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package schema
import (
"fmt"
"github.com/seaweedfs/seaweedfs/weed/pb/schema_pb"
)
type ParquetLevels struct {
startColumnIndex int
endColumnIndex int
definitionDepth int
levels map[string]*ParquetLevels
}
func ToParquetLevels(recordType *schema_pb.RecordType) (*ParquetLevels, error) {
return toRecordTypeLevels(recordType, 0, 0)
}
func toFieldTypeLevels(fieldType *schema_pb.Type, startColumnIndex, definitionDepth int) (*ParquetLevels, error) {
switch fieldType.Kind.(type) {
case *schema_pb.Type_ScalarType:
return toFieldTypeScalarLevels(fieldType.GetScalarType(), startColumnIndex, definitionDepth)
case *schema_pb.Type_RecordType:
return toRecordTypeLevels(fieldType.GetRecordType(), startColumnIndex, definitionDepth)
case *schema_pb.Type_ListType:
return toFieldTypeListLevels(fieldType.GetListType(), startColumnIndex, definitionDepth)
}
return nil, fmt.Errorf("unknown field type: %T", fieldType.Kind)
}
func toFieldTypeListLevels(listType *schema_pb.ListType, startColumnIndex, definitionDepth int) (*ParquetLevels, error) {
return toFieldTypeLevels(listType.ElementType, startColumnIndex, definitionDepth)
}
func toFieldTypeScalarLevels(scalarType schema_pb.ScalarType, startColumnIndex, definitionDepth int) (*ParquetLevels, error) {
return &ParquetLevels{
startColumnIndex: startColumnIndex,
endColumnIndex: startColumnIndex + 1,
definitionDepth: definitionDepth,
}, nil
}
func toRecordTypeLevels(recordType *schema_pb.RecordType, startColumnIndex, definitionDepth int) (*ParquetLevels, error) {
recordTypeLevels := &ParquetLevels{
startColumnIndex: startColumnIndex,
definitionDepth: definitionDepth,
levels: make(map[string]*ParquetLevels),
}
for _, field := range recordType.Fields {
fieldTypeLevels, err := toFieldTypeLevels(field.Type, startColumnIndex, definitionDepth+1)
if err != nil {
return nil, err
}
recordTypeLevels.levels[field.Name] = fieldTypeLevels
startColumnIndex = fieldTypeLevels.endColumnIndex
}
recordTypeLevels.endColumnIndex = startColumnIndex
return recordTypeLevels, nil
}
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