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src/sql/engine/expr/ob_expr_space.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 "sql/engine/expr/ob_expr_space.h"
+
+#include "lib/utility/ob_macro_utils.h"
+
+#include "sql/engine/expr/ob_expr_repeat.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "sql/engine/ob_exec_context.h"
+
+namespace oceanbase {
+namespace sql {
+using namespace common;
+ObExprSpace::ObExprSpace(ObIAllocator& alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_SPACE, N_SPACE, 1, NOT_ROW_DIMENSION)
+{}
+
+inline int ObExprSpace::calc_result_type1(ObExprResType& type, ObExprResType& type1, ObExprTypeCtx& type_ctx) const
+{
+  int ret = OB_SUCCESS;
+  // space is mysql only expr
+  CK(lib::is_mysql_mode());
+
+  type.set_type(ObVarcharType);
+  type.set_collation_level(type1.get_collation_level());
+  type.set_collation_type(get_default_collation_type(type.get_type(), *type_ctx.get_session()));
+  type.set_length(OB_MAX_VARCHAR_LENGTH);
+  type1.set_calc_type(ObIntType);
+  // Set cast mode for parameter casting, truncate string to integer.
+  type_ctx.set_cast_mode(type_ctx.get_cast_mode() | CM_STRING_INTEGER_TRUNC);
+  return ret;
+}
+
+int ObExprSpace::calc_result1(ObObj& result, const ObObj& count, ObExprCtx& expr_ctx) const
+{
+  int ret = OB_SUCCESS;
+  int64_t max_allow_packet_size = 0;
+  EXPR_DEFINE_CAST_CTX(expr_ctx, CM_NONE);
+  if (count.is_null()) {
+    result.set_null();
+  } else {
+    if (OB_ISNULL(expr_ctx.my_session_)) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("Unexpected null session in space function", K(ret));
+    } else if (OB_FAIL(expr_ctx.my_session_->get_max_allowed_packet(max_allow_packet_size))) {
+      if (OB_ENTRY_NOT_EXIST == ret) {  // for compatibility with server before 1470
+        ret = OB_SUCCESS;
+        max_allow_packet_size = OB_MAX_VARCHAR_LENGTH;
+      } else {
+        LOG_WARN("Failed to get max allow packet size", K(ret));
+      }
+    }
+    if (OB_SUCC(ret)) {
+      TYPE_CHECK(count, ObIntType);
+      ObString local_text(1, " ");
+      int64_t local_count = count.get_int();
+      if ((local_count > max_allow_packet_size)) {
+        LOG_WARN(
+            "Result of space was larger than max_allow_packet_size", K(ret), K(local_count), K(max_allow_packet_size));
+        LOG_USER_WARN(OB_ERR_FUNC_RESULT_TOO_LARGE, "space", static_cast<int>(max_allow_packet_size));
+        result.set_null();
+      } else if (OB_FAIL(ObExprRepeat::calc(
+                     result, ObVarcharType, local_text, local_count, expr_ctx.calc_buf_, max_allow_packet_size))) {
+        LOG_WARN("Failed to cacl result");
+      }
+    }
+  }
+  if (OB_FAIL(ret)) {
+    LOG_WARN("Calc result error", K(ret));
+  } else if (OB_LIKELY(!result.is_null())) {
+    result.set_collation(result_type_);
+  } else {
+    // do nothing
+  }
+  return ret;
+}
+
+int ObExprSpace::cg_expr(ObExprCGCtx&, const ObRawExpr&, ObExpr& rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  CK(1 == rt_expr.arg_cnt_);
+  rt_expr.eval_func_ = eval_space;
+  return ret;
+}
+
+int ObExprSpace::eval_space(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum)
+{
+  int ret = OB_SUCCESS;
+  ObDatum* count = NULL;
+  int64_t max_size = 0;
+  bool is_null = false;
+  ObString output;
+  ObString space(1, " ");
+  ObExprStrResAlloc expr_res_alloc(expr, ctx);
+  if (OB_FAIL(expr.args_[0]->eval(ctx, count))) {
+    LOG_WARN("evaluate parameters failed", K(ret));
+  } else if (count->is_null()) {
+    expr_datum.set_null();
+  } else if (OB_FAIL(ctx.exec_ctx_.get_my_session()->get_max_allowed_packet(max_size))) {
+    LOG_WARN("get max length failed", K(ret));
+  } else if (count->get_int() > max_size) {
+    LOG_WARN("Result of space was larger than max_allow_packet_size", K(count->get_int()), K(max_size));
+    LOG_USER_WARN(OB_ERR_FUNC_RESULT_TOO_LARGE, "space", static_cast<int>(max_size));
+    expr_datum.set_null();
+  } else if (OB_FAIL(ObExprRepeat::repeat(output, is_null, space, count->get_int(), expr_res_alloc, max_size))) {
+    LOG_WARN("do repeat failed", K(ret));
+  } else {
+    if (is_null) {
+      expr_datum.set_null();
+    } else {
+      expr_datum.set_string(output);
+    }
+  }
+
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase