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#include <Processors/Formats/Impl/JSONAsStringRowInputFormat.h>
#include <Formats/JSONUtils.h>
#include <DataTypes/DataTypeNullable.h>
#include <DataTypes/DataTypeLowCardinality.h>
#include <base/find_symbols.h>
#include <IO/ReadHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int BAD_ARGUMENTS;
extern const int INCORRECT_DATA;
extern const int ILLEGAL_COLUMN;
}
JSONAsRowInputFormat::JSONAsRowInputFormat(const Block & header_, ReadBuffer & in_, Params params_, const FormatSettings & format_settings_)
: JSONAsRowInputFormat(header_, std::make_unique<PeekableReadBuffer>(in_), params_, format_settings_) {}
JSONAsRowInputFormat::JSONAsRowInputFormat(const Block & header_, std::unique_ptr<PeekableReadBuffer> buf_, Params params_, const FormatSettings & format_settings_) :
JSONEachRowRowInputFormat(*buf_, header_, std::move(params_), format_settings_, false), buf(std::move(buf_))
{
if (header_.columns() > 1)
throw Exception(ErrorCodes::BAD_ARGUMENTS,
"This input format is only suitable for tables with a single column of type String or Object, but the number of columns is {}",
header_.columns());
}
void JSONAsRowInputFormat::resetParser()
{
JSONEachRowRowInputFormat::resetParser();
buf->reset();
}
bool JSONAsRowInputFormat::readRow(MutableColumns & columns, RowReadExtension &)
{
assert(columns.size() == 1);
assert(serializations.size() == 1);
if (!allow_new_rows)
return false;
skipWhitespaceIfAny(*buf);
if (!buf->eof())
{
if (!data_in_square_brackets && *buf->position() == ';')
{
/// ';' means the end of query, but it cannot be before ']'.
return allow_new_rows = false;
}
else if (data_in_square_brackets && *buf->position() == ']')
{
/// ']' means the end of query.
return allow_new_rows = false;
}
}
if (!buf->eof())
readJSONObject(*columns[0]);
skipWhitespaceIfAny(*buf);
if (!buf->eof() && *buf->position() == ',')
++buf->position();
skipWhitespaceIfAny(*buf);
return !buf->eof();
}
void JSONAsRowInputFormat::setReadBuffer(ReadBuffer & in_)
{
buf->setSubBuffer(in_);
}
JSONAsStringRowInputFormat::JSONAsStringRowInputFormat(
const Block & header_, ReadBuffer & in_, Params params_, const FormatSettings & format_settings_)
: JSONAsRowInputFormat(header_, in_, params_, format_settings_)
{
if (!isString(removeNullable(removeLowCardinality(header_.getByPosition(0).type))))
throw Exception(ErrorCodes::BAD_ARGUMENTS,
"This input format is only suitable for tables with a single column of type String but the column type is {}",
header_.getByPosition(0).type->getName());
}
void JSONAsStringRowInputFormat::readJSONObject(IColumn & column)
{
PeekableReadBufferCheckpoint checkpoint{*buf};
size_t balance = 0;
bool quotes = false;
if (*buf->position() != '{')
throw Exception(ErrorCodes::INCORRECT_DATA, "JSON object must begin with '{'.");
++buf->position();
++balance;
char * pos;
while (balance)
{
if (buf->eof())
throw Exception(ErrorCodes::INCORRECT_DATA, "Unexpected end of file while parsing JSON object.");
if (quotes)
{
pos = find_first_symbols<'"', '\\'>(buf->position(), buf->buffer().end());
buf->position() = pos;
if (buf->position() == buf->buffer().end())
continue;
if (*buf->position() == '"')
{
quotes = false;
++buf->position();
}
else if (*buf->position() == '\\')
{
++buf->position();
if (!buf->eof())
{
++buf->position();
}
}
}
else
{
pos = find_first_symbols<'"', '{', '}', '\\'>(buf->position(), buf->buffer().end());
buf->position() = pos;
if (buf->position() == buf->buffer().end())
continue;
if (*buf->position() == '{')
{
++balance;
++buf->position();
}
else if (*buf->position() == '}')
{
--balance;
++buf->position();
}
else if (*buf->position() == '\\')
{
++buf->position();
if (!buf->eof())
{
++buf->position();
}
}
else if (*buf->position() == '"')
{
quotes = true;
++buf->position();
}
}
}
buf->makeContinuousMemoryFromCheckpointToPos();
char * end = buf->position();
buf->rollbackToCheckpoint();
column.insertData(buf->position(), end - buf->position());
buf->position() = end;
}
JSONAsObjectRowInputFormat::JSONAsObjectRowInputFormat(
const Block & header_, ReadBuffer & in_, Params params_, const FormatSettings & format_settings_)
: JSONAsRowInputFormat(header_, in_, params_, format_settings_)
{
if (!isObject(header_.getByPosition(0).type))
throw Exception(ErrorCodes::BAD_ARGUMENTS,
"Input format JSONAsObject is only suitable for tables with a single column of type Object but the column type is {}",
header_.getByPosition(0).type->getName());
}
void JSONAsObjectRowInputFormat::readJSONObject(IColumn & column)
{
serializations[0]->deserializeTextJSON(column, *buf, format_settings);
}
Chunk JSONAsObjectRowInputFormat::getChunkForCount(size_t rows)
{
auto object_type = getPort().getHeader().getDataTypes()[0];
ColumnPtr column = object_type->createColumnConst(rows, Field(Object()));
return Chunk({std::move(column)}, rows);
}
JSONAsObjectExternalSchemaReader::JSONAsObjectExternalSchemaReader(const FormatSettings & settings)
{
if (!settings.json.allow_object_type)
throw Exception(
ErrorCodes::ILLEGAL_COLUMN,
"Cannot infer the data structure in JSONAsObject format because experimental Object type is not allowed. Set setting "
"allow_experimental_object_type = 1 in order to allow it");
}
void registerInputFormatJSONAsString(FormatFactory & factory)
{
factory.registerInputFormat("JSONAsString", [](
ReadBuffer & buf,
const Block & sample,
const RowInputFormatParams & params,
const FormatSettings & format_settings)
{
return std::make_shared<JSONAsStringRowInputFormat>(sample, buf, params, format_settings);
});
}
void registerFileSegmentationEngineJSONAsString(FormatFactory & factory)
{
factory.registerFileSegmentationEngine("JSONAsString", &JSONUtils::fileSegmentationEngineJSONEachRow);
}
void registerNonTrivialPrefixAndSuffixCheckerJSONAsString(FormatFactory & factory)
{
factory.registerNonTrivialPrefixAndSuffixChecker("JSONAsString", JSONUtils::nonTrivialPrefixAndSuffixCheckerJSONEachRowImpl);
}
void registerJSONAsStringSchemaReader(FormatFactory & factory)
{
factory.registerExternalSchemaReader("JSONAsString", [](const FormatSettings &)
{
return std::make_shared<JSONAsStringExternalSchemaReader>();
});
}
void registerInputFormatJSONAsObject(FormatFactory & factory)
{
factory.registerInputFormat("JSONAsObject", [](
ReadBuffer & buf,
const Block & sample,
IRowInputFormat::Params params,
const FormatSettings & settings)
{
return std::make_shared<JSONAsObjectRowInputFormat>(sample, buf, std::move(params), settings);
});
}
void registerNonTrivialPrefixAndSuffixCheckerJSONAsObject(FormatFactory & factory)
{
factory.registerNonTrivialPrefixAndSuffixChecker("JSONAsObject", JSONUtils::nonTrivialPrefixAndSuffixCheckerJSONEachRowImpl);
}
void registerFileSegmentationEngineJSONAsObject(FormatFactory & factory)
{
factory.registerFileSegmentationEngine("JSONAsObject", &JSONUtils::fileSegmentationEngineJSONEachRow);
}
void registerJSONAsObjectSchemaReader(FormatFactory & factory)
{
factory.registerExternalSchemaReader("JSONAsObject", [](const FormatSettings & settings)
{
return std::make_shared<JSONAsObjectExternalSchemaReader>(settings);
});
}
}
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