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src/sql/engine/expr/ob_expr_quote.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 "ob_expr_quote.h"
+#include "lib/oblog/ob_log.h"
+#include "share/object/ob_obj_cast.h"
+#include "sql/parser/ob_item_type.h"
+//#include "sql/engine/expr/ob_expr_promotion_util.h"
+#include "sql/session/ob_sql_session_info.h"
+
+namespace oceanbase {
+using namespace common;
+namespace sql {
+
+ObExprQuote::ObExprQuote(ObIAllocator& alloc) : ObStringExprOperator(alloc, T_OP_QUOTE, N_QUOTE, 1)
+{}
+
+ObExprQuote::~ObExprQuote()
+{}
+
+int ObExprQuote::calc_result_type1(ObExprResType& type, ObExprResType& type1, ObExprTypeCtx& type_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (is_oracle_mode()) {
+    const ObSQLSessionInfo* session = type_ctx.get_session();
+    if (OB_ISNULL(session)) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("session is NULL", K(ret));
+    } else {
+      ObSEArray<ObExprResType*, 1, ObNullAllocator> params;
+      OZ(params.push_back(&type1));
+      OZ(aggregate_string_type_and_charset_oracle(*session, params, type));
+      OZ(deduce_string_param_calc_type_and_charset(*session, type, params));
+    }
+  } else {
+    type.set_varchar();
+    type.set_length(type1.get_length());
+    if OB_FAIL (aggregate_charsets_for_string_result(type, &type1, 1, type_ctx.get_coll_type())) {
+      LOG_WARN("aggregate charset for res failed", K(ret));
+    } else {
+      type1.set_calc_type(ObVarcharType);
+      type1.set_calc_collation_type(type.get_collation_type());
+    }
+  }
+  return ret;
+}
+
+int ObExprQuote::calc_result1(ObObj& result, const ObObj& obj, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (OB_ISNULL(expr_ctx.calc_buf_)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("calc buf is NULL", K(ret));
+  } else if (obj.is_null()) {
+    // in mysql, quote(null) does not return nulltype but 'null' (without enclosing single quotation marks)
+    char* buf = reinterpret_cast<char*>(expr_ctx.calc_buf_->alloc(LEN_OF_NULL));
+    if (NULL == buf) {  // alloc memory failed
+      ret = OB_ALLOCATE_MEMORY_FAILED;
+      LOG_ERROR("alloc memory failed.", K(ret));
+    } else {
+      MEMCPY(buf, "NULL", LEN_OF_NULL);
+      ObString obstr;
+      obstr.assign_ptr(buf, LEN_OF_NULL);
+      result.set_varchar(obstr);
+      result.set_collation(result_type_);
+    }
+  } else {
+    ObString str = obj.get_string();
+    ObString res_str;
+    if (OB_FAIL(calc(res_str, str, obj.get_collation_type(), expr_ctx.calc_buf_))) {
+      LOG_WARN("calc quote expr failed", K(ret), K(str));
+    } else {
+      result.set_varchar(res_str);
+      result.set_collation(result_type_);
+    }
+  }
+  return ret;
+}
+
+int ObExprQuote::string_write_buf(const ObString& str, char* buf, const int64_t buf_len, int64_t& pos)
+{
+  int ret = OB_SUCCESS;
+  if (OB_LIKELY(!str.empty())) {
+    if (OB_UNLIKELY(pos + str.length() > buf_len)) {
+      ret = OB_SIZE_OVERFLOW;
+    } else {
+      MEMCPY(buf + pos, str.ptr(), str.length());
+      pos += str.length();
+    }
+  }
+  return ret;
+}
+
+int ObExprQuote::calc(ObString& res_str, ObString str, ObCollationType coll_type,
+    ObIAllocator* allocator)  // make sure alloc() is called once
+{
+  int ret = OB_SUCCESS;
+  if (OB_ISNULL(allocator)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("calc buf is NULL", K(ret));
+  } else {
+    ObString escape_char = ObCharsetUtils::get_const_str(coll_type, '\\');
+    int64_t buf_len = str.length() * 2 + 2 * escape_char.length();
+    int64_t pos = 0;
+    char* buf = reinterpret_cast<char*>(allocator->alloc(buf_len));
+    if (NULL == buf) {  // alloc memory failed
+      ret = OB_ALLOCATE_MEMORY_FAILED;
+      LOG_ERROR("alloc memory failed.", K(ret));
+    } else {
+      auto handle_char_func = [&](ObString code_point, int wchar) -> int {
+        int ret = OB_SUCCESS;
+        switch (wchar) {
+          case '\0': {
+            OZ(string_write_buf(escape_char, buf, buf_len, pos));
+            OZ(string_write_buf(ObCharsetUtils::get_const_str(coll_type, '0'), buf, buf_len, pos));
+            break;
+          }
+          case '\'': {
+            OZ(string_write_buf(escape_char, buf, buf_len, pos));
+            OZ(string_write_buf(ObCharsetUtils::get_const_str(coll_type, '\''), buf, buf_len, pos));
+            break;
+          }
+          case '\\': {
+            OZ(string_write_buf(escape_char, buf, buf_len, pos));
+            OZ(string_write_buf(escape_char, buf, buf_len, pos));
+            break;
+          }
+          case '\032': {
+            OZ(string_write_buf(escape_char, buf, buf_len, pos));
+            OZ(string_write_buf(ObCharsetUtils::get_const_str(coll_type, 'Z'), buf, buf_len, pos));
+            break;
+          }
+          default: {
+            OZ(string_write_buf(code_point, buf, buf_len, pos));
+            break;
+          }
+        }
+        LOG_DEBUG("debug result", K(wchar), KPHEX(buf, pos));
+        return ret;
+      };
+      OZ(string_write_buf(ObCharsetUtils::get_const_str(coll_type, '\''), buf, buf_len, pos));
+      OZ(ObCharsetUtils::foreach_char(str, coll_type, handle_char_func));
+      OZ(string_write_buf(ObCharsetUtils::get_const_str(coll_type, '\''), buf, buf_len, pos));
+      res_str.assign_ptr(buf, pos);
+    }
+  }
+  return ret;
+}
+
+int ObExprQuote::calc_quote_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* arg = NULL;
+  if (OB_FAIL(expr.eval_param_value(ctx, arg))) {
+    LOG_WARN("eval param failed", K(ret));
+  } else if (arg->is_null()) {
+    // in mysql, quote(null) does not return nulltype but 'null'
+    // (without enclosing single quotation marks)
+    ObExprStrResAlloc res_alloc(expr, ctx);
+    char* buf = reinterpret_cast<char*>(res_alloc.alloc(LEN_OF_NULL));
+    if (NULL == buf) {
+      ret = OB_ALLOCATE_MEMORY_FAILED;
+      LOG_ERROR("alloc memory failed.", K(ret));
+    } else {
+      MEMCPY(buf, "NULL", LEN_OF_NULL);
+      res_datum.set_string(buf, LEN_OF_NULL);
+    }
+  } else {
+    const ObString& str = arg->get_string();
+    ObString res_str;
+    ObExprStrResAlloc res_alloc(expr, ctx);
+    if (OB_FAIL(calc(res_str, str, expr.datum_meta_.cs_type_, &res_alloc))) {
+      LOG_WARN("calc quote expr failed", K(ret), K(str));
+    } else {
+      res_datum.set_string(res_str);
+    }
+  }
+  return ret;
+}
+
+int ObExprQuote::cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr_cg_ctx);
+  UNUSED(raw_expr);
+  rt_expr.eval_func_ = calc_quote_expr;
+  return ret;
+}
+}  // namespace sql
+}  // namespace oceanbase