41 lines
1.6 KiB
Go
41 lines
1.6 KiB
Go
// Copyright 2024 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package resolve
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import (
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"github.com/pingcap/tidb/pkg/meta/model"
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pmodel "github.com/pingcap/tidb/pkg/parser/model"
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)
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// ResultField represents a result field which can be a column from a table,
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// or an expression in select field. It is a generated property during
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// binding process. ResultField is the key element to evaluate a ColumnNameExpr.
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// After resolving process, every ColumnNameExpr will be resolved to a ResultField.
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// During execution, every row retrieved from table will set the row value to
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// ResultFields of that table, so ColumnNameExpr resolved to that ResultField can be
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// easily evaluated.
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type ResultField struct {
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Column *model.ColumnInfo
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ColumnAsName pmodel.CIStr
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// EmptyOrgName indicates whether this field has an empty org_name. A field has an empty org name, if it's an
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// expression. It's not sure whether it's safe to use empty string in `.Column.Name`, so a new field is added to
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// indicate whether it's empty.
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EmptyOrgName bool
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Table *model.TableInfo
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TableAsName pmodel.CIStr
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DBName pmodel.CIStr
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}
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