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#pragma clang system_header
// 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.
#pragma once
#include <memory>
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/csv/converter.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/csv/options.h"
#include "contrib/libs/apache/arrow_next/cpp/src/arrow/util/logging.h"
namespace arrow20 {
namespace csv {
enum class InferKind {
Null,
Integer,
Boolean,
Real,
Date,
Time,
Timestamp,
TimestampNS,
TimestampWithZone,
TimestampWithZoneNS,
TextDict,
BinaryDict,
Text,
Binary
};
class InferStatus {
public:
explicit InferStatus(const ConvertOptions& options)
: kind_(InferKind::Null), can_loosen_type_(true), options_(options) {}
InferKind kind() const { return kind_; }
bool can_loosen_type() const { return can_loosen_type_; }
void LoosenType(const Status& conversion_error) {
DCHECK(can_loosen_type_);
switch (kind_) {
case InferKind::Null:
return SetKind(InferKind::Integer);
case InferKind::Integer:
return SetKind(InferKind::Boolean);
case InferKind::Boolean:
return SetKind(InferKind::Date);
case InferKind::Date:
return SetKind(InferKind::Time);
case InferKind::Time:
return SetKind(InferKind::Timestamp);
case InferKind::Timestamp:
return SetKind(InferKind::TimestampNS);
case InferKind::TimestampNS:
return SetKind(InferKind::TimestampWithZone);
case InferKind::TimestampWithZone:
return SetKind(InferKind::TimestampWithZoneNS);
case InferKind::TimestampWithZoneNS:
return SetKind(InferKind::Real);
case InferKind::Real:
if (options_.auto_dict_encode) {
return SetKind(InferKind::TextDict);
} else {
return SetKind(InferKind::Text);
}
case InferKind::TextDict:
if (conversion_error.IsIndexError()) {
// Cardinality too large, fall back to non-dict encoding
return SetKind(InferKind::Text);
} else {
// Assuming UTF8 validation failure
return SetKind(InferKind::BinaryDict);
}
break;
case InferKind::BinaryDict:
// Assuming cardinality too large
return SetKind(InferKind::Binary);
case InferKind::Text:
// Assuming UTF8 validation failure
return SetKind(InferKind::Binary);
default:
ARROW_LOG(FATAL) << "Shouldn't come here";
}
}
Result<std::shared_ptr<Converter>> MakeConverter(MemoryPool* pool) {
auto make_converter =
[&](std::shared_ptr<DataType> type) -> Result<std::shared_ptr<Converter>> {
return Converter::Make(type, options_, pool);
};
auto make_dict_converter =
[&](std::shared_ptr<DataType> type) -> Result<std::shared_ptr<Converter>> {
ARROW_ASSIGN_OR_RAISE(auto dict_converter,
DictionaryConverter::Make(type, options_, pool));
dict_converter->SetMaxCardinality(options_.auto_dict_max_cardinality);
return dict_converter;
};
switch (kind_) {
case InferKind::Null:
return make_converter(null());
case InferKind::Integer:
return make_converter(int64());
case InferKind::Boolean:
return make_converter(boolean());
case InferKind::Date:
return make_converter(date32());
case InferKind::Time:
return make_converter(time32(TimeUnit::SECOND));
case InferKind::Timestamp:
return make_converter(timestamp(TimeUnit::SECOND));
case InferKind::TimestampNS:
return make_converter(timestamp(TimeUnit::NANO));
case InferKind::TimestampWithZone:
return make_converter(timestamp(TimeUnit::SECOND, "UTC"));
case InferKind::TimestampWithZoneNS:
return make_converter(timestamp(TimeUnit::NANO, "UTC"));
case InferKind::Real:
return make_converter(float64());
case InferKind::Text:
return make_converter(utf8());
case InferKind::Binary:
return make_converter(binary());
case InferKind::TextDict:
return make_dict_converter(utf8());
case InferKind::BinaryDict:
return make_dict_converter(binary());
}
return Status::UnknownError("Shouldn't come here");
}
protected:
void SetKind(InferKind kind) {
kind_ = kind;
if (kind == InferKind::Binary) {
// Binary is the catch-all type
can_loosen_type_ = false;
}
}
InferKind kind_;
bool can_loosen_type_;
const ConvertOptions& options_;
};
} // namespace csv
} // namespace arrow20
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