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src/sql/engine/expr/ob_expr_conv.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_conv.h"
+
+//#include <m_string.h>
+//#include "lib/regex/include/m_string.h"
+
+#include "lib/oblog/ob_log.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"
+
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+namespace oceanbase {
+namespace sql {
+
+ObExprConv::ObExprConv(ObIAllocator& alloc) : ObStringExprOperator(alloc, T_OP_CONV, N_CONV, 3)
+{}
+
+ObExprConv::~ObExprConv()
+{
+  // TODO Auto-generated destructor stub
+}
+
+/*
+ * ObExprConv(str/int, base_from, base_to)
+ */
+inline int ObExprConv::calc_result_type3(ObExprResType& type, ObExprResType& type1, ObExprResType& type2,
+    ObExprResType& type3, common::ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+  int ret = OB_SUCCESS;
+  CK(OB_NOT_NULL(type_ctx.get_session()));
+  if (OB_SUCC(ret)) {
+    type.set_varchar();
+    type.set_collation_type(get_default_collation_type(type.get_type(), *type_ctx.get_session()));
+    type.set_collation_level(CS_LEVEL_COERCIBLE);
+    type.set_length(64);
+  }
+
+  // Check ObUInt64Type to prevent repeated implicit cast
+  if (type1.get_type() == ObBitType) {
+    type1.set_calc_type(ObBitType);
+    type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_NO_RANGE_CHECK);
+  } else {
+    type1.set_calc_type_default_varchar();
+  }
+  type2.set_calc_type(ObInt32Type);
+  type3.set_calc_type(ObInt32Type);
+
+  return ret;
+}
+
+int ObExprConv::calc_result3(
+    ObObj& result, const ObObj& obj1, const ObObj& obj2, const ObObj& obj3, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (obj1.is_null() || obj2.is_null() || obj3.is_null()) {
+    result.set_null();
+  } else {
+    if (ObBitType != obj1.get_type()) {
+      TYPE_CHECK(obj1, ObVarcharType);
+    }
+    TYPE_CHECK(obj2, ObInt32Type);
+    TYPE_CHECK(obj3, ObInt32Type);
+    int32_t from_base = obj2.get_int32();
+    int32_t to_base = obj3.get_int32();
+    int64_t dec = 0;
+    if (INT32_MIN == from_base || INT32_MIN == to_base || abs(from_base) < MIN_BASE || abs(from_base) > MAX_BASE ||
+        abs(to_base) < MIN_BASE || abs(to_base) > MAX_BASE) {
+      result.set_null();
+    } else if (OB_ISNULL(expr_ctx.calc_buf_)) {
+      ret = OB_NOT_INIT;
+      LOG_WARN("allocator is null", K(ret));
+    } else {
+      char* res_ptr = reinterpret_cast<char*>(expr_ctx.calc_buf_->alloc(MAX_LENGTH));
+      if (NULL != res_ptr) {
+        int err = 0;  // though err != 0 , we still use dec as the valid argument of next step.
+        if (ObBitType == obj1.get_type()) {
+          dec = obj1.get_uint64();
+        } else {
+          ObString str = obj1.get_string();
+          if (from_base < 0) {
+            dec = ObCharset::strntoll(str.ptr(), str.length(), -from_base, &err);
+          } else {
+            dec = static_cast<int64_t>(ObCharset::strntoull(str.ptr(), str.length(), from_base, &err));
+          }
+        }
+        char* ptr = NULL;
+        if (OB_ISNULL(ptr = ObCharset::lltostr(dec, res_ptr, to_base, 1))) {
+          result.set_null();
+        } else {
+          ObString str;
+          str.assign_ptr(res_ptr, static_cast<int32_t>(ptr - res_ptr));
+          result.set_varchar(str);
+          result.set_collation(result_type_);
+        }
+      } else {
+        ret = OB_ALLOCATE_MEMORY_FAILED;
+        LOG_ERROR("alloc memory failed", K(ret));
+      }
+    }
+  }
+  return ret;
+}
+
+int ObExprConv::cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(op_cg_ctx);
+  UNUSED(raw_expr);
+  rt_expr.eval_func_ = ObExprConv::eval_conv;
+
+  return ret;
+}
+
+int ObExprConv::eval_conv(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* param_0 = NULL;
+  ObDatum* param_1 = NULL;
+  ObDatum* param_2 = NULL;
+  if (OB_FAIL(expr.args_[0]->eval(ctx, param_0)) || OB_FAIL(expr.args_[1]->eval(ctx, param_1)) ||
+      OB_FAIL(expr.args_[2]->eval(ctx, param_2))) {
+    LOG_WARN("fail to eval conv", K(ret), K(expr));
+  } else if (param_0->is_null() || param_1->is_null() || param_2->is_null()) {
+    res_datum.set_null();
+  } else {
+    int32_t from_base = param_1->get_int32();
+    int32_t to_base = param_2->get_int32();
+    int64_t dec = 0;
+    if (INT32_MIN == from_base || INT32_MIN == to_base || abs(from_base) < MIN_BASE || abs(from_base) > MAX_BASE ||
+        abs(to_base) < MIN_BASE || abs(to_base) > MAX_BASE) {
+      res_datum.set_null();
+    } else {
+      char* res_ptr = expr.get_str_res_mem(ctx, MAX_LENGTH);
+      if (NULL != res_ptr) {
+        if (ObBitType == expr.args_[0]->datum_meta_.type_) {
+          dec = param_0->get_uint();
+        } else {
+          ObString str = param_0->get_string();
+          int err = 0;  // though err != 0 , we still use dec as the valid argument of next step.
+          if (from_base < 0) {
+            dec = ObCharset::strntoll(str.ptr(), str.length(), -from_base, &err);
+          } else {
+            dec = static_cast<int64_t>(ObCharset::strntoull(str.ptr(), str.length(), from_base, &err));
+          }
+        }
+        char* ptr = NULL;
+        if (OB_ISNULL(ptr = ObCharset::lltostr(dec, res_ptr, to_base, 1))) {
+          res_datum.set_null();
+        } else {
+          res_datum.set_string(res_ptr, static_cast<int64_t>(ptr - res_ptr));
+        }
+      } else {
+        ret = OB_ALLOCATE_MEMORY_FAILED;
+        LOG_ERROR("alloc memory failed", K(ret));
+      }
+    }
+  }
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase