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oceanbase/src/sql/engine/expr/ob_expr_regexp_like.cpp

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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_like.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"
#include "sql/engine/expr/ob_expr_lob_utils.h"
using namespace oceanbase::common;
namespace oceanbase
{
namespace sql
{
ObExprRegexpLike::ObExprRegexpLike(ObIAllocator &alloc)
: ObFuncExprOperator(alloc, T_FUN_SYS_REGEXP_LIKE, N_REGEXP_LIKE, MORE_THAN_ONE, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
{
}
ObExprRegexpLike::~ObExprRegexpLike()
{
}
int ObExprRegexpLike::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 > 3)) {
ret = OB_ERR_PARAM_SIZE;
LOG_WARN("param number of regexp_replace at least 2 and at most 3", K(ret), K(param_num));
} else {
bool is_case_sensitive = ObCharset::is_bin_sort(types[0].get_collation_type());
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) && is_mysql_mode()) {
ObExprResType cmp_type;
if (OB_FAIL(ObExprRegexContext::check_binary_compatible(types, 2))) {
LOG_WARN("types are not compatible with binary.", K(ret));
} else if (OB_FAIL(aggregate_charsets_for_comparison(cmp_type, types, 2, type_ctx.get_coll_type()))) {
LOG_WARN("fail to aggregate charsets for comparison");
} else {
is_case_sensitive = ObCharset::is_bin_sort(cmp_type.get_calc_collation_type());
}
}
if (OB_SUCC(ret)) {
if (param_num == 3) {/*match type*/
types[2].set_calc_type(ObVarcharType);
types[2].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
types[2].set_calc_collation_level(CS_LEVEL_IMPLICIT);
}
//we set the calc collation type to utf8 and convert it to utf16 in excution stage, because the ICU regexp engine is used uft16,
//we need convert it the need collation in advance, and no need to think about in regexp.
//lob TODO,jiangxiu.wt
bool need_utf8 = false;
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);
type.set_tinyint();
type.set_precision(DEFAULT_PRECISION_FOR_BOOL);
type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
ObExprOperator::calc_result_flag2(type, types[0], types[1]);
need_utf8 = false;
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);
}
}
}
return ret;
}
int ObExprRegexpLike::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_ || 3 == rt_expr.arg_cnt_);
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_like;
LOG_DEBUG("regexp like expr cg", K(const_text), K(const_pattern), K(rt_expr.extra_));
}
}
return ret;
}
int ObExprRegexpLike::eval_regexp_like(
const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
{
int ret = OB_SUCCESS;
ObDatum *text = NULL;
ObDatum *pattern = NULL;
ObDatum *match_type = NULL;
if (OB_FAIL(expr.eval_param_value(ctx, text, pattern, match_type))) {
if (lib::is_mysql_mode() && ret == OB_ERR_INCORRECT_STRING_VALUE) {//compatible mysql
ret = OB_SUCCESS;
expr_datum.set_null();
const char *charset_name = ObCharset::charset_name(expr.args_[0]->datum_meta_.cs_type_);
int64_t charset_name_len = strlen(charset_name);
const char *tmp_char = NULL;
LOG_USER_WARN(OB_ERR_INVALID_CHARACTER_STRING, static_cast<int>(charset_name_len), charset_name, 0, tmp_char);
} else {
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 {
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;
uint32_t flags = 0;
int64_t start_pos = 1;
bool match = false;
bool is_case_sensitive = ObCharset::is_bin_sort(expr.args_[0]->datum_meta_.cs_type_);
const bool reusable = (0 != expr.extra_) && ObExpr::INVALID_EXP_CTX_ID != expr.expr_ctx_id_;
ObString text_utf16;
ObString text_str;
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() &&
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));
//need pre check the pattern valid, and then set result.
} else if (ob_is_text_tc(expr.args_[0]->datum_meta_.type_)) {
if (OB_FAIL(ObTextStringHelper::get_string(expr, tmp_alloc, 0, text, text_str))) {
LOG_WARN("get text string failed", K(ret));
}
} else {
text_str = text->get_string();
}
if (OB_FAIL(ret)) {
} else if (text->is_null() || pattern->is_null() ||
(lib::is_mysql_mode() && NULL != match_type && match_type->is_null())) {
expr_datum.set_null();
} else {
if (expr.args_[0]->datum_meta_.cs_type_ == CS_TYPE_UTF8MB4_BIN ||
expr.args_[0]->datum_meta_.cs_type_ == CS_TYPE_UTF8MB4_GENERAL_CI) {
if (OB_FAIL(ObExprUtil::convert_string_collation(text_str, expr.args_[0]->datum_meta_.cs_type_, text_utf16,
ObCharset::is_bin_sort(expr.args_[0]->datum_meta_.cs_type_) ? CS_TYPE_UTF16_BIN : CS_TYPE_UTF16_GENERAL_CI,
tmp_alloc))) {
LOG_WARN("convert charset failed", K(ret));
}
} else {
text_utf16 = text_str;
}
if (OB_FAIL(ret)) {
} else if (OB_FAIL(regexp_ctx->match(tmp_alloc, text_utf16, start_pos - 1, match))) {
LOG_WARN("fail to match", K(ret), K(text));
} else {
expr_datum.set_int32(match);
}
}
}
return ret;
}
int ObExprRegexpLike::is_valid_for_generated_column(const ObRawExpr*expr,
const common::ObIArray<ObRawExpr *> &exprs,
bool &is_valid) const {
int ret = OB_SUCCESS;
is_valid = lib::is_mysql_mode();
return ret;
}
}
}
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