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2021-05-31 22:56:52 +08:00
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src/sql/engine/expr/ob_expr_regexp.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_regexp.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 "lib/timezone/ob_timezone_info.h"
using namespace oceanbase::common;
namespace oceanbase {
namespace sql {
ObExprRegexp::ObExprRegexp(ObIAllocator& alloc)
: ObFuncExprOperator(alloc, T_OP_REGEXP, N_REGEXP, 2, NOT_ROW_DIMENSION),
regexp_idx_(OB_COMPACT_INVALID_INDEX),
pattern_is_const_(false),
value_is_const_(false)
{
need_charset_convert_ = false;
}
ObExprRegexp::~ObExprRegexp()
{}
int ObExprRegexp::assign(const ObExprOperator& other)
{
int ret = OB_SUCCESS;
const ObExprRegexp* tmp_other = dynamic_cast<const ObExprRegexp*>(&other);
if (OB_UNLIKELY(NULL == tmp_other)) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument. wrong type for other", K(ret), K(other));
} else if (OB_LIKELY(this != tmp_other)) {
if (OB_FAIL(ObFuncExprOperator::assign(other))) {
LOG_WARN("copy in Base class ObFuncExprOperator failed", K(ret));
} else {
this->regexp_idx_ = tmp_other->regexp_idx_;
this->pattern_is_const_ = tmp_other->pattern_is_const_;
this->value_is_const_ = tmp_other->value_is_const_;
}
}
return ret;
}
int ObExprRegexp::calc_result_type2(
ObExprResType& type, ObExprResType& type1, ObExprResType& type2, ObExprTypeCtx& type_ctx) const
{
UNUSED(type_ctx);
int ret = OB_SUCCESS;
if (type1.is_null() || type2.is_null()) {
type.set_int32();
type.set_precision(DEFAULT_PRECISION_FOR_BOOL);
type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
} else {
if (OB_UNLIKELY(!is_type_valid(type1.get_type()) || !is_type_valid(type2.get_type()))) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("the param is not castable", K(ret), K(type1), K(type2));
} else {
type.set_int32();
type.set_precision(DEFAULT_PRECISION_FOR_BOOL);
type.set_scale(DEFAULT_SCALE_FOR_INTEGER);
// set calc type
type1.set_calc_type(ObVarcharType);
type1.set_calc_collation_type(ObCharset::get_default_collation_oracle(CHARSET_UTF8MB4));
type2.set_calc_type(ObVarcharType);
type2.set_calc_collation_type(ObCharset::get_default_collation_oracle(CHARSET_UTF8MB4));
ObObjMeta types[2] = {type1, type2};
if (OB_FAIL(aggregate_charsets_for_comparison(type.get_calc_meta(), types, 2, type_ctx.get_coll_type()))) {
LOG_WARN("fail to aggregate charsets for comparison", K(ret), K(type1), K(type2));
} else {
ObExprOperator::calc_result_flag2(type, type1, type2);
type1.set_calc_collation(type);
type2.set_calc_collation(type);
}
}
}
return ret;
}
int ObExprRegexp::calc_result2(ObObj& result, const ObObj& text, const ObObj& pattern, ObExprCtx& expr_ctx) const
{
int ret = OB_SUCCESS;
if (OB_ISNULL(expr_ctx.calc_buf_)) {
ret = OB_ERR_UNEXPECTED;
LOG_ERROR("varchar buffer not init or exec ctx or physical plan ctx is NULL", K(expr_ctx.calc_buf_));
} else if (text.is_null() || pattern.is_null()) {
result.set_null();
} else {
if (!is_type_valid(text.get_type()) || !is_type_valid(pattern.get_type())) {
ret = OB_INVALID_ARGUMENT;
LOG_WARN("invalid argument", K(ret), K(text), K(pattern));
} else {
ObExprRegexContext posix_regexp_obj;
ObExprRegexContext* posix_regexp = NULL;
uint64_t expr_id = get_id();
TYPE_CHECK(text, ObVarcharType);
TYPE_CHECK(pattern, ObVarcharType);
ObString text_val = text.get_string();
ObString pattern_val = pattern.get_string();
bool need_fast_calculation = false;
if (OB_UNLIKELY(pattern_val.length() <= 0)) {
ret = OB_ERR_REGEXP_ERROR;
LOG_WARN("empty regex expression", K(ret));
} else if (text_val.length() == 0) {
result.set_bool(false);
} else if (OB_FAIL(need_fast_calc(expr_ctx, need_fast_calculation))) {
LOG_WARN("failed to need fast calc", K(ret));
} else {
if (need_fast_calculation) {
// no need to test expr_ctx.exec_ctx_ is null or not again. PLEASE !!! PLEASE !!!
if (NULL == (posix_regexp = static_cast<ObExprRegexContext*>(expr_ctx.exec_ctx_->get_expr_op_ctx(expr_id)))) {
if (OB_FAIL(expr_ctx.exec_ctx_->create_expr_op_ctx(expr_id, posix_regexp))) {
LOG_WARN("failed to create operator ctx", K(ret), K(expr_id));
}
}
} else {
posix_regexp = &posix_regexp_obj;
}
if (OB_FAIL(ret)) {
} else {
if (OB_ISNULL(posix_regexp)) {
ret = OB_ERR_UNEXPECTED;
LOG_ERROR("posix regexp ptr is NULL", K(ret));
} else {
const bool reusable = need_fast_calculation;
int regex_lib_flags = (ObCharset::is_bin_sort(result_type_.get_calc_collation_type()))
? OB_REG_EXTENDED | OB_REG_NOSUB
: OB_REG_EXTENDED | OB_REG_NOSUB | OB_REG_ICASE;
if (OB_FAIL(posix_regexp->init(pattern_val,
regex_lib_flags,
reusable ? expr_ctx.exec_ctx_->get_allocator() : *expr_ctx.calc_buf_,
reusable))) {
LOG_WARN("failed to initialize", K(pattern_val), K(ret));
}
}
if (OB_FAIL(ret)) {
} else {
bool is_match = false;
if (OB_FAIL(posix_regexp->match(text_val, 0, is_match, *expr_ctx.calc_buf_))) {
LOG_WARN("match error", K(ret));
} else {
result.set_bool(is_match);
}
}
}
}
}
}
return ret;
}
int ObExprRegexp::need_fast_calc(ObExprCtx& expr_ctx, bool& result) const
{
int ret = OB_SUCCESS;
result = false;
if (OB_ISNULL(expr_ctx.exec_ctx_)) {
if (OB_UNLIKELY(false == expr_ctx.is_pre_calculation_)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("unexpected error. exec ctx should not be null in pre calculation",
K(expr_ctx.exec_ctx_),
K(expr_ctx.is_pre_calculation_));
}
} else {
result = (true == pattern_is_const_ && false == value_is_const_ && get_id() != OB_INVALID_ID);
}
return ret;
}
OB_SERIALIZE_MEMBER((ObExprRegexp, ObFuncExprOperator), regexp_idx_, pattern_is_const_, value_is_const_);
int ObExprRegexp::cg_expr(ObExprCGCtx&, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
{
int ret = OB_SUCCESS;
const ObRawExpr* text = raw_expr.get_param_expr(0);
const ObRawExpr* pattern = raw_expr.get_param_expr(1);
CK(lib::is_mysql_mode()); // regexp is mysql only expr
CK(2 == rt_expr.arg_cnt_);
CK(NULL != text);
CK(NULL != pattern);
if (OB_SUCC(ret)) {
const bool const_text = text->has_flag(IS_CONST) || text->has_flag(IS_CONST_EXPR);
const bool const_pattern = pattern->has_flag(IS_CONST) || pattern->has_flag(IS_CONST_EXPR);
rt_expr.extra_ = (!const_text && const_pattern) ? 1 : 0;
rt_expr.eval_func_ = eval_regexp;
LOG_DEBUG("regexp expr cg", K(const_text), K(const_pattern), K(rt_expr.extra_));
}
return ret;
}
int ObExprRegexp::eval_regexp(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
{
int ret = OB_SUCCESS;
ObDatum* text = NULL;
ObDatum* pattern = NULL;
if (OB_FAIL(expr.eval_param_value(ctx, text, pattern))) {
LOG_WARN("evaluate parameters failed", K(ret));
} else if (text->is_null() || pattern->is_null()) {
expr_datum.set_null();
} else if (0 == pattern->len_) {
ret = OB_ERR_REGEXP_ERROR;
LOG_WARN("empty regex expression", K(ret));
expr_datum.set_null();
} else {
const bool reusable = (0 != expr.extra_) && ObExpr::INVALID_EXP_CTX_ID != expr.expr_ctx_id_;
ObExprRegexContext local_regex_ctx;
ObExprRegexContext* regex_ctx = &local_regex_ctx;
if (reusable) {
if (NULL == (regex_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_, regex_ctx))) {
LOG_WARN("create expr regex context failed", K(ret), K(expr));
} else if (OB_ISNULL(regex_ctx)) {
ret = OB_ERR_UNEXPECTED;
LOG_WARN("NULL context returned", K(ret));
}
}
}
if (OB_SUCC(ret)) {
ObIAllocator& tmp_alloc = ctx.get_reset_tmp_alloc();
const int64_t start_off = 0;
bool match = false;
int flags = ObCharset::is_bin_sort(expr.args_[0]->datum_meta_.cs_type_)
? OB_REG_EXTENDED | OB_REG_NOSUB
: OB_REG_EXTENDED | OB_REG_NOSUB | OB_REG_ICASE;
if (OB_FAIL(regex_ctx->init(
pattern->get_string(), flags, reusable ? ctx.exec_ctx_.get_allocator() : tmp_alloc, reusable))) {
LOG_WARN("init regex context failed", K(ret), K(pattern->get_string()));
} else if (OB_FAIL(regex_ctx->match(text->get_string(), start_off, match, tmp_alloc))) {
LOG_WARN("regex match failed", K(ret));
} else {
expr_datum.set_int32(match);
}
}
}
return ret;
}
} // namespace sql
} // namespace oceanbase