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src/sql/engine/expr/ob_expr_hextoraw.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 <string.h>
+#include "sql/parser/ob_item_type.h"
+#include "sql/engine/expr/ob_expr_hextoraw.h"
+#include "sql/engine/expr/ob_expr_unhex.h"
+#include "sql/engine/expr/ob_datum_cast.h"
+#include "sql/engine/expr/ob_expr_operator.h"
+#include "share/object/ob_obj_cast.h"
+#include "lib/oblog/ob_log.h"
+#include "sql/session/ob_sql_session_info.h"
+using namespace oceanbase::common;
+
+namespace oceanbase {
+namespace sql {
+
+ObExprHextoraw::ObExprHextoraw(ObIAllocator& alloc) : ObStringExprOperator(alloc, T_FUN_SYS_HEXTORAW, N_HEXTORAW, 1)
+{
+  disable_operand_auto_cast();
+}
+
+ObExprHextoraw::~ObExprHextoraw()
+{}
+
+int ObExprHextoraw::calc_result_type1(ObExprResType& type, ObExprResType& text, ObExprTypeCtx& type_ctx) const
+{
+  UNUSED(type_ctx);
+
+  type.set_collation_level(common::CS_LEVEL_NUMERIC);
+  type.set_collation_type(common::CS_TYPE_BINARY);
+  type.set_raw();
+
+  common::ObObjType param_type = text.get_type();
+  common::ObLength length = -1;
+  const int64_t oracle_max_avail_len = 40;
+  if (ob_is_numeric_type(param_type)) {
+    length = oracle_max_avail_len;  // enough !
+  } else if (ob_is_string_type(param_type)) {
+    length = text.get_length() / 2 + (text.get_length() % 2);
+  }
+  if (length <= 0 || length > common::OB_MAX_VARCHAR_LENGTH) {
+    length = common::OB_MAX_VARCHAR_LENGTH;
+  }
+  type.set_length(length);
+  return common::OB_SUCCESS;
+}
+
+int ObExprHextoraw::calc_result1(common::ObObj& result, const ObObj& text, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  if (OB_ISNULL(expr_ctx.calc_buf_)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("varchar buffer not init", K(ret));
+  } else {
+    EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
+    cast_ctx.expect_obj_collation_ = CS_TYPE_BINARY;
+    if (OB_FAIL(ObHexUtils::hextoraw(text, cast_ctx, result))) {
+      LOG_WARN("fail to calc", K(ret), K(text));
+    } else if (OB_LIKELY(!result.is_null())) {
+      result.set_collation(result_type_);
+    }
+  }
+  return ret;
+}
+
+int ObExprHextoraw::calc_hextoraw_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* arg = NULL;
+  if (OB_UNLIKELY(1 != expr.arg_cnt_)) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("invalid arg cnt", K(ret), K(expr.arg_cnt_));
+  } else if (OB_FAIL(expr.args_[0]->eval(ctx, arg))) {
+    LOG_WARN("eval arg failed", K(ret));
+  } else if (arg->is_null()) {
+    res_datum.set_null();
+  } else if (OB_FAIL(ObDatumHexUtils::hextoraw(
+                 expr, *arg, expr.args_[0]->datum_meta_.type_, expr.args_[0]->datum_meta_.cs_type_, ctx, res_datum))) {
+    LOG_WARN("hextoraw failed", K(ret));
+  }
+  return ret;
+}
+
+int ObExprHextoraw::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_hextoraw_expr;
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase