support function crc32

2021-09-13 18:01:41 +08:00
parent c19f7ea941
commit 02e3302d08
7 changed files with 154 additions and 0 deletions
--- a/src/sql/engine/expr/ob_expr_crc32.cpp
+++ b/src/sql/engine/expr/ob_expr_crc32.cpp
@ -0,0 +1,108 @@
+/**
+ * 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 "lib/compress/zlib/zlib.h"
+#include "lib/charset/ob_charset.h"
+#include "lib/ob_name_def.h"
+#include "lib/utility/ob_macro_utils.h"
+#include "share/object/ob_obj_cast.h"
+#include "sql/engine/expr/ob_expr_crc32.h"
+#include "sql/engine/expr/ob_expr_util.h"
+#include "sql/session/ob_sql_session_info.h"
+
+namespace oceanbase {
+using namespace common;
+
+namespace sql {
+ObExprCrc32::ObExprCrc32(ObIAllocator& alloc)
+    : ObFuncExprOperator(alloc, T_FUN_SYS_CRC32, N_CRC32, 1, NOT_ROW_DIMENSION)
+{}
+
+int ObExprCrc32::calc_result_type1(ObExprResType& type, ObExprResType& type1, ObExprTypeCtx& type_ctx) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(type_ctx);
+  type.set_precision(10);
+  type.set_uint32();
+  if (OB_LIKELY(type1.is_not_null())) {
+    type.set_result_flag(OB_MYSQL_NOT_NULL_FLAG);
+  }
+
+  if (ob_is_string_type(type1.get_type())) {
+    type1.set_calc_type(type1.get_type());
+    type1.set_calc_collation_type(type1.get_collation_type());
+  } else {
+    type1.set_calc_type(ObVarcharType);
+    type1.set_calc_collation_type(ObCharset::get_system_collation());
+  }
+  return ret;
+}
+
+int ObExprCrc32::calc_result1(common::ObObj& obj, const common::ObObj& obj1, 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 if (obj1.is_null()) {
+    obj.set_null();
+  } else {
+    uint64_t val;
+    ObString str_val = obj1.get_string();
+
+    if (str_val.length() <= 0) {
+      val = 0ULL;
+    } else {
+      val = crc32(0, reinterpret_cast<unsigned char*>(str_val.ptr()), str_val.length());
+    }
+    obj.set_uint32(val);
+  }
+  return ret;
+}
+
+int ObExprCrc32::calc_crc32_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum)
+{
+  int ret = OB_SUCCESS;
+  unsigned char* buf = NULL;
+  ObDatum* s_datum = NULL;
+  if (OB_FAIL(expr.args_[0]->eval(ctx, s_datum))) {
+    LOG_WARN("eval arg failed", K(ret));
+  } else if (s_datum->is_null()) {
+    res_datum.set_null();
+  } else {
+    const ObString& str_val = s_datum->get_string();
+    if (str_val.empty()) {
+      res_datum.set_uint(0ULL);
+    } else {
+      buf = reinterpret_cast<unsigned char*>(const_cast<char*>(str_val.ptr()));
+      res_datum.set_uint(crc32(0, buf, str_val.length()));
+    }
+  }
+  return ret;
+}
+
+int ObExprCrc32::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);
+  CK(1 == rt_expr.arg_cnt_);
+  CK(!OB_ISNULL(rt_expr.args_) && !OB_ISNULL(rt_expr.args_[0]));
+  CK(ob_is_string_type(rt_expr.args_[0]->datum_meta_.type_));
+  rt_expr.eval_func_ = calc_crc32_expr;
+  return ret;
+}
+
+}  // namespace sql
+}  // namespace oceanbase