204 lines
7.9 KiB
C++
204 lines
7.9 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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* This file contains implementation for _st_asewkb expr.
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*/
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#define USING_LOG_PREFIX SQL_ENG
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#include "ob_expr_prefix_pattern.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "sql/engine/ob_exec_context.h"
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#include "sql/engine/expr/ob_expr_substr.h"
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//#include "lib/charset/ob_charset.h"
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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ObExprPrefixPattern::ObExprPrefixPattern(ObIAllocator &alloc)
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: ObStringExprOperator(alloc, T_FUN_SYS_PREFIX_PATTERN, N_PREFIX_PATTERN, 3, NOT_VALID_FOR_GENERATED_COL)
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{
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}
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int ObExprPrefixPattern::cg_expr(ObExprCGCtx &op_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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UNUSED(op_cg_ctx);
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UNUSED(raw_expr);
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int ret = OB_SUCCESS;
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if (OB_UNLIKELY(3 != rt_expr.arg_cnt_)) {
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ret = OB_ERR_PARAM_SIZE;
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LOG_WARN("invalid arg cnt of expr", K(ret), K(rt_expr));
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} else {
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rt_expr.eval_func_ = ObExprPrefixPattern::eval_prefix_pattern;
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}
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return ret;
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}
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int ObExprPrefixPattern::eval_prefix_pattern(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum) {
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int ret = OB_SUCCESS;
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ObDatum *pattern = NULL;
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ObDatum *len_param = NULL;
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ObDatum *escape = NULL;
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ObCollationType escape_coll = expr.args_[2]->datum_meta_.cs_type_;
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int64_t result_len = 0;
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int64_t prefix_len = 0;
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ObString escape_str, result_str;
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bool is_valid = true;
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if (OB_FAIL(expr.eval_param_value(ctx, pattern, len_param, escape))) {
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LOG_WARN("eval args failed", K(ret));
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} else if (OB_ISNULL(pattern) || OB_ISNULL(len_param) || OB_ISNULL(escape)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("params are unexpected null", K(ret), K(pattern), K(len_param), K(escape));
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} else if (len_param->is_null() || pattern->is_null()) {
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is_valid = false;
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LOG_WARN("the lenth or escape param is not valid", K(ret), K(len_param), K(escape));
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} else if (is_mysql_mode() && escape->is_null()) {
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escape_coll = CS_TYPE_UTF8MB4_BIN;
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escape_str = ObString::make_string("\\");
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} else {
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escape_str = escape->get_string();
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}
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if (OB_SUCC(ret)) {
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if (is_oracle_mode()) {
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const number::ObNumber len_nmb(len_param->get_number());
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if (OB_FAIL(len_nmb.extract_valid_int64_with_trunc(prefix_len))) {
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LOG_WARN("extract_valid_uint64_with_trunc failed", K(ret), K(len_nmb));
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}
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} else {
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prefix_len = len_param->get_int();
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}
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}
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bool is_result_batch_ascii = false;
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if (OB_FAIL(ret)) {
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} else if (is_valid && OB_FAIL(calc_prefix_pattern(pattern->get_string(),
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expr.args_[0]->datum_meta_.cs_type_,
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escape_str,
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escape_coll,
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prefix_len,
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result_len,
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is_valid))) {
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LOG_WARN("fail to calc prefix pattern", K(ret));
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} else if (!is_valid) {
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expr_datum.set_null();
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} else if (OB_FAIL(ObExprSubstr::substr(
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result_str, pattern->get_string(), 1, result_len,
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expr.args_[0]->datum_meta_.cs_type_,
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storage::can_do_ascii_optimize(expr.args_[0]->datum_meta_.cs_type_), false,
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is_result_batch_ascii))) {
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LOG_WARN("get substr failed", K(ret));
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} else if (OB_UNLIKELY(result_str.length() <= 0) && lib::is_oracle_mode()) {
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expr_datum.set_null();
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} else {
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expr_datum.set_string(result_str);
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}
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return ret;
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}
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int ObExprPrefixPattern::calc_prefix_pattern(const ObString &pattern,
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ObCollationType pattern_coll,
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const ObString &escape,
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ObCollationType escape_coll,
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int64_t prefix_len,
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int64_t &result_len,
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bool &is_valid) {
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int ret = OB_SUCCESS;
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int32_t escape_wc = 0;
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int32_t wildcard_wc = 0;
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const ObCharsetInfo *cs = NULL;
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bool empty_escape = escape.empty();
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if (!empty_escape && 1 != escape.length()) {
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is_valid = false;
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} else if (OB_FAIL(ObCharset::mb_wc(escape_coll, escape, escape_wc))) {
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if (ret == OB_ERR_INCORRECT_STRING_VALUE) {
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//escape param have characters that can't be transformed to unicode
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ret = OB_SUCCESS;
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is_valid = false;
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} else {
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LOG_WARN("failed to convert escape to wc", K(ret), K(escape_coll), K(escape));
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}
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} else if (OB_FAIL(ObCharset::mb_wc(CS_TYPE_UTF8MB4_BIN, ObString::make_string("%"), wildcard_wc))) {
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LOG_WARN("failed to convert '%' to wc", K(ret));
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} else if (OB_UNLIKELY(OB_ISNULL(cs = ObCharset::get_charset(pattern_coll)) || OB_ISNULL(cs->cset))) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected charset", K(ret), K(pattern_coll));
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} else {
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int64_t len_without_escape = 0;
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int64_t escape_count = 0;
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bool find_wildcard = false;
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bool find_escape = false;
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const char *buf_start = pattern.ptr();
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const char *buf_end = pattern.ptr() + pattern.length();
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int error = 0;
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is_valid = true;
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while (OB_SUCC(ret) && buf_start < buf_end && len_without_escape < prefix_len && !find_wildcard && is_valid) {
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int32_t byte_len = cs->cset->well_formed_len(cs, buf_start, buf_end, 1, &error);
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int32_t pattern_wc = 0;
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if (OB_UNLIKELY(0 != error)) {
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//pattern param have invalid character
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is_valid = false;
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} else if (OB_FAIL(ObCharset::mb_wc(pattern_coll, ObString(byte_len, buf_start), pattern_wc))) {
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if (ret == OB_ERR_INCORRECT_STRING_VALUE) {
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//pattern param have characters that can't be transformed to unicode
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ret = OB_SUCCESS;
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is_valid = false;
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} else {
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LOG_WARN("failed to convert pattern to wc", K(ret), K(pattern), K(pattern_coll));
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}
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} else if (find_escape) { //the prev character is escape
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find_escape = false;
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++ len_without_escape;
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} else if (!empty_escape && pattern_wc == escape_wc) {
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find_escape = true;
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++ escape_count;
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} else if (pattern_wc == wildcard_wc) {// find '%'
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find_wildcard = true;
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++ len_without_escape;
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} else {
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++ len_without_escape;
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}
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buf_start += byte_len;
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}
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result_len = len_without_escape + escape_count;
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}
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return ret;
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}
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int ObExprPrefixPattern::calc_result_type3(ObExprResType &type,
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ObExprResType &type1,
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ObExprResType &type2,
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ObExprResType &type3,
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ObExprTypeCtx &type_ctx) const
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{
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int ret = OB_SUCCESS;
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if ((!ob_is_string_type(type1.get_type()) && !type1.is_null())
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|| (!ob_is_string_type(type3.get_type()) && !type3.is_null())) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid param type", K(ret), K(type1), K(type2), K(type3));
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} else {
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type1.set_calc_meta(type1.get_obj_meta());
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type2.set_calc_meta(type2.get_obj_meta());
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type3.set_calc_meta(type3.get_obj_meta());
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type.set_meta(type1.get_obj_meta());
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type.set_accuracy(type1.get_accuracy());
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if (lib::is_oracle_mode()) {
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type2.set_calc_type(ObNumberType);
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type2.set_calc_scale(NUMBER_SCALE_UNKNOWN_YET);
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} else {
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type2.set_calc_type(ObIntType);
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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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} |