zeroshade commented on a change in pull request #10071: URL: https://github.com/apache/arrow/pull/10071#discussion_r633676933
########## File path: go/parquet/schema/reflection.go ########## @@ -0,0 +1,827 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package schema + +import ( + "reflect" + "strconv" + "strings" + + "github.com/apache/arrow/go/parquet" + format "github.com/apache/arrow/go/parquet/internal/gen-go/parquet" + "golang.org/x/xerrors" +) + +type taggedInfo struct { + Name string + + Type parquet.Type + KeyType parquet.Type + ValueType parquet.Type + + Length int32 + KeyLength int32 + ValueLength int32 + + Scale int32 + KeyScale int32 + ValueScale int32 + + Precision int32 + KeyPrecision int32 + ValuePrecision int32 + + FieldID int32 + KeyFieldID int32 + ValueFieldID int32 + + RepetitionType parquet.Repetition + ValueRepetition parquet.Repetition + + Converted ConvertedType + KeyConverted ConvertedType + ValueConverted ConvertedType + + LogicalFields map[string]string + KeyLogicalFields map[string]string + ValueLogicalFields map[string]string + + LogicalType LogicalType + KeyLogicalType LogicalType + ValueLogicalType LogicalType +} + +func (t *taggedInfo) CopyForKey() (ret taggedInfo) { + ret = *t + ret.Type = t.KeyType + ret.Length = t.KeyLength + ret.Scale = t.KeyScale + ret.Precision = t.KeyPrecision + ret.FieldID = t.KeyFieldID + ret.RepetitionType = parquet.Repetitions.Required + ret.Converted = t.KeyConverted + ret.LogicalType = t.KeyLogicalType + return +} + +func (t *taggedInfo) CopyForValue() (ret taggedInfo) { + ret = *t + ret.Type = t.ValueType + ret.Length = t.ValueLength + ret.Scale = t.ValueScale + ret.Precision = t.ValuePrecision + ret.FieldID = t.ValueFieldID + ret.RepetitionType = t.ValueRepetition + ret.Converted = t.ValueConverted + ret.LogicalType = t.ValueLogicalType + return +} + +func (t *taggedInfo) UpdateLogicalTypes() { + processLogicalType := func(fields map[string]string, precision, scale int32) LogicalType { + t, ok := fields["type"] + if !ok { + return NoLogicalType{} + } + + switch strings.ToLower(t) { + case "string": + return StringLogicalType{} + case "map": + return MapLogicalType{} + case "list": + return ListLogicalType{} + case "enum": + return EnumLogicalType{} + case "decimal": + if v, ok := fields["precision"]; ok { + precision = int32FromType(v) + } + if v, ok := fields["scale"]; ok { + scale = int32FromType(v) + } + return NewDecimalLogicalType(precision, scale) + case "date": + return DateLogicalType{} + case "time": + unit, ok := fields["unit"] + if !ok { + panic("must specify unit for time logical type") + } + adjustedToUtc, ok := fields["isadjustedutc"] + if !ok { + adjustedToUtc = "true" + } + return NewTimeLogicalType(boolFromStr(adjustedToUtc), timeUnitFromString(strings.ToLower(unit))) + case "timestamp": + unit, ok := fields["unit"] + if !ok { + panic("must specify unit for time logical type") + } + adjustedToUtc, ok := fields["isadjustedutc"] + if !ok { + adjustedToUtc = "true" + } + return NewTimestampLogicalType(boolFromStr(adjustedToUtc), timeUnitFromString(unit)) + case "integer": + width, ok := fields["bitwidth"] + if !ok { + panic("must specify bitwidth if explicitly setting integer logical type") + } + signed, ok := fields["signed"] + if !ok { + signed = "true" + } + + return NewIntLogicalType(int8(int32FromType(width)), boolFromStr(signed)) + case "null": + return NullLogicalType{} + case "json": + return JSONLogicalType{} + case "bson": + return BSONLogicalType{} + case "uuid": + return UUIDLogicalType{} + default: + panic(xerrors.Errorf("invalid logical type specified: %s", t)) + } + } + + t.LogicalType = processLogicalType(t.LogicalFields, t.Precision, t.Scale) + t.KeyLogicalType = processLogicalType(t.KeyLogicalFields, t.KeyPrecision, t.KeyScale) + t.ValueLogicalType = processLogicalType(t.ValueLogicalFields, t.ValuePrecision, t.ValueScale) +} + +func newTaggedInfo() taggedInfo { + return taggedInfo{ + Type: parquet.Types.Undefined, + KeyType: parquet.Types.Undefined, + ValueType: parquet.Types.Undefined, + RepetitionType: parquet.Repetitions.Undefined, + ValueRepetition: parquet.Repetitions.Undefined, + Converted: ConvertedTypes.NA, + KeyConverted: ConvertedTypes.NA, + ValueConverted: ConvertedTypes.NA, + FieldID: -1, + KeyFieldID: -1, + ValueFieldID: -1, + LogicalFields: make(map[string]string), + KeyLogicalFields: make(map[string]string), + ValueLogicalFields: make(map[string]string), + LogicalType: NoLogicalType{}, + KeyLogicalType: NoLogicalType{}, + ValueLogicalType: NoLogicalType{}, + } +} + +var int32FromType = func(v string) int32 { + val, err := strconv.Atoi(v) + if err != nil { + panic(err) + } + return int32(val) +} + +var boolFromStr = func(v string) bool { + val, err := strconv.ParseBool(v) + if err != nil { + panic(err) + } + return val +} + +func infoFromTags(f reflect.StructTag) *taggedInfo { + typeFromStr := func(v string) parquet.Type { + t, err := format.TypeFromString(strings.ToUpper(v)) + if err != nil { + panic(xerrors.Errorf("invalid type specified: %s", v)) + } + return parquet.Type(t) + } + + repFromStr := func(v string) parquet.Repetition { + r, err := format.FieldRepetitionTypeFromString(strings.ToUpper(v)) + if err != nil { + panic(err) + } + return parquet.Repetition(r) + } + + convertedFromStr := func(v string) ConvertedType { + c, err := format.ConvertedTypeFromString(strings.ToUpper(v)) + if err != nil { + panic(err) + } + return ConvertedType(c) + } + + if ptags, ok := f.Lookup("parquet"); ok { + info := newTaggedInfo() + for _, tag := range strings.Split(strings.Replace(ptags, "\t", "", -1), ",") { + tag = strings.TrimSpace(tag) + kv := strings.SplitN(tag, "=", 2) + key := strings.TrimSpace(strings.ToLower(kv[0])) + value := strings.TrimSpace(kv[1]) + + switch key { + case "name": + info.Name = value + case "type": + info.Type = typeFromStr(value) + case "keytype": + info.KeyType = typeFromStr(value) + case "valuetype": + info.ValueType = typeFromStr(value) + case "length": + info.Length = int32FromType(value) + case "keylength": + info.KeyLength = int32FromType(value) + case "valuelength": + info.ValueLength = int32FromType(value) + case "scale": + info.Scale = int32FromType(value) + case "keyscale": + info.KeyScale = int32FromType(value) + case "valuescale": + info.ValueScale = int32FromType(value) + case "precision": + info.Precision = int32FromType(value) + case "keyprecision": + info.KeyPrecision = int32FromType(value) + case "valueprecision": + info.ValuePrecision = int32FromType(value) + case "fieldid": + info.FieldID = int32FromType(value) + case "keyfieldid": + info.KeyFieldID = int32FromType(value) + case "valuefieldid": + info.ValueFieldID = int32FromType(value) + case "repetition": + info.RepetitionType = repFromStr(value) + case "valuerepetition": + info.ValueRepetition = repFromStr(value) + case "converted": + info.Converted = convertedFromStr(value) + case "keyconverted": + info.KeyConverted = convertedFromStr(value) + case "valueconverted": + info.ValueConverted = convertedFromStr(value) + case "logical": + info.LogicalFields["type"] = value + case "keylogical": + info.KeyLogicalFields["type"] = value + case "valuelogical": + info.ValueLogicalFields["type"] = value + default: + switch { + case strings.HasPrefix(key, "logical."): + info.LogicalFields[strings.TrimPrefix(key, "logical.")] = value + case strings.HasPrefix(key, "keylogical."): + info.KeyLogicalFields[strings.TrimPrefix(key, "keylogical.")] = value + case strings.HasPrefix(key, "valuelogical."): + info.ValueLogicalFields[strings.TrimPrefix(key, "valuelogical.")] = value + } + } + } + info.UpdateLogicalTypes() + return &info + } + return nil +} + +// typeToNode recurseively converts a physical type and the tag info into parquet Nodes +// +// to avoid having to propagate errors up potentially high numbers of recursive calls +// we use panics and then recover in the public function NewSchemaFromStruct so that a +// failure very far down the stack quickly unwinds. +func typeToNode(name string, typ reflect.Type, repType parquet.Repetition, info *taggedInfo) Node { + // set up our default values for everything + var ( + converted = ConvertedTypes.None + logical LogicalType = NoLogicalType{} + fieldID = int32(-1) + physical = parquet.Types.Undefined + typeLen = 0 + precision = 0 + scale = 0 + ) + if info != nil { // we have struct tag info to process + fieldID = info.FieldID Review comment: Should I modify this to no longer auto-generate the fieldIDs? is there a specific reason why the C++ code won't generate them anymore? -- This is an automated message from the Apache Git Service. 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