr *pattern = raw_expr.get_param_expr(1);
if (OB_ISNULL(text) || OB_ISNULL(pattern)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected null", K(text), K(pattern), K(ret));
} else {
const bool const_text = text->is_const_expr();
const bool const_pattern = pattern->is_const_expr();
rt_expr.extra_ = (!const_text && const_pattern) ? 1 : 0;
rt_expr.eval_func_ = &eval_regexp_substr;
LOG_DEBUG("regexp expr cg", K(const_text), K(const_pattern), K(rt_expr.extra_));
}
}
return ret;
}
int ObExprRegexpSubstr::eval_regexp_substr(
const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
{
int ret = OB_SUCCESS;
ObDatum *text = NULL;
ObDatum *pattern = NULL;
ObDatum *position = NULL;
ObDatum *occurrence = NULL;
ObDatum *match_type = NULL;
ObDatum *subexpr= NULL;
int64_t pos = 1;
int64_t occur = 1;
int64_t subexpr_val = 0;
if (OB_FAIL(expr.eval_param_value(ctx, text, pattern, position, occurrence, match_type, subexpr))) {
LOG_WARN("evaluate parameters failed", K(ret));
} else if (OB_UNLIKELY(expr.arg_cnt_ < 2 ||
(expr.args_[0]->datum_meta_.cs_type_ != CS_TYPE_UTF8MB4_GENERAL_CI &&
expr.args_[0]->datum_meta_.cs_type_ != CS_TYPE_UTF8MB4_BIN &&
expr.args_[0]->datum_meta_.cs_type_ != CS_TYPE_UTF16_GENERAL_CI &&
expr.args_[0]->datum_meta_.cs_type_ != CS_TYPE_UTF16_BIN) ||
(expr.args_[1]->datum_meta_.cs_type_ != CS_TYPE_UTF8MB4_GENERAL_CI &&
expr.args_[1]->datum_meta_.cs_type_ != CS_TYPE_UTF8MB4_BIN &&
expr.args_[1]->datum_meta_.cs_type_ != CS_TYPE_UTF16_GENERAL_CI &&
expr.args_[1]->datum_meta_.cs_type_ != CS_TYPE_UTF16_BIN))) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("get unexpected error", K(ret), K(expr));
} else if (lib::is_mysql_mode() && !pattern->is_null() && pattern->get_string().empty()) {
if (NULL == match_type || !match_type->is_null()) {
ret = OB_ERR_REGEXP_ERROR;
LOG_WARN("empty regex expression", K(ret));
} else {
expr_datum.set_null();
}
} else {
bool null_result = (position != NULL && position->is_null()) ||
(occurrence != NULL && occurrence->is_null()) ||
(subexpr != NULL && subexpr->is_null()) ||
(lib::is_mysql_mode() && match_type != NULL && match_type->is_null());
if (OB_FAIL(ObExprUtil::get_int_param_val(position, pos))
|| OB_FAIL(ObExprUtil::get_int_param_val(occurrence, occur))
|| OB_FAIL(ObExprUtil::get_int_param_val(subexpr, subexpr_val))) {
LOG_WARN("get integer parameter value failed", K(ret));
} else if (!null_result && (pos <= 0 || occur <= 0 || subexpr_val < 0)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("regexp_substr position or occurrence or subexpr is invalid",
K(ret), K(pos), K(occur), K(subexpr_val));
LOG_USER_ERROR(OB_INVALID_ARGUMENT, "use position or occurrence or subexpr in regexp_substr");
} else {
ObString match_param = (NULL != match_type && !match_type->is_null()) ? match_type->get_string() : ObString();
ObEvalCtx::TempAllocGuard alloc_guard(ctx);
ObIAllocator &tmp_alloc = alloc_guard.get_allocator();
ObExprRegexContext local_regex_ctx;
ObExprRegexContext *regexp_ctx = &local_regex_ctx;
const bool reusable = (0 != expr.extra_) && ObExpr::INVALID_EXP_CTX_ID != expr.expr_ctx_id_;
bool is_case_sensitive = ObCharset::is_bin_sort(expr.args_[0]->datum_meta_.cs_type_);
ObString res_substr;
ObString text_utf16;
ObCollationType res_coll_type = CS_TYPE_INVALID;
bool is_null = true;
uint32_t flags = 0;
if (reusable) {
if (NULL == (regexp_ctx = static_cast<ObExprRegexContext *>(
ctx.exec_ctx_.get_expr_op_ctx(expr.expr_ctx_id_)))) {
if (OB_FAIL(ctx.exec_ctx_.create_expr_op_ctx(expr.expr_ctx_id_, regexp_ctx))) {
LOG_WARN("create expr regex context failed", K(ret), K(expr));
} else if (OB_ISNULL(regexp_ctx)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("NULL context returned", K(ret));
}
}
}
if (OB_FAIL(ret)) {
} else if (OB_FAIL(ObExprRegexContext::get_regexp_flags(match_param, is_case_sensitive, flags))) {
LOG_WARN("fail to get regexp flags", K(ret), K(match_param));
} else if (!pattern->is_null() && !null_result &&
OB_FAIL(regexp_ctx->init(reusable ? ctx.exec_ctx_.get_allocator() : tmp_alloc,
ctx.exec_ctx_.get_my_session(),
pattern->get_string(), flags, reusable,
expr.args_[1]->datum_meta_.cs_type_))) {
LOG_WARN("fail to init regexp", K(pattern), K(flags), K(ret));
} else if (text->is_null() || pattern->is_null() || null_result ||
(NULL != position && position->is_null()) ||
(NULL != occurrence && occurrence->is_null()) ||
(NULL != subexpr && subexpr->is_null()) ||
(lib::is_mysql_mode() && NULL != match_type && match_type->is_null())) {
expr_datum.set_null();
} else {
is_null = false;
if (expr.args_[0]->datum_meta_.cs_type_ == CS_TYPE_UTF8MB4_BIN ||
expr.args_[0]->datum_meta_.cs_type_ == CS_TYPE_UTF8MB4_GENERAL_CI) {
res_coll_type = ObCharset::is_bin_sort(expr.args_[0]->datum_meta_.cs_type_) ? CS_TYPE_UTF16_BIN : CS_TYPE_UTF16_GENERAL_CI;
if (OB_FAIL(ObExprUtil::convert_string_collation(text->get_string(), expr.args_[0]->datum_meta_.cs_type_, text_utf16,
res_coll_type, tmp_alloc))) {
LOG_WARN("convert charset failed", K(ret));
}
} else {
res_coll_type = expr.args_[0]->datum_meta_.cs_type_;
text_utf16 = text->get_string();
}
}
if (OB_FAIL(ret) || is_null) {
} else if (OB_FAIL(regexp_ctx->substr(tmp_alloc, text_utf16, pos - 1,
occur, subexpr_val, res_substr))) {
LOG_WARN("failed to regexp substr", K(ret));
} else if (res_substr.empty() && lib::is_oracle_mode() && expr.args_[0]->datum_meta_.is_clob()) {
expr_datum.set_string(ObString().ptr(), ObString().length());
} else if (res_substr.empty()) {
expr_datum.set_null();
} else {
ObExprStrResAlloc out_alloc(expr, ctx);
ObString out;
if (OB_FAIL(ObExprUtil::convert_string_collation(res_substr, res_coll_type,
out, expr.datum_meta_.cs_type_, out_alloc))) {
LOG_WARN("convert charset failed", K(ret));
} else if (out.ptr() == res_substr.ptr()) {
// res_substr is allocated in temporary allocator, deep copy here.
char *mem = expr.get_str_res_mem(ctx, res_substr.length());
if (OB_ISNULL(mem)) {
ret = OB_ALLOCATE_MEMORY_FAILED;
LOG_WARN("allocate memory failed", K(ret));
} else {
MEMCPY(mem, res_substr.ptr(), res_substr.length());
expr_datum.set_string(mem, res_substr.length());
}
} else {
expr_datum.set_string(out.ptr(), out.length());
}
}
}
}
return ret;
}
}
}
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