mirror of
https://github.com/dolthub/dolt.git
synced 2026-04-23 21:59:01 -05:00
Zach Musgrave
115 lines
3.1 KiB
Go
115 lines
3.1 KiB
Go
// Copyright 2019 Dolthub, 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 table
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import (
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"context"
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"errors"
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"io"
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"github.com/dolthub/dolt/go/libraries/doltcore/doltdb"
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"github.com/dolthub/dolt/go/libraries/doltcore/row"
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"github.com/dolthub/dolt/go/libraries/doltcore/schema"
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"github.com/dolthub/dolt/go/store/types"
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)
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// GetRow returns a row from |tbl| corresponding to |key| if it exists.
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func GetRow(ctx context.Context, tbl *doltdb.Table, sch schema.Schema, key types.Tuple) (r row.Row, ok bool, err error) {
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rowMap, err := tbl.GetNomsRowData(ctx)
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if err != nil {
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return nil, false, err
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}
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var fields types.Value
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fields, ok, err = rowMap.MaybeGet(ctx, key)
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if err != nil || !ok {
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return nil, ok, err
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}
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r, err = row.FromNoms(sch, key, fields.(types.Tuple))
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return
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}
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// PipeRows will read a row from given TableReader and write it to the provided RowWriter. It will do this
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// for every row until the TableReader's ReadRow method returns io.EOF or encounters an error in either reading
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// or writing. The caller will need to handle closing the tables as necessary. If contOnBadRow is true, errors reading
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// or writing will be ignored and the pipe operation will continue.
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//
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// Returns a tuple: (number of rows written, number of errors ignored, error). In the case that err is non-nil, the
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// row counter fields in the tuple will be set to -1.
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func PipeRows(ctx context.Context, rd Reader, wr RowWriter, contOnBadRow bool) (int, int, error) {
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var numBad, numGood int
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for {
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r, err := rd.ReadRow(ctx)
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if err != nil && err != io.EOF {
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if IsBadRow(err) && contOnBadRow {
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numBad++
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continue
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}
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return -1, -1, err
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} else if err == io.EOF && r == nil {
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break
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} else if r == nil {
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// row equal to nil should
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return -1, -1, errors.New("reader returned nil row with err==nil")
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}
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err = wr.WriteRow(ctx, r)
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if err != nil {
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return -1, -1, err
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} else {
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numGood++
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}
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}
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return numGood, numBad, nil
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}
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// ReadAllRows reads all rows from a TableReader and returns a slice containing those rows. Usually this is used
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// for testing, or with very small data sets.
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func ReadAllRows(ctx context.Context, rd Reader, contOnBadRow bool) ([]row.Row, int, error) {
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var rows []row.Row
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var err error
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badRowCount := 0
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for {
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var r row.Row
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r, err = rd.ReadRow(ctx)
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if err != nil && err != io.EOF || r == nil {
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if IsBadRow(err) {
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badRowCount++
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if contOnBadRow {
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continue
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}
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}
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break
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}
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rows = append(rows, r)
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}
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if err == nil || err == io.EOF {
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return rows, badRowCount, nil
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}
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return nil, badRowCount, err
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}
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