support json type

src/sql/engine/expr/ob_expr_json_valid.cpp

@@ -0,0 +1,171 @@
+/**
+ * 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.
+ */
+
+// This file contains implementation for json_valid.
+#define USING_LOG_PREFIX SQL_ENG
+#include "ob_expr_json_valid.h"
+#include "sql/engine/expr/ob_expr_json_func_helper.h"
+#include "sql/engine/expr/ob_expr_util.h"
+#include "share/object/ob_obj_cast.h"
+#include "sql/parser/ob_item_type.h"
+#include "sql/session/ob_sql_session_info.h"
+#include "lib/json_type/ob_json_tree.h"
+
+using namespace oceanbase::common;
+using namespace oceanbase::sql;
+
+namespace oceanbase
+{
+namespace sql
+{
+ObExprJsonValid::ObExprJsonValid(ObIAllocator &alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_JSON_VALID, N_JSON_VALID, 1, NOT_ROW_DIMENSION)
+{
+}
+
+ObExprJsonValid::~ObExprJsonValid()
+{
+}
+
+int ObExprJsonValid::calc_result_type1(ObExprResType &type,
+                                       ObExprResType &type1,
+                                       common::ObExprTypeCtx &type_ctx) const
+{
+  UNUSED(type_ctx); 
+  INIT_SUCC(ret);
+
+  // set result type to int32
+  type.set_int32();
+  type.set_scale(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].scale_);
+  type.set_precision(common::ObAccuracy::DDL_DEFAULT_ACCURACY[common::ObIntType].precision_);
+
+  ObObjType in_type = type1.get_type();
+  if (in_type == ObNullType) {
+  } else if (in_type == ObJsonType) {
+    // do nothing
+  } else if (ob_is_string_type(in_type)) {
+    if (type1.get_collation_type() == CS_TYPE_BINARY) {
+      type1.set_calc_collation_type(CS_TYPE_BINARY);
+    } else {
+      if (type1.get_charset_type() != CHARSET_UTF8MB4) {
+        type1.set_calc_collation_type(CS_TYPE_UTF8MB4_BIN);
+      }
+    }
+  } else {
+    // other type is invalid, handle in ObExprJsonValid::eval_json_valid
+  }
+  
+  return ret;
+}
+
+template <typename T>
+int ObExprJsonValid::calc(const T &data, ObObjType type, ObCollationType cs_type,
+                          ObIAllocator *allocator, T &res)
+{
+  INIT_SUCC(ret);
+  bool is_null = false;
+  bool is_empty_text = false;
+  bool is_invalid = false;
+
+  if (!ObJsonExprHelper::is_convertible_to_json(type)) {
+    is_invalid = true;
+  } else if (type == ObNullType || data.is_null()) {
+    is_null = true;
+  } else if (ob_is_string_type(type) && cs_type == CS_TYPE_BINARY) {
+    is_invalid = true;
+  } else {
+    common::ObString j_text = data.get_string();
+    if (OB_UNLIKELY(j_text == "")) {
+      if (type == ObJsonType) {
+        is_null = true;
+      } else {
+        is_invalid = true;
+      }
+    } else if (type == ObJsonType) { // json bin
+      ObIJsonBase *j_bin = NULL;
+      if (ObJsonBaseFactory::get_json_base(allocator, j_text, ObJsonInType::JSON_BIN,
+          ObJsonInType::JSON_BIN, j_bin)) {
+        LOG_WARN("fail to get json base", K(ret), K(type), K(j_text));
+      }
+    } else { // json tree
+      if (OB_FAIL(ObJsonParser::check_json_syntax(j_text, allocator))) {
+        LOG_WARN("fail to check json syntax", K(ret), K(type), K(j_text));
+      }
+    }
+  }
+
+  if (OB_SUCC(ret)) {
+    if (OB_UNLIKELY(is_null)) {
+      res.set_null();
+    } else {
+      res.set_int(static_cast<int64_t>(!is_invalid));
+    }
+  } else if (ret == OB_ERR_INVALID_JSON_TEXT) {
+    res.set_int(0);
+    ret = OB_SUCCESS;
+  } else if (ret == OB_ERR_JSON_OUT_OF_DEPTH) {
+    LOG_USER_ERROR(OB_ERR_JSON_OUT_OF_DEPTH);
+  }
+
+  return ret;
+}
+
+// for old sql engine
+int ObExprJsonValid::calc_result1(common::ObObj &result, const common::ObObj &obj,
+                                  common::ObExprCtx &expr_ctx) const
+{
+  INIT_SUCC(ret);
+  ObCollationType cs_type = obj.get_collation_type();
+  ObObjType in_type =  input_types_.at(0).get_calc_type();
+
+  if (OB_ISNULL(expr_ctx.calc_buf_)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("varchar buffer not init", K(ret));
+  } else if (OB_FAIL(calc(obj, in_type, cs_type, expr_ctx.calc_buf_, result))) {
+    LOG_WARN("fail to calc json valid result", K(ret), K(in_type));
+  }
+
+  return ret;
+}
+
+// for new sql engine
+int ObExprJsonValid::eval_json_valid(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &res)
+{
+  INIT_SUCC(ret);
+  ObDatum *datum = NULL;
+  ObExpr *arg = expr.args_[0];
+  ObCollationType cs_type = arg->datum_meta_.cs_type_;
+
+  if (OB_FAIL(arg->eval(ctx, datum))) {
+    LOG_WARN("eval json arg failed", K(ret));
+  } else {
+    common::ObIAllocator &tmp_allocator = ctx.get_reset_tmp_alloc();
+    if (OB_FAIL(calc(*datum, arg->datum_meta_.type_, cs_type, &tmp_allocator, res))) {
+      LOG_WARN("fail to calc json valid result", K(ret), K(arg->datum_meta_.type_));
+    }
+  } 
+
+  return ret;
+}
+
+int ObExprJsonValid::cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr,
+                             ObExpr &rt_expr) const
+{
+  UNUSED(expr_cg_ctx);
+  UNUSED(raw_expr);
+  rt_expr.eval_func_ = eval_json_valid;
+  return OB_SUCCESS;
+}
+
+
+}
+}