zeroshade commented on a change in pull request #10071: URL: https://github.com/apache/arrow/pull/10071#discussion_r619923902
########## File path: go/parquet/schema/reflection.go ########## @@ -0,0 +1,791 @@ +// 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 +} + +func typeToNode(name string, typ reflect.Type, repType parquet.Repetition, info *taggedInfo) Node { Review comment: added comments to the function and the rest of the function body -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected]
