support function crc32

deps/oblib/src/lib/ob_name_def.h

@@ -397,6 +397,7 @@
 #define N_INSERT "insert"
 #define N_SUBSTRING_INDEX "substring_index"
 #define N_MD5 "md5"
+#define N_CRC32 "crc32"
 #define N_HEX "hex"
 #define N_UNHEX "unhex"
 #define N_HEXTORAW "hextoraw"

src/sql/CMakeLists.txt

@@ -222,6 +222,7 @@ ob_set_subtarget(ob_sql engine
   engine/expr/ob_expr_conv.cpp
   engine/expr/ob_expr_convert.cpp
   engine/expr/ob_expr_cosh.cpp
+  engine/expr/ob_expr_crc32.cpp
   engine/expr/ob_expr_timezone.cpp
   engine/expr/ob_expr_tz_offset.cpp
   engine/expr/ob_expr_from_tz.cpp

src/sql/engine/expr/ob_expr_crc32.cpp

+/**
+ * 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
\ No newline at end of file

src/sql/engine/expr/ob_expr_crc32.h

+/**
+ * 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.
+ */
+
+#ifndef OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_CRC32_
+#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_CRC32_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprCrc32 : public ObFuncExprOperator {
+public:
+  explicit ObExprCrc32(common::ObIAllocator& alloc);
+  virtual ~ObExprCrc32(){};
+  static int calc_crc32(common::ObObj& obj, const common::ObObj& obj1, common::ObExprCtx& expr_ctx);
+
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+
+  virtual int calc_result1(common::ObObj& obj, const common::ObObj& obj1, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+  static int calc_crc32_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprCrc32);
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+
+#endif  // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_CRC32_
\ No newline at end of file

src/sql/engine/expr/ob_expr_eval_functions.cpp

@@ -50,6 +50,7 @@
 #include "ob_expr_like.h"
 #include "ob_expr_lower.h"
 #include "ob_expr_md5.h"
+#include "ob_expr_crc32.h"
 #include "ob_expr_mid.h"
 #include "ob_expr_minus.h"
 #include "ob_expr_mod.h"
@@ -715,6 +716,7 @@ static ObExpr::EvalFunc g_expr_eval_functions[] = {
     ObExprInetAton::calc_inet_aton,           /* 456 */
     ObExprInet6Ntoa::calc_inet6_ntoa,         /* 457 */
     ObExprConvertTZ::eval_convert_tz,         /* 458 */
+    ObExprCrc32::calc_crc32_expr,             /* 459 */
 };
 
 REG_SER_FUNC_ARRAY(OB_SFA_SQL_EXPR_EVAL, g_expr_eval_functions, ARRAYSIZEOF(g_expr_eval_functions));

src/sql/engine/expr/ob_expr_operator_factory.cpp

@@ -170,6 +170,7 @@
 #include "sql/engine/expr/ob_expr_reverse.h"
 #include "sql/engine/expr/ob_expr_right.h"
 #include "sql/engine/expr/ob_expr_md5.h"
+#include "sql/engine/expr/ob_expr_crc32.h"
 #include "sql/engine/expr/ob_expr_lrpad.h"
 #include "sql/engine/expr/ob_expr_conv.h"
 #include "sql/engine/expr/ob_expr_sign.h"
@@ -629,6 +630,7 @@ void ObExprOperatorFactory::register_expr_operators()
   REG_OP(ObExprIfNull);
   REG_OP(ObExprConcatWs);
   REG_OP(ObExprCmpMeta);
+  REG_OP(ObExprCrc32);
   REG_OP(ObExprQuote);
   REG_OP(ObExprPad);
   REG_OP(ObExprHostIP);

src/sql/parser/ob_item_type.h

@@ -435,6 +435,7 @@ typedef enum ObItemType {
   T_FUN_SYS_IS_IPV4_MAPPED = 719,
   T_FUN_SYS_IS_IPV4_COMPAT = 720,
   T_FUN_SYS_INETATON = 721,
+  T_FUN_SYS_CRC32 = 722,
   ///< @note add new mysql only function type before this line
   T_MYSQL_ONLY_SYS_MAX_OP = 800,