242 lines
10 KiB
C++
242 lines
10 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_regexp_count.h"
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#include "lib/oblog/ob_log.h"
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#include "lib/number/ob_number_v2.h"
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#include "share/object/ob_obj_cast.h"
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#include "sql/engine/expr/ob_expr_util.h"
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#include "sql/engine/ob_exec_context.h"
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#include "sql/engine/ob_physical_plan_ctx.h"
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#include "sql/engine/ob_physical_plan.h"
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#include "sql/engine/expr/ob_expr_lob_utils.h"
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using namespace oceanbase::common;
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namespace oceanbase
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{
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namespace sql
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{
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ObExprRegexpCount::ObExprRegexpCount(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_REGEXP_COUNT, N_REGEXP_COUNT, MORE_THAN_ONE, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprRegexpCount::~ObExprRegexpCount()
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{
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}
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int ObExprRegexpCount::calc_result_typeN(ObExprResType &type,
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ObExprResType *types,
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int64_t param_num,
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common::ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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ObRawExpr * raw_expr = type_ctx.get_raw_expr();
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CK(NULL != type_ctx.get_raw_expr());
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if (OB_FAIL(ret)) {
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} else if (OB_UNLIKELY(param_num < 2 || param_num > 4)) {
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ret = OB_ERR_PARAM_SIZE;
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LOG_WARN("param number of regexp_count at least 2 and at most 4", K(ret), K(param_num));
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} else {
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for (int i = 0; OB_SUCC(ret) && i < param_num; i++) {
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if (!types[i].is_null() && !is_type_valid(types[i].get_type())) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("the parameter is not castable", K(ret), K(i));
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}
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}
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if (OB_SUCC(ret)) {
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bool is_case_sensitive = ObCharset::is_bin_sort(types[0].get_calc_collation_type());
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bool need_utf8 = false;
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switch (param_num) {
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case 4/*match type*/:
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types[3].set_calc_type(ObVarcharType);
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types[3].set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
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types[3].set_calc_collation_level(CS_LEVEL_IMPLICIT);
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case 3/*postition*/:
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types[2].set_calc_type(ObNumberType);
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types[2].set_scale(NUMBER_SCALE_UNKNOWN_YET);
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types[2].set_precision(PRECISION_UNKNOWN_YET);
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case 2/*pattern and text*/:
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//why we set the calc collation type is utf16, because the ICU regexp engine is used uft16,
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//we need convert it the need collation in advance, and no need to think about in regexp.
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//lob TODO,jiangxiu.wt
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types[1].set_calc_type(ObVarcharType);
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types[1].set_calc_collation_level(CS_LEVEL_IMPLICIT);
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if (!types[0].is_clob()) {
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types[0].set_calc_type(ObVarcharType);
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}
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types[0].set_calc_collation_level(CS_LEVEL_IMPLICIT);
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need_utf8 = false;
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if (OB_FAIL(ObExprRegexContext::check_need_utf8(raw_expr->get_param_expr(1), need_utf8))) {
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LOG_WARN("fail to check need utf8", K(ret));
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} else if (need_utf8) {
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types[1].set_calc_collation_type(is_case_sensitive ? CS_TYPE_UTF8MB4_BIN : CS_TYPE_UTF8MB4_GENERAL_CI);
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} else {
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types[1].set_calc_collation_type(is_case_sensitive ? CS_TYPE_UTF16_BIN : CS_TYPE_UTF16_GENERAL_CI);
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}
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need_utf8 = false;
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if (OB_FAIL(ret)) {
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} else if (OB_FAIL(ObExprRegexContext::check_need_utf8(raw_expr->get_param_expr(0), need_utf8))) {
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LOG_WARN("fail to check need utf8", K(ret));
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} else if (need_utf8) {
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types[0].set_calc_collation_type(is_case_sensitive ? CS_TYPE_UTF8MB4_BIN : CS_TYPE_UTF8MB4_GENERAL_CI);
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} else {
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types[0].set_calc_collation_type(is_case_sensitive ? CS_TYPE_UTF16_BIN : CS_TYPE_UTF16_GENERAL_CI);
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}
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default:
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// already check before
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break;
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}
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type.set_number();
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type.set_scale(NUMBER_SCALE_UNKNOWN_YET);
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type.set_precision(PRECISION_UNKNOWN_YET);
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}
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}
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return ret;
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}
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int ObExprRegexpCount::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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// regex_count is oracle only expr
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UNUSED(op_cg_ctx);
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CK(lib::is_oracle_mode());
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CK(2 <= rt_expr.arg_cnt_ && rt_expr.arg_cnt_ <= 4);
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CK(raw_expr.get_param_count() >= 2);
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if (OB_SUCC(ret)) {
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const ObRawExpr *text = raw_expr.get_param_expr(0);
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const ObRawExpr *pattern = raw_expr.get_param_expr(1);
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if (OB_ISNULL(text) || OB_ISNULL(pattern)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get unexpected null", K(text), K(pattern), K(ret));
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} else {
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const bool const_text = text->is_const_expr();
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const bool const_pattern = pattern->is_const_expr();
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rt_expr.extra_ = (!const_text && const_pattern) ? 1 : 0;
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rt_expr.eval_func_ = &eval_regexp_count;
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LOG_TRACE("regexp count expr cg", K(const_text), K(const_pattern), K(rt_expr.extra_));
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}
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}
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return ret;
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}
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int ObExprRegexpCount::eval_regexp_count(
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const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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ObDatum *text = NULL;
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ObDatum *pattern = NULL;
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ObDatum *position = NULL;
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ObDatum *match_type = NULL;
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if (OB_FAIL(expr.eval_param_value(ctx, text, pattern, position, match_type))) {
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LOG_WARN("evaluate parameters failed", K(ret));
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} else if (OB_UNLIKELY(expr.arg_cnt_ < 2 ||
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(expr.args_[0]->datum_meta_.cs_type_ != CS_TYPE_UTF8MB4_GENERAL_CI &&
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expr.args_[0]->datum_meta_.cs_type_ != CS_TYPE_UTF8MB4_BIN &&
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expr.args_[0]->datum_meta_.cs_type_ != CS_TYPE_UTF16_GENERAL_CI &&
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expr.args_[0]->datum_meta_.cs_type_ != CS_TYPE_UTF16_BIN) ||
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(expr.args_[1]->datum_meta_.cs_type_ != CS_TYPE_UTF8MB4_GENERAL_CI &&
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expr.args_[1]->datum_meta_.cs_type_ != CS_TYPE_UTF8MB4_BIN &&
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expr.args_[1]->datum_meta_.cs_type_ != CS_TYPE_UTF16_GENERAL_CI &&
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expr.args_[1]->datum_meta_.cs_type_ != CS_TYPE_UTF16_BIN))) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("get unexpected error", K(ret), K(expr));
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} else {
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int64_t pos = 1;
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if (position != NULL && position->is_null()) {
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expr_datum.set_null();
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} else if (OB_FAIL(ObExprUtil::get_int_param_val(position, pos))) {
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LOG_WARN("truncate number to int64 failed", K(ret));
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} else if (pos <= 0) {
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ret = OB_ERR_ARGUMENT_OUT_OF_RANGE;
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LOG_WARN("position out of range", K(ret), K(position), K(pos));
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} else {
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ObString match_param = (NULL != match_type && !match_type->is_null()) ? match_type->get_string() : ObString();
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ObEvalCtx::TempAllocGuard alloc_guard(ctx);
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ObIAllocator &tmp_alloc = alloc_guard.get_allocator();
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int64_t res_count = 0;
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ObExprRegexContext local_regex_ctx;
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ObExprRegexContext *regexp_ctx = &local_regex_ctx;
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const bool reusable = (0 != expr.extra_) && ObExpr::INVALID_EXP_CTX_ID != expr.expr_ctx_id_;
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bool is_case_sensitive = ObCharset::is_bin_sort(expr.args_[0]->datum_meta_.cs_type_);
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uint32_t flags = 0;
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ObString text_utf16;
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ObString text_str;
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bool is_null = true;
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if (reusable) {
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if (NULL == (regexp_ctx = static_cast<ObExprRegexContext *>(
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ctx.exec_ctx_.get_expr_op_ctx(expr.expr_ctx_id_)))) {
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if (OB_FAIL(ctx.exec_ctx_.create_expr_op_ctx(expr.expr_ctx_id_, regexp_ctx))) {
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LOG_WARN("create expr regex context failed", K(ret), K(expr));
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} else if (OB_ISNULL(regexp_ctx)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("NULL context returned", K(ret));
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}
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}
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}
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if (OB_FAIL(ret)) {
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} else if (OB_FAIL(ObExprRegexContext::get_regexp_flags(match_param, is_case_sensitive, flags))) {
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LOG_WARN("fail to get regexp flags", K(ret), K(match_param));
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} else if (!pattern->is_null() &&
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OB_FAIL(regexp_ctx->init(reusable ? ctx.exec_ctx_.get_allocator() : tmp_alloc,
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ctx.exec_ctx_.get_my_session(),
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pattern->get_string(), flags, reusable, expr.args_[1]->datum_meta_.cs_type_))) {
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LOG_WARN("fail to init regexp", K(pattern), K(flags), K(ret));
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} else if (ob_is_text_tc(expr.args_[0]->datum_meta_.type_)) {
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if (OB_FAIL(ObTextStringHelper::get_string(expr, tmp_alloc, 0, text, text_str))) {
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LOG_WARN("get text string failed", K(ret));
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}
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} else {
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text_str = text->get_string();
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}
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if (OB_FAIL(ret)) {
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} else if (text->is_null() || pattern->is_null() ||
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(position != NULL && position->is_null())) {
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expr_datum.set_null();
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} else {
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is_null = false;
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if (expr.args_[0]->datum_meta_.cs_type_ == CS_TYPE_UTF8MB4_BIN ||
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expr.args_[0]->datum_meta_.cs_type_ == CS_TYPE_UTF8MB4_GENERAL_CI) {
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if (OB_FAIL(ObExprUtil::convert_string_collation(text_str, expr.args_[0]->datum_meta_.cs_type_, text_utf16,
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ObCharset::is_bin_sort(expr.args_[0]->datum_meta_.cs_type_) ? CS_TYPE_UTF16_BIN : CS_TYPE_UTF16_GENERAL_CI,
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tmp_alloc))) {
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LOG_WARN("convert charset failed", K(ret));
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}
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} else {
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text_utf16 = text_str;
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}
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}
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if (OB_FAIL(ret) || is_null) {
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} else if (OB_FAIL(regexp_ctx->count(tmp_alloc, text_utf16, pos - 1, res_count))) {
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LOG_WARN("failed to regexp count", K(ret));
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} else {
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number::ObNumber nmb;
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ObNumStackOnceAlloc nmb_alloc;
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if (OB_FAIL(nmb.from(res_count, nmb_alloc))) {
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LOG_WARN("set integer to number failed", K(ret));
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} else {
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expr_datum.set_number(nmb);
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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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}
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}
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