Function ColumnInfos2ColumnsAndNames

pkg/expression/expression.go:1070–1125

ColumnInfos2ColumnsAndNames converts the ColumnInfo to the *Column and NameSlice.

(ctx BuildContext, dbName, tblName pmodel.CIStr, colInfos []*model.ColumnInfo, tblInfo *model.TableInfo)

// ColumnInfos2ColumnsAndNames converts the ColumnInfo to the *Column and NameSlice.
func ColumnInfos2ColumnsAndNames(ctx BuildContext, dbName, tblName pmodel.CIStr, colInfos []*model.ColumnInfo, tblInfo *model.TableInfo) ([]*Column, types.NameSlice, error) {
	columns := make([]*Column, 0, len(colInfos))
	names := make([]*types.FieldName, 0, len(colInfos))
	for i, col := range colInfos {
		names = append(names, &types.FieldName{
			OrigTblName: tblName,
			OrigColName: col.Name,
			DBName:      dbName,
			TblName:     tblName,
			ColName:     col.Name,
		})
		newCol := &Column{
			RetType:  col.FieldType.Clone(),
			ID:       col.ID,
			UniqueID: ctx.AllocPlanColumnID(),
			Index:    col.Offset,
			OrigName: names[i].String(),
			IsHidden: col.Hidden,
		}
		columns = append(columns, newCol)
	}
	// Resolve virtual generated column.
	mockSchema := NewSchema(columns...)

	truncateIgnored := false
	for i, col := range colInfos {
		if col.IsVirtualGenerated() {
			if !truncateIgnored {
				// Ignore redundant warning here.
				ctx = exprctx.CtxWithHandleTruncateErrLevel(ctx, errctx.LevelIgnore)
				truncateIgnored = true
			}

			expr, err := generatedexpr.ParseExpression(col.GeneratedExprString)
			if err != nil {
				return nil, nil, errors.Trace(err)
			}
			expr, err = generatedexpr.SimpleResolveName(expr, tblInfo)
			if err != nil {
				return nil, nil, errors.Trace(err)
			}
			e, err := BuildSimpleExpr(ctx, expr, WithInputSchemaAndNames(mockSchema, names, tblInfo), WithAllowCastArray(true))
			if err != nil {
				return nil, nil, errors.Trace(err)
			}
			if e != nil {
				columns[i].VirtualExpr = e.Clone()
			}
			columns[i].VirtualExpr, err = columns[i].VirtualExpr.ResolveIndices(mockSchema)
			if err != nil {
				return nil, nil, errors.Trace(err)
			}
		}
	}
	return columns, names, nil
}

// NewValuesFunc creates a new values function.