106 lines
3.5 KiB
C++
106 lines
3.5 KiB
C++
/**
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* Copyright (c) 2021 OceanBase
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* OceanBase CE is licensed under Mulan PubL v2.
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* You can use this software according to the terms and conditions of the Mulan PubL v2.
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* You may obtain a copy of Mulan PubL v2 at:
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* http://license.coscl.org.cn/MulanPubL-2.0
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* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
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* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
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* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
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* See the Mulan PubL v2 for more details.
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*/
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#define USING_LOG_PREFIX SQL_ENG
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#include "sql/engine/expr/ob_expr_generator_func.h"
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#include "sql/engine/ob_exec_context.h"
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namespace oceanbase
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{
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using namespace common;
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namespace sql
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{
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ObExprGeneratorFunc::ObExprGeneratorFunc(common::ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_SYS_GENERATOR, "generator", 1, NOT_VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprGeneratorFunc::~ObExprGeneratorFunc()
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{
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}
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int ObExprGeneratorFunc::calc_result_type1(ObExprResType &type,
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ObExprResType &limit,
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common::ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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int ret = OB_SUCCESS;
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limit.set_calc_type(ObIntType);
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type.set_int();
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return ret;
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}
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int ObExprGeneratorFunc::eval_next_value(const ObExpr &expr,
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ObEvalCtx &ctx,
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ObDatum &res_datum)
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{
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int ret = OB_SUCCESS;
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ObExprGeneratorFuncCtx *generator_ctx = NULL;
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uint64_t op_id = expr.expr_ctx_id_;
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ObExecContext &exec_ctx = ctx.exec_ctx_;
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if (OB_ISNULL(generator_ctx = static_cast<ObExprGeneratorFuncCtx *>(
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exec_ctx.get_expr_op_ctx(op_id)))) {
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if (OB_FAIL(exec_ctx.create_expr_op_ctx(op_id, generator_ctx))) {
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LOG_WARN("failed to create operator ctx", K(ret), K(op_id));
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} else if (OB_ISNULL(generator_ctx)) {
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ret = OB_ALLOCATE_MEMORY_FAILED;
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LOG_WARN("generator ctx is NULL", K(ret));
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}
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}
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if (OB_SUCC(ret)) {
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ObDatum *limit_datum = NULL;
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if (OB_UNLIKELY(1 != expr.arg_cnt_)) {
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ret = OB_ERR_UNEXPECTED;
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LOG_WARN("unexpected arg_cnt", K(ret), K(expr.arg_cnt_));
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} else if (OB_FAIL(expr.eval_param_value(ctx, limit_datum))) {
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LOG_WARN("expr.eval_param_value failed", K(ret));
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} else if (OB_UNLIKELY(limit_datum->is_null())) {
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ret = OB_INVALID_ARGUMENT;
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LOG_USER_ERROR(OB_INVALID_ARGUMENT, "generator function. The argument should be an integer.");
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} else {
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int64_t limit = limit_datum->get_int();
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int64_t next_value_res = (++generator_ctx->curr_value_);
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if (OB_UNLIKELY(next_value_res > limit)) {
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ret = OB_ITER_END;
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} else {
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res_datum.set_int(next_value_res);
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}
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}
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}
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return ret;
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}
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int ObExprGeneratorFunc::cg_expr(ObExprCGCtx &expr_cg_ctx,
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const ObRawExpr &raw_expr,
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ObExpr &rt_expr) const
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{
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int ret = OB_SUCCESS;
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UNUSED(expr_cg_ctx);
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if (OB_UNLIKELY(1 != raw_expr.get_param_count())) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid param count for in expr", K(ret));
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} else if (OB_ISNULL(raw_expr.get_param_expr(0))) {
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ret = OB_INVALID_ARGUMENT;
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LOG_WARN("invalid null param expr", K(ret));
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} else if (!raw_expr.get_param_expr(0)->is_const_expr()) {
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ret = OB_INVALID_ARGUMENT;
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LOG_USER_ERROR(OB_INVALID_ARGUMENT, "generator function. The argument should be a constant integer");
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}
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rt_expr.eval_func_ = ObExprGeneratorFunc::eval_next_value;
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return ret;
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}
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} /* namespace sql */
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} /* namespace oceanbase */
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