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126 lines
3.9 KiB
126 lines
3.9 KiB
/*
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* Minio Cloud Storage, (C) 2019 Minio, 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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*/
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package schema
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import (
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"fmt"
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"regexp"
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"strings"
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"github.com/minio/minio/pkg/s3select/internal/parquet-go/gen-go/parquet"
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)
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var nameRegexp = regexp.MustCompile("^[a-zA-Z0-9_]+$")
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func validataPathSegments(pathSegments []string) error {
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for _, pathSegment := range pathSegments {
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if !nameRegexp.MatchString(pathSegment) {
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return fmt.Errorf("unsupported name %v", strings.Join(pathSegments, "."))
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}
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}
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return nil
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}
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// Element - represents schema element and its children. Any element must have Name and RepetitionType fields set.
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type Element struct {
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parquet.SchemaElement
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numChildren int32
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Encoding *parquet.Encoding // Optional; defaults is computed.
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CompressionType *parquet.CompressionCodec // Optional; defaults to SNAPPY.
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Children *Tree
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MaxDefinitionLevel int64
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MaxRepetitionLevel int64
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PathInTree string
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PathInSchema string
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}
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// String - stringify this element.
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func (element *Element) String() string {
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var s []string
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s = append(s, "Name:"+element.Name)
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s = append(s, "RepetitionType:"+element.RepetitionType.String())
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if element.Type != nil {
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s = append(s, "Type:"+element.Type.String())
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}
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if element.ConvertedType != nil {
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s = append(s, "ConvertedType:"+element.ConvertedType.String())
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}
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if element.Encoding != nil {
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s = append(s, "Encoding:"+element.Encoding.String())
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}
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if element.CompressionType != nil {
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s = append(s, "CompressionType:"+element.CompressionType.String())
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}
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if element.Children != nil && element.Children.Length() > 0 {
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s = append(s, "Children:"+element.Children.String())
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}
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s = append(s, fmt.Sprintf("MaxDefinitionLevel:%v", element.MaxDefinitionLevel))
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s = append(s, fmt.Sprintf("MaxRepetitionLevel:%v", element.MaxRepetitionLevel))
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if element.PathInTree != "" {
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s = append(s, "PathInTree:"+element.PathInTree)
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}
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if element.PathInSchema != "" {
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s = append(s, "PathInSchema:"+element.PathInSchema)
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}
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return "{" + strings.Join(s, ", ") + "}"
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}
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// NewElement - creates new element.
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func NewElement(name string, repetitionType parquet.FieldRepetitionType,
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elementType *parquet.Type, convertedType *parquet.ConvertedType,
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encoding *parquet.Encoding, compressionType *parquet.CompressionCodec,
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children *Tree) (*Element, error) {
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if !nameRegexp.MatchString(name) {
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return nil, fmt.Errorf("unsupported name %v", name)
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}
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switch repetitionType {
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case parquet.FieldRepetitionType_REQUIRED, parquet.FieldRepetitionType_OPTIONAL, parquet.FieldRepetitionType_REPEATED:
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default:
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return nil, fmt.Errorf("unknown repetition type %v", repetitionType)
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}
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if repetitionType == parquet.FieldRepetitionType_REPEATED && (elementType != nil || convertedType != nil) {
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return nil, fmt.Errorf("repetition type REPEATED should be used in group element")
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}
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if children != nil && children.Length() != 0 {
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if elementType != nil {
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return nil, fmt.Errorf("type should be nil for group element")
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}
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}
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element := Element{
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Encoding: encoding,
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CompressionType: compressionType,
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Children: children,
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}
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element.Name = name
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element.RepetitionType = &repetitionType
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element.Type = elementType
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element.ConvertedType = convertedType
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element.NumChildren = &element.numChildren
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if element.Children != nil {
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element.numChildren = int32(element.Children.Length())
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}
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return &element, nil
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}
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