128 lines
3.3 KiB
C++
128 lines
3.3 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 <string.h>
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#include "sql/engine/expr/ob_expr_empty_lob.h"
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#include "sql/session/ob_sql_session_info.h"
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#include "objit/common/ob_item_type.h"
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#include "lib/oblog/ob_log.h"
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#include "sql/engine/expr/ob_expr_lob_utils.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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// empty_clob
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ObExprEmptyClob::ObExprEmptyClob(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_EMPTY_CLOB, N_EMPTY_CLOB, 0, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprEmptyClob::~ObExprEmptyClob()
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{
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}
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int ObExprEmptyClob::calc_result_type0(ObExprResType &type, ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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ObSessionNLSParams nls_param = type_ctx.get_session()->get_session_nls_params();
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type.set_clob();
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type.set_length(0);
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type.set_collation_level(CS_LEVEL_IMPLICIT);
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type.set_collation_type(nls_param.nls_collation_);
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return OB_SUCCESS;
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}
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int ObExprEmptyClob::eval_empty_clob(
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const ObExpr &expr,
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ObEvalCtx &ctx,
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ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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if (expr.obj_meta_.has_lob_header()) {
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ObTextStringDatumResult str_result(expr.datum_meta_.type_, &expr, &ctx, &expr_datum);
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if (OB_FAIL(str_result.init(0))) {
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LOG_WARN("init lob result failed");
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} else {
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str_result.set_result();
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}
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} else {
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expr_datum.set_string(NULL, 0);
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}
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return ret;
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}
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int ObExprEmptyClob::cg_expr(
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ObExprCGCtx &op_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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UNUSED(op_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = ObExprEmptyClob::eval_empty_clob;
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return OB_SUCCESS;
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}
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// empty_blob
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ObExprEmptyBlob::ObExprEmptyBlob(ObIAllocator &alloc)
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: ObFuncExprOperator(alloc, T_FUN_EMPTY_BLOB, N_EMPTY_BLOB, 0, VALID_FOR_GENERATED_COL, NOT_ROW_DIMENSION)
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{
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}
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ObExprEmptyBlob::~ObExprEmptyBlob()
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{
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}
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int ObExprEmptyBlob::calc_result_type0(ObExprResType &type, ObExprTypeCtx &type_ctx) const
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{
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UNUSED(type_ctx);
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type.set_blob();
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type.set_length(0);
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type.set_collation_type(CS_TYPE_BINARY);
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return OB_SUCCESS;
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}
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int ObExprEmptyBlob::eval_empty_blob(
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const ObExpr &expr,
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ObEvalCtx &ctx,
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ObDatum &expr_datum)
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{
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int ret = OB_SUCCESS;
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if (expr.obj_meta_.has_lob_header()) {
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ObTextStringDatumResult str_result(expr.datum_meta_.type_, &expr, &ctx, &expr_datum);
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if (OB_FAIL(str_result.init(0))) {
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LOG_WARN("init lob result failed");
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} else {
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str_result.set_result();
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}
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} else {
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expr_datum.set_string(NULL, 0);
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}
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return ret;
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}
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int ObExprEmptyBlob::cg_expr(
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ObExprCGCtx &op_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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UNUSED(op_cg_ctx);
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UNUSED(raw_expr);
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rt_expr.eval_func_ = ObExprEmptyBlob::eval_empty_blob;
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return OB_SUCCESS;
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}
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} // end of sql
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} // end of oceanbase
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