Support uuid_short in mysql mode.

src/sql/engine/expr/ob_expr_uuid_short.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright 2014-2021 Alibaba Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * ob_expr_uuid_short.h is for uuid_short function
+ *
+ * Date: 2021/8/20
+ *
+ * Authors:
+ *     ailing.lcq<ailing.lcq@alibaba-inc.com>
+ *
+ */
+#ifndef _OB_EXPR_UUID_SHORT_H_
+#define _OB_EXPR_UUID_SHORT_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprUuidShort : public ObFuncExprOperator {
+public:
+  explicit ObExprUuidShort(common::ObIAllocator &alloc);
+  virtual ~ObExprUuidShort();
+
+  virtual int calc_result_type0(ObExprResType &type, common::ObExprTypeCtx &type_ctx) const;
+  virtual int calc_result0(common::ObObj &result, common::ObExprCtx &expr_ctx) const;
+
+  virtual int cg_expr(ObExprCGCtx &expr_cg_ctx, const ObRawExpr &raw_expr, ObExpr &rt_expr) const override;
+
+  static int eval_uuid_short(const ObExpr &expr, ObEvalCtx &ctx, ObDatum &expr_datum);
+
+private:
+  static uint64_t generate_uuid_short();
+  DISALLOW_COPY_AND_ASSIGN(ObExprUuidShort) const;
+};
+
+inline int ObExprUuidShort::calc_result_type0(ObExprResType &type, common::ObExprTypeCtx &type_ctx) const
+{
+  UNUSED(type_ctx);
+  type.set_uint64();
+  return common::OB_SUCCESS;
+}
+
+}  // namespace sql
+}  // namespace oceanbase
+#endif /* _OB_EXPR_UUID_SHORT_H_ */
+
+// select uuid_short();