[FEAT MERGE] [v4.2] add table generator and several random utility functions

2023-04-13 08:22:22 +00:00
parent 94159e6675
commit 27488211d2
34 changed files with 1659 additions and 79 deletions
--- a/src/sql/engine/expr/ob_expr_generator_func.cpp
+++ b/src/sql/engine/expr/ob_expr_generator_func.cpp
@ -0,0 +1,105 @@
+/**
+ * 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_generator_func.h"
+#include "sql/engine/ob_exec_context.h"
+
+namespace oceanbase
+{
+using namespace common;
+namespace sql
+{
+
+ObExprGeneratorFunc::ObExprGeneratorFunc(common::ObIAllocator &alloc)
+	: ObFuncExprOperator(alloc, T_FUN_SYS_GENERATOR, "generator", 1, NOT_ROW_DIMENSION)
+{
+}
+
+ObExprGeneratorFunc::~ObExprGeneratorFunc()
+{
+}
+
+int ObExprGeneratorFunc::calc_result_type1(ObExprResType &type,
+                                           ObExprResType &limit,
+                                           common::ObExprTypeCtx &type_ctx) const
+{
+  UNUSED(type_ctx);
+  int ret = OB_SUCCESS;
+  limit.set_calc_type(ObIntType);
+  type.set_int();
+  return ret;
+}
+
+int ObExprGeneratorFunc::eval_next_value(const ObExpr &expr,
+                                     ObEvalCtx &ctx,
+                                     ObDatum &res_datum)
+{
+  int ret = OB_SUCCESS;
+  ObExprGeneratorFuncCtx *generator_ctx = NULL;
+  uint64_t op_id = expr.expr_ctx_id_;
+  ObExecContext &exec_ctx = ctx.exec_ctx_;
+  if (OB_ISNULL(generator_ctx = static_cast<ObExprGeneratorFuncCtx *>(
+              exec_ctx.get_expr_op_ctx(op_id)))) {
+    if (OB_FAIL(exec_ctx.create_expr_op_ctx(op_id, generator_ctx))) {
+      LOG_WARN("failed to create operator ctx", K(ret), K(op_id));
+    } else if (OB_ISNULL(generator_ctx)) {
+      ret = OB_ALLOCATE_MEMORY_FAILED;
+      LOG_WARN("generator ctx is NULL", K(ret));
+    }
+  }
+
+  if (OB_SUCC(ret)) {
+    ObDatum *limit_datum = NULL;
+    if (OB_UNLIKELY(1 != expr.arg_cnt_)) {
+      ret = OB_ERR_UNEXPECTED;
+      LOG_WARN("unexpected arg_cnt", K(ret), K(expr.arg_cnt_));
+    } else if (OB_FAIL(expr.eval_param_value(ctx, limit_datum))) {
+      LOG_WARN("expr.eval_param_value failed", K(ret));
+    } else if (OB_UNLIKELY(limit_datum->is_null())) {
+      ret = OB_INVALID_ARGUMENT;
+      LOG_USER_ERROR(OB_INVALID_ARGUMENT, "generator function. The argument should be an integer.");
+    } else {
+      int64_t	limit = limit_datum->get_int();
+      int64_t next_value_res = (++generator_ctx->curr_value_);
+      if (OB_UNLIKELY(next_value_res > limit)) {
+        ret = OB_ITER_END;
+      } else {
+        res_datum.set_int(next_value_res);
+      }
+    }
+  }
+  return ret;
+}
+
+int ObExprGeneratorFunc::cg_expr(ObExprCGCtx &expr_cg_ctx,
+                             const ObRawExpr &raw_expr,
+                             ObExpr &rt_expr) const
+{
+  int ret = OB_SUCCESS;
+  UNUSED(expr_cg_ctx);
+  if (OB_UNLIKELY(1 != raw_expr.get_param_count())) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid param count for in expr", K(ret));
+  } else if (OB_ISNULL(raw_expr.get_param_expr(0))) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid null param expr", K(ret));
+  } else if (!raw_expr.get_param_expr(0)->is_const_expr()) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_USER_ERROR(OB_INVALID_ARGUMENT, "generator function. The argument should be a constant integer");
+  }
+  rt_expr.eval_func_ = ObExprGeneratorFunc::eval_next_value;
+  return ret;
+}
+
+} /* namespace sql */
+} /* namespace oceanbase */